Al2O3, TiO2 Castable Refractories

Magnesia-chrome refractory castable has excellent resistance to alkaline slag, which is widely used on continuous casting
and refining ladle purging.
In use, the bulk of the material discharges harmful ingredients Cr6 + and pollute the environment.
Thus, in recent years, people develop chromium-magnesia type refractory castable.
More successful one is magnesium zirconium refractory castable, here we introduced the titanium-containing magnesium aluminum refractory castable.
These materials are expected to replace the magnesia-chrome refractory castable.

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Magnesium aluminum titanium refractory castable is made with 95 fused magnesia for refractory aggregate,
the critical diameter is 5mm.
Refractory powder is made from 95 fused magnesia powder, calcined alumina powder and titanium dioxide powder 98,
Plus binders and dispersing agents. Weighing all kinds of raw materials mixing with water, processed by vibration molding
and nature conservation, and finally determine its performance.

 

The 1000 ℃, 1400 ℃ and 1600 ℃ after burning compressive strength are about 40MPa, 110MPa and 115MPa,
1600 ℃ after firing line change is about -0.82%.

 

LINKS: Zircon Brick | Magnesium Zircon Brick | High Alumina Brick | High Alumina Cement

Chromium Corundum Brick as fire brick

Main mineral composition of Chrome aluminum brick is α-Al2O3-Cr2O3 solid solution. Secondary mineral composition: a small amount of composite spinel (spinel or without compound), chromium oxide content of 1% to 30%.

 

Chorome bricks can be cast chromium corundum brick and fired brick. Under normal circumstances, chrome corundum bricks refer to sintering chrome corundum bricks.

 

Chrome aluminum brick

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At present, aluminum chrome bricks have a wider application, chrome corundum bricks made of chromium slag are widely used in zinc smelting furnace, the volatile kiln, chromium corundum brick has excellent thermal stability and high temperature creep vibration performance while meeting national recycling economy.

 

The main material of chromium corundum brick made by Jinshi Refractory are corundum and fused chromium oxide with powder and other additives. After kneading, shaping, drying, high temperature fired in shuttle kiln. The product has the characteristics of wear-resistant, anti thermal shock and acid erosion.

 

High chrome brick (Cr2O3≥90%) is mainly used at the key parts of kilns in coal chemical industry, chemical industry, E-glass fiber furnaces, waste incinerators, and other kiln; Chromium corundum brick is mainly used in carbon black furnace, copper smelting furnace lining, glass furnace bath, rolling furnace chute, tapping platform. Product dimensions, physical and chemical indicators and service life have reached or exceeded the level of similar products at home and abroad.

High Temperature Sintering Changes of Magnesium Carbon Refractory Castable

The strength of magnesium carbon refractory castable decreases as increasing of heating temperature.
Becasue at the test temperature Graphite suppression material also hindered the ceramic material combined.
Meanwhile, the linear expansion coefficient of magnesium and graphite vary widely, thermal stress is also large,
so that the two are separated, loose organizational structure, so the high temperature burning intensity decreased greatly.
To be noted that magnesium carbon refractory castable in long-term use at high temperatures,
the ceramic will be in conjunction with carbon, which can greatly improve the strength and slag resistance,
Application in the ladle slag lines and other thermal devices will be able to obtain satisfactory effect.

LINKS: Silicon Carbide Bricks | Silicon Carbide | Magnesium Aluminate Spinel | Refractory Castable

Fire-Resistant Ball

Refractory ball mainly takes industrial alumina and kaolin as the raw material, processed by reasonable ratio, forming and calcination, it has the following characteristics:

 

1, high mechanical strength, long life cycle;
2, excellent chemical stability, does not chemically react with the material;
3, high temperature performance, the maximum temperature can reach 1900 degrees.

 

Refractory ball can be common refractory and high-alumina refractory ball, the common ball is suitable for refractory sulfuric acid and fertilizer industry transformation and conversion furnace, high-alumina refractory ball is suitable for urea, steel and other industries stove, heating furnace and other equipment transformation.

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Use of Fire-Resistant Ball

 

Refractory ball for regenerative fertilizer plant is especially suitable for high-temperature shift converter, reformer, hydroconversion, a desulfurization tank and methanation furnace for dispering gas-liquid, support, cover and protect the catalyst.

 

Refractory ball can also be used for heating stove and the steel industry's conversion device. Refractory ball, also known as regenerative regenerator spherical having good thermal shock resistance, heat storage capacity, high strength, easy to clean, reusable and so on. Ball regenerative combustion system is suitable for gas and non-gas fuel industrial furnaces.

