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There are many kinds of raw materials for refractory bricks, which are mainly divided into six categories: soil, stone, sand, ore, powder and others.
1. soil: aluminum soil, clay, kaolin, diatomite;
2. stone: fluorite, kyanite, andalusite, forsterite, vermiculite, mullite, pyrophyllite, dolomite, chlorite, sillimanite, spinel, silica;
3. sand: ceramic sand, zircon sand, quartz sand, magnesia
4. ore: chromium ore
5. powder: aluminum powder, silica fume, metal powder;
6. others: asphalt, graphite, phenolic resin, perlite, cenosphere, sialon, corundum, silicon carbide, sulfuric acid, water glass, silica sol, boron carbide, calcium aluminate cement, nitride materials, shale, alumina, zirconia alumina sol, etc.
In the Refractories world thirty-five years ago, no one was working with silica fume and few knew what it was. Within a few years, it was being used as an additive to brick. When added to high Alumina brick, mullite was formed in the matrix of the brick on firing, giving the brick good volume stability, strength and chemical resistance. When used in basic brick, high hot strengths resulted, at least at oF, which was about the limit of what could be tested. At the time it was only logical that silica fume would be used in brick not castables. Brick were used for all critical applications, no one would have considered using castables. Today&#;s refractory castables have gone beyond having
&#;brick-like properties&#; to actually out performing brick in many applications. Silica fume has played a major role in this transformation.
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Silica fume, also known as microsilica, is an amorphous polymorph of silicon dioxide. It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production. It is a very fine pozzolanic material which can be used in a variety of cementitious products to improve their performances. (such as concrete, grouts, mortars as well as elastomer, polymer, refractory, ceramic and rubber applications)
Silica fume specifications:
ItemSiO2Al2O3Fe2O3MgOCaONaOPHAverage value75&#;96%1.0±0.2%0.9±0.3%0.7±0.1%0.3±0.1%1.3±0.2%neutralIf you feel interest, please feel free to contact us by : .
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After replacing cement with silica fume, its function is similar to fly ash, which can improve the workability of concrete mixture, reduce the heat of hydration, improve the corrosion resistance, frost resistance and impermeability of concrete, and inhibit the alkali-aggregate reaction, and its effect is much better than that of fly ash. SiO2 in silica fume can react with Ca (OH) 2 at an early stage to produce hydrated calcium silicate. Therefore, replacing cement with silica fume can improve the early strength of concrete.
Although the replacement of cement with silica fume is generally 5% &#; 15%, the cement slurry will become very viscous when it exceeds 20%. The water consumption for concrete mixing increases with the addition of silica fume. Therefore, when silica fume is added to concrete, water reducer must be added at the same time, so as to obtain the best effect. Silica fume can improve the pumping performance of concrete and can withstand more vibration without segregation. In addition, silica fume can improve the fluidity of concrete. Using the same pouring method, silica fume concrete can have a slump of 500px higher than ordinary concrete. Silica fume concrete is very sensitive to early shrinkage cracks, and special attention should be paid to the control of curing conditions.
At present, silica fume has been widely used, and is mainly used for preparing high-strength and ultra-high-strength concrete, high impermeability concrete, underwater anti-dispersion concrete and other required concrete.
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