Mullite silicon carbide complex-phase fireproof material and preparation method thereof

Abstract

The invention relates to a mullite silicon carbide complex-phase fireproof material and a preparation method thereof. The mullite silicon carbide complex-phase fireproof material is characterized in that 48-60wt% of coating cladding mullite light aggregate, 9-15wt% of coating cladding silicon carbide aggregate, 6-12wt% of top-grade bauxite fine powder, 4-8wt% of andalusite fine powder, 3-5wt% of alpha-Al2O3 micro powder, 4-8wt% of Guangxi white clay, 1-3wt% of SiO2 micro powder, 4-6wt% of Si powder and 0.5-2wt% of Al powder are used as raw materials. The preparation method comprises the following steps of firstly mixing two kinds of the aggregate in the raw materials, adding a bonding agent, then performing mixed refining on the mixed aggregate, the bonding agent and other raw materials, performing material trapping, performing compression moulding, performing drying, and performing baking under the condition of 1250-1400 DEG C so as to obtain the mullite silicon carbide complex-phase fireproof material. The mullite silicon carbide complex-phase fireproof material prepared by the preparation method disclosed by the invention has the excellent characteristics of being low in heat conduction coefficients, good in erosion resistance, and high in intensity.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide-containing multiphase refractory materials. In particular, it relates to a mullite silicon carbide composite refractory material and a preparation method thereof. Background technique [0002] With the gradual increase of China's cement production, the cement industry's consumption of fossil energy has received more and more attention. Cement rotary kiln is an important equipment for cement firing, and its energy consumption often determines the energy consumption of the entire cement production system. Among them, the transition zone and the firing zone become the fastest heat dissipation parts due to the higher local temperature. In recent years, in order to reduce the consumption of fossil energy, the cement industry has adopted a large number of industrial solid waste and domestic waste as alternative fuels. However, components such as alkali, chlorine, and sulfur in these fuels are ...

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Problems solved by technology

[0003] "A microporous mullite-silicon carbide composite refractory material and its preparation method" (CN102432312) patent technology, using super-grade bauxite aggregate, silicon carbide, andalusite, pyrophyllite, etc. as raw materials to prepare microporous mullite carbonization Although the silicon composite refractory material has strong resistance to gaseous alkali, chlorine, sulfur and other corrosive gases, the proportion of dense super-grade bauxite aggregate and silicon carbide aggregate in the material is too high, which greatly improves the thermal conductivity of the material. coefficient, which is not conducive to the energy saving and heat preservation of cement kiln

"Low Thermal Conductivity Composite Silica Brick" (CN204478826) patented technology adopts the structural design of composite silica brick and phosphate brick. Although the design of the composite structure reduces the overall thermal conductivity of the material, it does not optimize the corrosion resistance of the material , resulting in silica bricks being easily damaged by alkali corrosion; on the other hand, the composite refractory material is combined with a binder at the joint of the two materials, which is prone to breakage during use, greatly reducing the service life of the material

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