 

LINKS: Alumina Bubble Brick | Alumina Hollow Ball ｜Corundum Brick | Heat-Resistant Stainless Steel Fibers

Effect of Zircon Powder and Aluminum Powder Dosage on Thermal Shock Resistance

On the base of Zircon Powder amount (%) of 3,6, 9 and 12; and the Aluminum Powder amount (%) of 5, 10 and 15, the sample after 3h burning at 1600 ℃, then heating 1100 ℃ and air-cooled,and after 3 cycles the greater flexural strength value, the better the thermal shock resistance.

With the increase powder was added, the flexural strength retention rate gradually improve, indicating that thermal shock resistance is getting better. Because magnesium zirconium refractory castable is added with zircon powder at a high temperature to form a forsterite and ZrO2, ZrO2 has toughening effect and improved thermal shock resistance; In magnesium aluminum refractory castable, adding alumina powder, MA formed at high temperatures, because of the linear expansion coefficient differences between the MA and periclase, the two formed around the thermal stress generated when the micro-cracks and micro-contractile ring, which can prevent the spread of cracks and thermal shock absorbing material, thus improving the thermal shock resistance of the material.

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LINKS: Zircon Brick | Alumina Hollow Ball | α Alumina Powder | High Aluminum Powder | Aluminum Hydroxide

Corundum Dry Ramming Material

Corundum dry ramming material takes boron oxide as a sintering agent, as Al2O3 and B2O3 can form inconsistent molten compound
of 9Al2O3 and 2B2O3, the former melts decompose at 1035 ℃, the latter has melting point of 1965 ℃.
Eutectic temperature up to 1920 ℃ can be with good fire resistance. Using amount is usually less than 8%, the specific amount
shall be determined by experiment;
In addition, Al2O3-SiC-C dry vibration also use B2O3 as a sintering agent, which has no major impact on its performance.
Spinel dry ramming material commonly use Calcium aluminate material as a sintering agent with better effect.

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LINKS: Corundum Brick | Corundum Mullite Brick | Corundum Mullite Light Brick | White Corundum

Silicon Nitride Bonded Silicon Carbide

Silicon nitride bonded silicon carbide takes quartz, petroleum coke as raw materials, gouache, salt as auxiliary material, which are put into resistance furnace for temperature smelting.

 

Silicon nitride bonded silicon carbide can be black and green: Black silicon nitride bonded silicon carbide black or blue-black, green silicon nitride bonded silicon carbide green or blue-green. In the manufacturing process, the production of green silicon nitride bonded silicon carbide is characterized by the use of purer raw materials, charge added salt, it can promote the product green. Green silicon nitride bonded silicon carbide purity than black silicon nitride bonded silicon carbide. Silicon nitride bonded silicon carbide does not react with any acid, alkali oxides melt but can promote the decomposition of silicon nitride bonded silicon carbide.

 

Silicon nitride bonded silicon carbide does not react with any acid, alkali oxides melt but can promote the decomposition of silicon nitride bonded silicon carbide.

 

Black silicon nitride bonded silicon carbide and synthetic corundum abrasives compared with high hardness, brittleness, suitable for processing low tensile strength of the metal and non-metallic materials, such as gray cast iron, brass, non-ferrous metals such as lead, and ceramics, glass and other hard materials brittle material. Green silicon nitride bonded silicon carbide and silicon nitride bonded silicon carbide black compared to its purity, hardness, slightly brittle material suitable for processing hard and brittle, such as cemented carbide, glass, agate, also widely used measuring tools, cutting tools, molds grinding and aircraft, automobiles, shipbuilding and other engine cylinder honing.

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LINKS:　Silicon Carbide Bricks ｜Chrome Oxide Green ｜Chrome Brick ｜Silicon Carbide ｜Hercynite ｜Andalusite

Development of Refractory Castable without Stirring

Refractory castable without stirring is developed for blast furnace iron trough.
Refractory castable without stirring is stirring mixed in the refractories plant with good liquidity, which can be used directly to the ditch, after a short baking, it will be able to use.
Features: No on-site stirring, no pollution, free of cement and aluminum powder and other additives, direct casting, heat coagulation and fast drying, high strength and good corrosion resistance, it is more promising.
No stirring castable is developed on the basis of ultralow cement Al2O3-SiC-C refractory castable.
Due to changes in construction methods, materials itself has changed, mainly in: the use of materials such as phenolic resin and binding agent to adjust the particle size distribution and add preservative and drying agent to prevent material separation occurs during storage and transportation segregation, and can save 15 to 20 days.
No stirring sodium silicate Al2O3-SiC-C refractory castable hardening mechanism is: due to dehydration of sodium silicate and gradually form a gel and ultrafine cohesion and so on, with rising heating temperature, and cured and ultimately achieve ceramic bond.

