Refractory brick and preparation method thereof

Abstract

The invention discloses a refractory brick and a preparation method thereof; the refractory brick comprises the raw materials by weight percent: 60-70% of high-aluminum refractory aggregate, 20-30% of refractory cement, 1-3% of metal aluminum powder, 1-3% of metal silicon powder, 2-4% of silica micro-powder and 5-10% of aluminum oxide. The preparation method comprises the steps of: evenly mixing the metal aluminum powder, the metal silicon powder, the silica micro-powder and the aluminum oxide; adding hot water for diluting the mixture, wherein the amount of the hot water is 4-5 times more than the total amount of the mixture, and the temperature of the hot water is 70-90 DEG C; adding the high-aluminum refractory aggregate and the refractory cement into the diluted mixture, and evenly stirring; putting a product into a mould for molding; and drying to obtain the refractory brick. The refractory brick is not required to be fired, and can be directly molded by the mould after being evenly stirred; and the refractory brick can be recycled after being rejected.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a refractory brick used for building a kiln body or inner lining of a high-temperature furnace. Background technique [0002] Refractories are important basic materials in the industrial field. At present, industrial furnaces and their inner linings for steel smelting, coke, and mechanical heat treatment systems all require refractory materials. A large number of refractory bricks are required for the furnace and inner lining. Most of the refractory bricks are sticky heat-insulating refractory bricks, and clay bricks are mainly composed of mullite (25%-50%), glass phase (25%-60%), cristobalite and quartz (up to 30%) . Usually hard clay is used as raw material, the clinker is calcined in advance, and then mixed with soft clay, molded by semi-dry method or plastic method, and fired at 1300-1400 C to make clay brick products. A small amount of water glass, cement and ...

AI Technical Summary

Problems solved by technology

The clay refractory brick needs to be fired in the kiln in advance, which not only consumes a lot of fuel, but also emits waste gas, pollutes the environment, wastes energy, and increases the cost of the refractory brick

Also, this refractory brick has a short service life and cannot be reused.

[0003] Another Chinese patent number is: 200710062457.5 invention patent discloses a silicon heat-insulating refractory brick, specifically a silicon heat-insulating refractory brick suitable for coke ovens and carbon furnaces, which solves the problem of existing clay-based heat-insulating refractory bricks. Bricks have defects such as low load deformation temperature, easy shrinkage at high temperature, high thermal conductivity, and poor thermal insulation effect. They are composed of 81-85% silica fine powder, 15-19% perlite, and the following auxiliary materials accounting for the total weight of the above-mentioned main raw materials. : Iron scale powder 0.45-0.55%, cement 0.9-1.1%, lime milk 6.5-7.5%, pulp 1.95-2.2%, add silica fine powder and perlite to the wet mill in proportion, then add iron scale powder, cement dry After grinding for 1-2 minutes, add water accounting for 1.8-2.2% of the total weight of the main raw materials, then add lime milk, and roll for 10-15 minutes, and finally add pulp, roll for 10-15 minutes, roll out, and shape the billet