The matrix composition has an important influence on the application temperature, high temperature mechanical function and sintering function of refractory castables. The matrix should be mainly bauxite clinker with low K2O and Na2O content, control the participation of cement, optimize the batching, so that the matrix of the refractory castables is similar to the chemical composition of mullite (A3S2). That is, adjust the content of Al2O3 and SiO2 in the matrix, so that it generates mullite at temperature to generate volume micro-expansion, in order to improve the thermal shock resistance and high-temperature strength.
Adopt pure calcium aluminate cement as fusion agent. Its key component is calcium aluminate decomposition temperature 1600 ℃, activity is very high, coagulation rate is normal, strong rate fast, high strength in the early stage, late strength increase is not obvious; hydration, strong rate is slow, low strength in the early stage, late strength.
Through the hydration of the cement coagulation effect, the aggregate and powder cementation in the way, the amount of participation is less than 5% is appropriate. Participate in the appropriate amount of micro-powder. The participation of micro-powder can fill the leisure between the particles, improve the structure inside, and make it dense by agglomeration and fusion; meanwhile, it can significantly increase the mobility and greatly reduce the construction water consumption. In 110 ℃, 24h its participation is greater than 8%, refractory castables tightening becomes large, cracks more, to 4%-5% is appropriate, the difference in the content of micropowder castables physical properties.
Participate in the appropriate amount of dispersant (water reducing agent can elevate the dispersibility of micropowder particles in the castables, so that the distance between the particles becomes larger, gravitational force and friction reduction, and further elevate the mobility of the refractory castables, and at the same time to exclude the free water trapped by the particles of the agglomerates, so that the castables have mobility and reduce the amount of water used for its construction. If sodium tripolyphosphate is used as dispersant, it is suitable to participate 0.05~0.5%.
ZhenAn Refractories Co., Limited, located in Anyang City, China, has many years of experience and technology accumulation in the refractory industry.At present, ZhenAn's has an annual output of 80,000 tons of shaped refractory production lines and an annual output of 50,000 tons of unshaped refractory production lines, all of which are fully automatic and intelligent production lines.Now our company has a production line for shaped products, a production line for unshaped refractory materials, a production workshop for assembly of composite bricks, and a production line for acid and alkali resistant and anti-corrosion materials; the plant covers an area of about 16,000 square meters.
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