 

LINKS: Bulk Refractories | Low Porosity Clay Brick | Heat-Resistant Stainless Steel Fibers | Sodium Tripolyphosphate | Refractory Castable

Corundum Stereotype Refractories

Abstract: Many kinds of corundum materials can be prepared as a monolithic refractory products and aggregate powder.

Depending on the binding agent and construction, Corundum refractory can be divided into the following categories:  

Corundum refractory castable: corundum, corundum - spinel, corundum -SiC-C quality

Corundum refractory plastic can: corundum, aggregate: all kinds of corundum; binding agent: sodium silicate, phosphate, organic binding agent.

Corundum refractory ramming material: corundum, aggregate: all kinds of corundum; binding agent: phosphoric acid, phosphate, etc.

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Corundum refractory mortar: for corundum refractory masonry joints

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Mullite Castable Technical Parameters

Mullite castable application: for large circulating fluidized bed boiler furnace, cyclones, return valve and positions of high flue gas velocity and high density solid velocity.

 

Mullite castable features: adopt high-quality corundum mullite aggregate, superfine powder, imported additives, with high compressive strength, excellent high temperature volume stability and thermal shock resistance, and excellent abrasion and erosion resistance.

 

Mullite castable Usage: Add water and stir into the mortar and casted.

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Mullite castable technical parameters:

 

1, chemical composition: (%) Al2O3≥92;
2, thermal conductivity: (W / m.k) 1200 ℃ hot surface ≤2.0;
3, Linear change: (%) 1350 ℃ × 3h ± 0.3;
4, Cold Crushing Strength: (MPa) 110 ℃ × 24h after drying> 55;
5, bulk density: (g / cm3) ≤3.0;
6, refractoriness: (℃) ≥1790;
7, Fe2O3≤0.5.

 

LINKS: Corundum Mullite Brick | Mullite, Sillimanite, Andalusite Brick | Corundum Mullite Light Brick | Mullite

Parameters of Alumina and Alumina Hollow Ball Insulation Bricks

Alumina insulation bricks are treated by foam insulation, casting molding and high temperature firing. Hollow ball alumina insulating bricks are made from melt blowing alumina hollow ball with compound binding agent and shaped by vibration, high temperature firing. Both of them have small thermal conductivity, high load softening temperature, less reheating linear change, which are widely used in insulation lining work or flame contact kiln and precision thermal equipment.
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Alumina insulation bricks

Technical Parameters:

Item	Alumina insulation bricks			Hollow ball alumina insulating bricks
Al2O3%	≥80	≥85	90	≥95	≥97	≥98
Fe2O3%	≤0.5	≤0.5	≤0.5	≤0.4	≤0.4	≤0.4
Bulk Density g/cm3	≤0.6	≤0.8	≤1.0	≤1.2	≤1.4	≤1.6
Cold crushing Mpa	≥2.0	≥3.0	≥4.0	≥3.0	≥10	≥12
Reheating Linear Change %1600℃×2h	≤0.5	≤0.5	≤0.5	≤0.4	≤0.4	≤0.4
Thermal Conductivity w/m 350℃	≤0.7	≤0.6	≤0.5	≤0.4	≤0.3	≤0.3
Maximum temperature ℃	1500	1550	1600	1600	1650	1700

LINKS: Alumina Bubble Brick | High Alumina Brick | Alumina Hollow Ball | Aluminum Powder | Aluminum Hydroxide

Role of Refractory Cement in Castable

Ladle refractory castable generally use CA-70 or CA-80 refractory cement as binder.
In a small ladle, using refractory cement as binder can reduce costs about 90%.
The main role of refractory cement is to provide the refractory castable construction strength and low strength at high temperatures。
Because of Al2O3 and CaO forming CA6 and CA2 and other refractory minerals, it helps to improve its performance.
However, the cement itself is with impurities and excessive formation of CA6,which is disadvantageous for its refractory castable.
So we need to consider its properties regarding to the use amount.

