Production method of environment-friendly and energy-saving type regenerative magnesia-carbon brick

Abstract

The invention discloses a production method of an environment-friendly and energy-saving type regenerative magnesia-carbon brick, comprising the following production steps: (1) sorting and crushing waste magnesia-carbon bricks; (2) powdering with weak acid aqueous solution; (3) carrying out high-temperature drying to dehydrate and electromagentic resonance to homogenize; (4) carrying out crushing, particle shaping, iron removing and screening; (5) mixing materials: mixing regenerative aggregates, fine powder and newly-added and electrically-fused magnesite aggregates, and fine powder; and (6)forming. The mixed material is added with a bonding agent, is treated by high-speed constant-temperature mixing, hydraulic forming and electric heating drying and obtains a regenerative magnesia-carbon brick product. The production method solves the problem that the product in the prior art has unstable performance, can retain usable components such as electrically-fused magnesite, crystalline flake graphite and the like in the raw material furthest, has high recovery and utilization rate and is energy-saving and environment-friendly.

Description

Technical field [0001] The invention relates to a method for recycling refractory materials, in particular to a method for producing environmentally friendly and energy-saving recycled magnesia carbon bricks. Background technique [0002] At present, magnesia-carbon bricks are widely used as refractory materials in steel smelting production, and are generally used as lining bricks for ladle. my country is a big country in iron and steel. The annual consumption of magnesia carbon bricks reaches more than 2 million tons, and the discarded magnesia carbon bricks reach more than 600,000 tons. Most of these refractories after use are treated as garbage, and only a small amount is roughly used, which is not only a waste Resources and pollute the environment. Some domestic steel mills put used magnesia carbon bricks on converters and electric furnace linings to reduce the consumption of refractory materials. Some use waste magnesia carbon bricks to be processed into pellets as electric ...

AI Technical Summary

Problems solved by technology

This technology makes better use of waste magnesia-carbon bricks and saves resources, but there are still deficiencies. Since AL powder is generally added to the production formula of magnesia-carbon bricks as an antioxidant for carbon components, 4AL+H 2 O=AL 4 C 3 , AL 4 C 3 It is easy to hydrate at room temperature, resulting in cracking of the brick body, so the waste magnesia carbon brick should be hydrated before recycling