What kind of refractory castable is used for furnace lining at 1300℃

Before choosing, we must firstly consider the fuel used by the furnace, the raw material medium of the fired product, and the corrosiveness degree and nature of the raw material composition, is it acidic or alkaline? In addition, there are external factors to consider the furnace type, whether there is wind speed, mechanical stress caused by erosion wear, and then the combustion mode.

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Selection of refractory materials for cement rotary kiln lining

At the back of the cement rotary kiln, the length of the kiln mouth is about 1 meter, wear-resistant castable can be selected, but it must have a certain degree of alkaline resistance. The castable area from 10D to the rear kiln entrance can use anti-spalling high-alumina bricks; The 7D-10D section of the rotary kiln can use silmo brick or Silmo red brick; Section 5D-7D is a transitional zone, which can use magnesia-aluminum spinel brick; The 6D-7D section can also use Silmo brick or Silmo red brick;

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Light weight acid-proof castable use for chimney lining

The chimney lining is made of light weight acid-resistant castable, which has strong air tightness, and does not require light and heavy layers. The two-layer material construction reduces the thickness of the lining and improves the thermal insulation performance.

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What kind of furnace lining is suitable to use phosphate brick?

Phosphate brick is most suitable for use in white ash kiln, zinc kiln lining, can be used for high temperature zone and transition zone. If it is a white-ash rotary kiln, the entire kiln lining can use phosphate bricks, but it is the use of high density bricks in the high temperature zone, and the use of low density bricks in the transition zone.

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The difference between Corundum brick and chrome corundum brick

The corundum brick is a kind of refractory brick with alumina content greater than 85%, corundum brick is divided into sintered and fused corundum brick, and chrome corundum refractory brick is added to corundum Cr2O3, after high temperature molding, high temperature sintering of high-grade refractory brick, chrome corundum refractory brick is also divided into fused cast chromium, sintered chrome corundum refractory brick.

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Characteristics and functions of refractory ramming materials

The advantage of refractory ramming material is that it can be pounded on the spot in the form of ramming, the equipment uses air pick or mechanical ramming, the amount of material is less or the use of unimportant parts, and it can also be tied by hand. However, the disadvantage of refractory ramming material is that the construction speed is faster than that of refractory castable, and the labor intensity is greater than that of castable.

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Dry barrier refractory for electrolytic aluminum

The process of dry barrier refractory is made of clay clinker as refractory aggregate, and the third grade high aluminum clinker is processed into different granular aggregate and powder, which is processed by micro-powder technology and bonding agent.

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The difference between high alumina brick and anti – spalling high alumina brick

High alumina brick and anti-spalling high alumina brick compared, anti-spalling high alumina brick is made of high bauxite and zircon as raw materials, high strength, chemical corrosion resistance, low thermal expansion coefficient, low thermal conductivity. And high alumina brick is made of high bauxite as raw material, chemical corrosion resistance is not as good as anti-spalling high alumina brick, mainly anti-spalling high alumina brick than high alumina brick thermal shock stability.

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Are silicon bricks suitable for electric furnace tops?

Electric furnace top in more than 20 years ago, in foreign countries, the use of silicon brick as the top material, but in China, generally are high aluminum brick or prefabricated block to do the top. Because the top of electric arc furnace is affected by the sudden change of temperature, slag injection, gas erosion and thermal radiation, the top refractory materials must have good thermal shock stability, corrosion resistance and high refractories. Firebrick for furnace cover is an evolutionary process of silicon brick, high alumina brick, alkaline brick and amorphous refractory (large prefabricated block). Because of the poor thermal shock resistance of silicon brick, the use of furnace top only about 60 times, in China as early as 20 years ago has not used silicon brick for the top of electric furnace. Alkaline firebrick is also some of its own shortcomings, can not resist the ultra-cold, extremely hot temperature changes under ultra-high power, silicon brick and alkaline brick has been replaced by a high alumina brick, corundum brick, high alumina precast block, castable. In particular, the water-cooled furnace cover only uses refractory materials in the central part of the furnace cover. The use of molded bricks to build the...

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Quality differences of fire clay bricks in different area in China

Fire clay bricks quality is different indifferent area in China due to the local raw materials level, for example of the clay bricks in Henan, the aluminum content is high and more purity, the body is dense, and the use effect is almost the same as the general three-level high aluminum bricks.

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Does the castable still usable without fluidity after adding retarder?

After the castable is added with retarding agent, it cannot be used without fluidity, because the castable has difficulty condensing without fluidity, which seriously affects the strength of the castable.   As for the castable manufacturers, under normal circumstances, according to the weather throughout the year, they will add coagulant in winter, and add retarder in summer to adjust the condensation of castable. Because below 5℃ and above 33℃ will affect the solidification time of castable. The most suitable temperature for the construction of castable is 15-25 ° C, if it is a fast-drying explosion-proof castable, below 15°C must be added to the binder for adjustment intervention.   If the setting time is too long or the fluidity is directly lost after the addition of retarder in summer, one is that the retarder is added to excess, and the other is that the ratio of coarse particles and fine powders is unreasonable in the castable process ratio. If the ratio of coarse particles and fine powder is unreasonable, the castable will be separated and stratified when mixed with water during construction.   If the fluidity of retarding agent is reduced in the laboratory, this batch of castable can not be...

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The difference between high alumina brick and anti – spalling high alumina brick

High alumina brick and anti-spalling high alumina brick compared, anti-spalling high alumina brick is made of high bauxite and zircon as raw materials, high strength, chemical corrosion resistance, low thermal expansion coefficient, low thermal conductivity. And high alumina brick is made of high bauxite as raw material, chemical corrosion resistance is not as good as anti-spalling high alumina brick, mainly anti-spalling high alumina brick than high alumina brick thermal shock stability.

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