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LINKS: Bulk Refractories | High Alumina Cement |  Refractory Castable | High Aluminum Powder | Alumina Hollow Ball

Silicon Carbide Particle Sizes

1. Particles: Geometry with a specific shape within a range of sizes. Here, the size is generally between a millimeter to nanometer.
And particles not only refers to solid particles, as well as droplets, oil droplets and other liquid particles.

Silicon carbide

2. Hugh powder: Particles consists by a large number of different sizes.
3. Particle size: the size of the particles is called the size of the particles.
4. Particle size distribution: particles of different size and with a specific instrument approach reflects the percentage of the total powder.
There are 2 forms interval distribution and cumulative distribution.
Interval distribution, also known as differential distribution or frequency distribution, which represents the percentage of a series of particle size range of particles.
Cumulative distribution, also known as distribution points, which represents less than or greater than a certain percentage of the particle size.

 

Silicon carbide (SiC) is made from quartz sand, petroleum coke (or coal), wood (it need to add salt for the production of green silicon carbide) and other raw materials. Silicon carbide is also known as Moissanite.

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LINKS: Silicon Carbide Bricks｜Silicon Carbide ｜Refractory Castable ｜Sodium Tripolyphosphate | Hexametaphosphate

Magnesia Dry Vibrated Materials

Magnesia Dry Vibrated Materials

Sintering agent of Magnesia dry vibrated materials is generally iron oxide. Thermal decomposition of iron oxide at a high temperature, high iron to shift from low-cost iron. In the presence of liquid iron, Fe2O3 will occur the following reaction:
Fe2O3 + Fe (L) = 3FeO
Or 2Fe (3 +) + Fe (L) = 3FeO (2+)
Fe2O3 melting point is 1576 ℃, and FeO melting point of 1355 ℃, therefore favor the formation of low-cost iron oxide phase, and is gradually absorbed magnesium calcite form a solid solution that is enriched's body [(Mg Fe) O].
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LINKS: Magnesium Chrome Zircon Brick | Hexametaphosphate | High Alumina Cement | Guangxi Pak Nai | Yellow Dextrin

Dry Vibration Material and Ramming Mixes

Short steelmaking process system （EAF - refining - continuous casting - continuous casting production model）will be the new production process of 21st century , steel production, the advantage of compact layout process, short production cycle, good quality single variety and high production efficiency .
Steelmaking generally use large, high power or ultra-high power electric furnace, eccentric bottom tapping, or high impedance DC power supply, while intensive smelting. Therefore, the refractory material put forward higher requirements, but also promoted the development of refractories. This class generally use water-cooled electric furnace wall and the lid, the lid triangle is high-purity corundum castable refractory, and furnace bottom slope that is melting tank with a dry vibration material and ramming material, also used when damaged repair of such material.

In the non-ferrous casting and industrial use frequency induction melting furnace and other parts of the ditch, dry vibration material can be made of aluminum lining, also made good use of effects.

Dry vibration material and ramming material a new varieties of monolithic refractories in recent 10 years. The key technology is self reaction in high temperature, self-sintered product must be high-temperature phase material, and particle size distribution and binding agent is very important. The material begins with the introduction of an electric furnace brought soon to localization. Factory 150t UHP EAF with Ogilvy & Mather, dry vibration material, the average life expectancy of 260 times, 305 times the highest level. When domestic wet vibration ramming mixes, the average life expectancy of 282 times, up to 332 times.

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Coal Chemical Chromium Corundum Brick

Product Description:

Main mineral composition of coal chemical chromium corundum brick is α-Al2O3-Cr2O3 solid solution. Secondary mineral composition are a small amount of composite spinel (spinel or without compound), chromium oxide content of 1% to 30%. Coal chemical chromium corundum brick can be cast chromium corundum brick and fired brick.

coal chemical chromium corundum brick

Coal chemical chromium corundum brick has broader applications. It can be chromium corundum brick made from chromium slag, which are widely used in zinc smelting furnace and volatile kiln. Chromium corundum brick has excellent thermal stability and high temperature creep vibration performance while meeting national recycling economy.

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Zirconia Hollow Ball Brick

Zirconia hollow ball brick takes fused zirconia hollow spheres as raw material, which is processed by molding and high temperature sintering. Zirconia hollow ball brick has the features of high temperature resistance (the highest temperature ≥2350 ℃), anti-acid corrosion, good insulation properties, high thermal stability.

