Multifiber reinforced magnesia-alumina-carbon refractory material and preparation process thereof

Abstract

The invention relates to a multifiber reinforced magnesia-alumina-carbon refractory material and a preparation process thereof. A refractory brick is prepared from the following raw materials in percentages by weight: 8 to 10% of A-grade dead-burnt magnesia fine powder, 5 to 7% of B-grade dead-burnt magnesia fine powder, 19 to 22% of C-grade dead-burnt magnesia fine powder, 11 to 13% of D-grade dead-burnt magnesia fine powder, 8 to 10% of E-grade dead-burnt magnesia fine powder, 15 to 18% of F-grade dead-burnt magnesia fine powder, 7 to 8% of a binder A, 5.5 to 7.5% of a binder B, 1.3 to 1.7% of a binder C, 6 to 8% of metal aluminum powder and 0.3 to 0.5% of an additive. According to the invention, products and raw materials are safe and non-toxic, and may not cause harmful effects to users and the environment; good physical properties and wide application prospects in the fields of metallurgy and steelmaking are realized; the refractory material is improved in mechanical properties of the substrate thereof by mixed application of dead-burnt magnesia fine powder with different particles sizes, and is superior to a substrate material prepared from the dead-burnt magnesia fine powder with single particle size; the fiber structure greatly improves the mechanical properties of the material; meanwhile, carbon is difficult to be diffused into molten steel after carbon nanotube fiber is formed, so the pollution of the refractory materials to the molten steel is greatly reduced.

Description

technical field [0001] The invention relates to a refractory material, in particular to a multi-fiber reinforced magnesium-aluminum-carbon refractory material with physical properties such as high density, high compressive strength, high volume stability and erosion resistance and a preparation process thereof. Background technique [0002] Magnesia-carbonaceous materials are very suitable for oxygen top-blown converters, electric arc furnaces and ladles in the iron and steel industry. Magnesium oxide-carbonaceous materials currently on the market have good thermal shock resistance and corrosion resistance due to their high flake graphite content, high thermal conductivity, low expansion coefficient, and poor wettability by molten steel. However, high carbon content will cause poor oxidation resistance, high heat loss, drop in molten steel temperature, and increased carbon content in molten steel, which will seriously affect the production of high-quality steel. [0003] On...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of easy oxidation, high heat loss and easy pollution to molten steel during the use of magnesia-carbon refractory materials in the field of metallurgical steelmaking, and provides a multi-stage dead-burned magnesia fine powder, liquid Multi-fiber reinforced magnesium with high oxidation resistance, strong thermal conductivity and strong corrosion resistance under high temperature conditions prepared by phenolic resin, nano-nickel modified resin, phenolic resin powder, metal aluminum powder and nano-iron powder, and does not pollute molten steel Aluminum-carbon refractory materials, and on this basis, the thermal shock resistance, normal temperature mechanical properties and high temperature mechanical properties of the material have practical effects in many aspects.