Zirconia hollow ball brick

Zirconia hollow ball brick is widely used in non-metallic materials industry, petrochemical, iron and steel smelting, defense, electronics industry and other fields. For example, it can be used as silicon furnace lining in metallurgical industrial, hydrogen furnace in oil industry, high temperature insulation lining for gasifier apparatus, IF carbide furnace insulation lining.
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Sintered Mullite Brick

Mullite refractory bricks takes mullite (3Al2O3 · 2SiO2) as raw material. Alumina content is generally between 65% and 75%. In addition to the mullite, other mineral composition can be small amounts of glass phase and cristobalite with lower alumina contains; and a small amount of corundum with higher alumina containing. The mullite brick refractoriness can be up to 1790 ℃. Load softening starting temperature: 1600 ~ 1700 ℃. Cold crushing strength: 70 ~ 260MPa. Good thermal shock resistance.

Mullite refractory bricks

Sintered mullite brick takes high bauxite as the main raw material, which is added with a small amount of clay or raw bauxite as binder, processed by molding and firing.

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Sillimanite Brick

Sillimanite brick is a refractory brick made of sillimanite. After high temperature calcination, sillimanite turn into mullite and free silicon dioxide. Generally, Sillimanite brick is manufactured by high-temperature firing and mud casting.

The physical and chemical properties of sillimanite brick is better than that of high alumina bricks, with refractoriness 1770 ~ 1830 ℃, load softening starting point 1500 ~ 1650 ℃. Sillimanite bricks are mainly used for the formation of flow cavity of the glass chamber, blast furnace lining, furnace throat and ceramic industry kiln furniture.

Sillimanite brick

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Sintered White Corundum Bricks

The sintered white corundum bricks are made of imported corundum and high purity fused corundum, adopt advanced superfine powder adding technology. Sintered white corundum bricks are processed by mixing, molding, drying and firing in shuttle kiln.

sintered white corundum

Sintered White Corundum Bricks have the features of high refractoriness, good thermal shock stability, high temperature strength, excellent corrosion resistance, slag resistance, small expansion coefficient, low creep, anti-peeling, which is suitable for a variety of atmospheric conditions. Sintered White Corundum Bricks are widely used in high temperature sintering of zirconia ceramics, fluorescent materials, electronic ceramics, magnetic materials, ceramic powder and petrochemical industry gasifier, ammonia conversion furnace, carbon black reaction Furnace and glass industry, such as high-temperature furnace equipment.

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Acidic Refractories

Acidic refractories consist of mainly acidic materials like alumina (Al₂O₃) and silica (SiO₂)， which are generally not attacked or affected by acidic materials, but easily affected by basic materials. They include substances such as silica, alumina, and fire clay brick refractories. Notable reagents that can attack both alumina and silica are hydrofluoric acid, phosphoric acid, and fluorinated gases (e.g. HF, F2). At high temperatures, acidic refractories may also react with limes and basic oxides.

1. Alumina Bubble Refractory Brick
Alumina bubble brick adopts Alumina bubble as the main material, high-performance ultra-fine powder as additive and organic binder material. After forming and drying, the alumina bubble products are baked in shuttle kiln at 1750 ℃.

2. Micro Silica
Micro silica fume is a high activity pozzolanic material with large surface area. Micro silica in materials will play the role of lubrication with the tiny spherical body. Micro silica in the special refractories can form a multi-layer protective layer during oxide. It has good mechanical properties and resistance to high temperature and oxidation.

Links: Alumina Bubble Brick | High Alumina Brick | Silicon Carbide Bricks | High Alumina Cement |　Alumina Hollow Ball ｜Silicon Carbide

Black Silicon Carbide and Green Silicon Carbide

There are two basic varieties of Silicon carbide i.e. black silicon carbide and green silicon carbide, both of them are α-SiC

Silicon carbide

 

① Black silicon carbide contains about 98.5% of SiC, with toughness higher than that of green silicon carbide.
Black silicon carbide is mostly used for processing low tensile strength materials such as glass, ceramics, stone, refractories, cast iron and nonferrous metals.

 

② Green silicon carbide contains more than 99% of SiC, with good self sharpness. Green silicon carbide is mostly for processing carbide, titanium and optical glass,
but also for honing cylinder sets and high-speed steel grinding tool.

 

In addition, there are cubic silicon carbide, which is yellow-green crystal produced by special process, the abrasive is for bearings ultra-finishing,
reducing the surface roughness from Ra32 ~ 0.16 micron to Ra0.04 ~ 0.02 microns at a time.

 

 

LINKS:  Silicon Carbide Bricks | Silicon Carbide | Chrome Oxide Green | Hexametaphosphate | Heat-Resistant Stainless Steel Fibers | High Alumina Cement

Why Concrete Mixed with Silicon Powder

The particle size of the silicon powder is less than 1 μm with the average particle size 0.1 to 0.3 μm and the specific surface area is 20 to 28 m2 / g. Its fineness and specific surface area are of about 80 to 100 times than that of cement.

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Although HPC with compressive strength up to 100 MPa can be made with pure cement, it will be much easier when using silica fume. For the preparation of concrete strength of more than 100 MPa, the use of silicon powder is almost indispensable. Silica fume in the concrete at the same time from the filling material and volcanic ash material used. The use of silica fume greatly reduces the pore size in the hydrated slurry and improves the pore size distribution, thus increasing the strength and decreasing the permeability. For example, the results of the study (CEB2FIP1988) show that for cement to be 70 MPa concrete, the cement ratio is 0.35 for pure cement, and 0.50 for 8% silica. Because the silica fines are very fine, they can react with volcanic ash in the early hours. According to Carette and Malhotra (1992), the contribution of silica fume to concrete strength is mainly before 28 days. Therefore, the long-term strength growth, the general view that the silica fume concrete than pure cement concrete or fly ash concrete. Almad (1994) cited the results of the development of NSC strength by silica fume, which indicates that the increase in silica fume content leads to a decrease in early relative strength development. Sandvik 1992 also found this phenomenon in 65 MPa concrete.

However, despite the relatively early development of silica fume concrete at the same water / cement ratio than pure cement concrete, the strength of silica fume concrete is much higher than that of pure cement concrete, due to the addition of silica fume. On the other hand, experience has shown that the early strength development of HPC is faster than that of NSC, although the setting time of HPC may be slightly delayed, and the hydration after coagulation can be greatly accelerated by superplasticizers and silica fume. The result is usually a very rapid development of strength after condensation.

There are reports of compressive strength collapse for certain silica fume concrete specimens that have been dried or cured in the air at very low water / cement ratios (De Larrard and Aiticin 1993). This decrease in strength usually occurs after 90 days of age and is generally believed to be caused by internal self-drying and dry fractures. However, laboratory and field studies by many other researchers have shown that the late strength of HPC does not decrease. For example, all cores tested from six different HPC samples from 3 months to 3 years showed increased strength. Of course, the long-term strength growth potential of HPC is smaller than that of NSC.

LINKS: High Alumina Brick | Low Porosity Clay Brick | Micro Silica | Spherical Asphalt | Andalusite | Flake Graphite | Aluminum Hydroxide | Aluminum Powder | Kyanite | High Alumina Cement | Explosion-Proof Fiber

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Key Technology of New Repairing Material

New repair material is mainly used for the bottom of the converter, ventilation bricks, blocks of brick and skateboards and other parts of the hot and cold repair materials, gravity filler and joint materials. The technology is featured with high strength, easy Tanping, good sintering, and sometimes requires good ventilation. The tech each time needs less material, while the important parts get enough attention.

Performance of new repair materials

In the table, the number 1 is composed of first-grade fused magnesia, mid-grade magnesia and fused spinel as main materials, and fused white fused alumina powder and calcined alumina powder are added, and the organic and inorganic composite binders are added. 2 with two fused magnesia, mid-range magnesia and sintered spinel as the main material, adding a small amount of ultra-fine powder, but also with a composite binder and accelerator and explosion-proof agent; No. 3 and 4 with fused white corundum powder , Fused magnesia and superfine powder, and add binder and admixture, No. 5 with zircon instead of fused magnesia. No. 1 converter breathable brick magnesia repair material, No. 2-5, respectively, for the ladle ventilation brick magnesia repair materials, Block brick containing zirconium corundum hot feed and its surrounding corundum magnesia fill material.

Ventilation-type repair material is the key technology of self-assembly and self-reaction, self-sintering degree of control, so as to obtain a good ventilation effect. (%) Is Al2O3 65-86, Cr2O3 4-15, the bonding time is 1-3min, the drying bond strength "1MPa, 1500 ℃ bond strength (in) > 6 MPa. The pellet composition < 0.074 mm is more than 90%.

LINKS: High Alumina Brick | Low Porosity Clay Brick | Micro Silica | Spherical Asphalt | Andalusite | Flake Graphite | Aluminum Hydroxide | Aluminum Powder | Kyanite | High Alumina Cement | Explosion-Proof Fiber

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Micro Silica used as fire refractory material

Micro silica in the special refractories can form a multi-layer protective layer during oxide. It has good mechanical properties and resistance to high temperature and oxidation. The special refractory with ultrafine silica powder has obvious improving on the flowability, sintering properties, binding, filled pores performance.

Micro silica

Silicon Powder Physicochemical Properties:

1, Micro silica appearance: white；Refractoriness > 1600 ℃； Bulk density: 200 to 250 kg / m3.
2, Silica fume fineness: 90% fineness of 0.1μm; average particle size of 0.1 ~ 0.2μm, specific surface area: 20 ~ 28m2 / g. Fineness and specific surface area is 80 to 100 times of that  of cement, 50 to 70 times of fly ash.

3, Micro silica particle morphology and mineralogical structure: Due to the surface tension of the phase change, micro silica fume forms into amorphous phase amorphous spherical particles with smooth surface, or a plurality of ball particles stick together.

Micro silica fume is a high activity pozzolanic material with large surface area. Micro silica in materials will play the role of lubrication with the tiny spherical body.
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Brown Fused Alumina used as refractory raw material

Brown Fused Alumina can be for the manufacture of advanced refractories, castable and refractory bricks. It has characteristics of high purity, good crystalline liquidity, low coefficient of linear expansion and corrosion-resistant. Dozens of refractory manufacturers have proved in practice that Brown Fused Alumina has features of no detonate, no powder, no crack in the application process. In particular, its performance is much better than traditional corundum, making it the best corundum refractory aggregate and filler.

Brown Fused Alumina 

Brown Corundum Raw materials:

1. bauxite: main raw material of smelting corundum, corundum ceramics and single crystal corundum. Bauxite, also known as alumina, main content is aluminum trihydrate (Al203 3H20),  boehmite (A1203 H20), as well as mixtures of opal, hematite, goethite and other minor components. It has requirements on chemical composition, degree of dehydration, melting point and the block for the production of brown corundum.

2. carbon materials: reducing agent of corundum smelting, commonly used material are petroleum coke and anthracite.

3. iron: refining agent and diluents for corundum smelting and dilution of silicon alloy density, commonly used materials are steel scrap, cast iron scrap.

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White Corundum is fire refractory material

White corundum takes industrial alumina powder as raw material, fired in arc melting temperature above 2000℃, then processed by cooling, crushing plastic, magnetic separation for iron removal, screening into a variety of sizes. Its dense texture, high hardness, sharp corners like appearance make it can be used to manufacture advanced refractories.

White corundum

White corundum is a kind of fused alumina products made from high quality alumina powder. White corundum is characterized of high hardness, high purity, excellent self-sharpening, big grinding power, less heat, high efficiency, acid corrosion, high temperature resistance, good thermal stability. As a refractory material, white corundum can be pickling white corundum powder or aggregate granules.

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Magnesium Aluminate Spinel USED AS REFRACTORY MATERIAL

About Magnesium Aluminate Spinel

1. Raw material: High-quality bauxite with Al203 content ≥76% and high quality light burning magnesium powder with MgO content ≥95%
2. Firing temperature: 1800℃ in ultra-high-temperature tunnel kiln.

Magnesium Aluminate Spinel

3. Features: high bulk density, high mineral phase content, well developed grain, uniform structure, good quality and stability. Magnesium Aluminate Spinel has good resistance to corrosion, erosion and flaking, good slag resistance, resistance to abrasion, good thermal shock resistance, high temperature performance.
4. Application: Raw material of Magnesium Aluminate Spinel bricks in cement rotary kiln, Ladle lining brick, ladle castable. Spinel is widely used in refractories, steel smelting, cement kiln and glass industrial furnace.

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Spherical Asphalt as fire refractory material in China

Spherical asphalt has fixed carbon, Toluene insolubles, High resin content and low ash content, which is widely used in Iron trough castable, gunning in blast furnace, Ramming materials and unshaped refractory castables. Additive carbon material. Spherical asphalt binder can also play a role in increasing carbon, product temperature and resistance to erosion.

Spherical asphalt

Spherical asphalt is made from coal tar pitch which is processed by heating, spraying, cooling and molding. Put the test material asphalt into dissolved kettle for heating and dissolving. At the same time turn on the power electric lap and liquid asphalt is ejected from the nozzle, the air make it atomized into fine particles. Asphalt particles in the cooling tower come into semi-finished products which sent into the three million vibration screening filter from the cooling bottom to get the final spherical asphalt products.

Softening point: 110 ℃,
Coking value: 58%,
Ash: 0.3%,
Volatile matter: 57%
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Andalusite as fire refractory material in China

Andalusite is an aluminum silicate mineral, which is refractories used in spark plug and porcelain materials. It is high-quality refractory materials used for smelting industry in the production of advanced refractory, unshaped refractory and refractory bricks.

Andalusite is generally columnar crystals, with cross-section close to the square shape. The shape of aggregate is radially or granular, commonly known as chrysanthemum stone. Andalusite color can be pink, rose red, red-brown or gray, vitreous luster, medium cylindrical cleavage. Morse hardness: 6.5 to 7.5, proportion: 3.15 to 3.16. Heating to 1300 ℃, Andalusite will turn into mullite, which is one of the raw materials to produce advanced refractories.

Andalusite

After calcination, Andalusite can be made profiles that can be used for key parts of the stove, hot air tower, and then stir-fried, it can also be used for a variety of auxiliary casting and handling equipment, can also make the furnace facilities, high temperature aluminum silicate insulator, foundry mold fabrics.

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Flake Graphite used as fire refractory material

Flake graphite is widely used in advanced refractory and metallurgical coatings industry. Such as MgO-C, the crucible, Military industrial explosive materials stabilizer, smelting industry desulfurization agent, pencil of light industry, electrical industry, carbon brush, the battery industry electrodes, chemical fertilizer industry catalyst.

Flake graphite

Graphite can produce milk graphite used in lubricants, mold release agents, drawing agents, electrically conductive coatings. It can also produce expanded graphite for flexible graphite products raw materials, such as flexible graphite seals and flexible graphite complex material products.

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Aluminum Hydroxide - Refractory Fire Material

Aluminum hydroxide is one of most widely used inorganic flame retardant additives. It can also for fire-retardant, prevent smoke, no droppings, no toxic gases, with wider range of applications.

Aluminum hydroxide

Application:

Thermosetting plastics, thermoplastics, synthetic rubber, paint and building materials industries. Meanwhile, aluminum hydroxide is the basic raw material required for aluminum fluoride in aluminum industry.

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Explosion-Proof Fiber used as Refractory Material

Bulk materials such as spreads, castable monolithic refractories.

Performance:

1, Anti tensile, impact resistance, improve overall strength.

2, Hydrophobic, exhaust, anti-cracking, anti-burst.

3, Shorten the curing period, simplify heating process and improve the overall service life.

Explosion-Proof Fiber

Use:

Explosion-Proof Fiber is mixed with other refractory materials, after forming, baking, baking with temperature rising, and when the fiber reaches a certain temperature begins to soften, shrink, melt, and finally the formation of pores and carbonation. They form small vivo distribution network pores in construction, so it can open the passage of water vapor, reducing internal stress and prevent bursting.

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Aluminum Powder | Aluminum Powder as Refractory Material

Application:

Aluminum powder has the features of Lightweight, evenly distributed, strong antioxidant capacity, high floating power, good hiding power, which has good reflective properties to light and heat. Aluminum metal powder can be used as an additive in carbonaceous refractory products (MgO-C bricks, alumina magnesia bricks), which can greatly improve the oxidation resistance of the product, thereby increasing its service life.

Aluminum powder

 Active aluminum content and the value of the median diameter D50 are the main roles of aluminum powder. The higher of active aluminum content, the better of oxidation resistance. The smaller of the median diameter value, more uniform distribution, the greater of the contact area aluminum with other elements of (i.e., larger specific surface area) then the better of product oxidation resistance.

Al   99.5％    
Fe  ≤0.15%           
Si  ≤0.2%
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Sodium Tripolyphosphate - refractory material

Product Description:

Sodium tripolyphosphate is a white powder material with melting point 622 ℃, which is soluble in water with significant chelating capacity to calcium and magnesium and other metal ions, it can soften hard water to make suspension into solution. Features: slightly alkaline, non-corrosive, sodium tripolyphosphate is an inorganic surfactant, which has strong emulsification with lubricating oil and fat, bulk density is usually divided into a low density 0.35-0.5g / cm 3, medium density of 0.51-0.65g / cm 3, high density 0.66-0.9g / cm 3.

Sodium tripolyphosphate have two crystalline forms: type I (high temperature type) and type II (low temperature type), both with the same chemical properties, type I thermal stability and moisture difference is higher than that of type II, and the solubility, dissolution heat of hydration is also different between them.

Sodium tripolyphosphate

Application: 

Sodium Tripolyphosphate can be used in many refractories such as bulk material, castables, Ramming mixes. It is reducing agent, glue solution, Flame retardants and binding agent in magnesia refractory.

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