Method for producing aggregate from steel waste slag

Abstract

The invention discloses a method for producing aggregates by using waste slag of steels, which comprises the following steps: at first, the waste slag discharged by a steel factory after being used is recycled; the physicochemical index of the waste slag is that: SiC is equal to or more than 1 percent, Al2O3 is equal to or more than 42 percent, and C is equal to or more than 1 percent; the waste slag is cracked in sequence by a jaw crusher and a twin roller; the cracked materials are washed by a sand muller provided with a roller wheel, and aired; then the Fe2O3 in the cracked materials is removed, and finally the cracked materials are screened to be divided into aggregates of different grain diameters and recycled waste slag powder the meshes of which are equal to or less than 320. The recycled materials can be used as the material for preparing an iron runner; and the rest material can also be respectively used for other fire-proof products, thus realizing zero discharge. Compared with the manufacture materials of high energy consumption like the materials of compact corundum, sub-white corundum, excellent high alumina and carborundum used by the traditional trough ramming materials, the method has the advantages of reducing the product cost by more than 30 percent and having a better use effect; moreover, the method saves resources, and energies, reduces the environment pollution sources, and has excellent economic and social benefits.

Description

technical field [0001] The invention relates to a production method of aggregate, which can be used to make iron gutter ramming material after preparation, and the iron gutter ramming material belongs to the main refractory material in iron and steel metallurgy blast furnace tapping system. Background technique [0002] In the early days, the blast furnace tapping channel was generally made of clay clinker, coke grains, light clay and tar pitch. The amount of iron passing was small, the repair was frequent, the working conditions were poor, and the environment was polluted. In recent years, Al 2 o 3 -SiC-C ramming material and Al 2 o 3 -SiC-C castables, which are generally made of dense corundum, sub-white corundum, brown corundum, high-quality high-alumina clinker, silicon carbide and flake graphite plus various ultrafine powders, additives and binders. The above materials are all resource materials, which consume a lot of energy in the manufacturing process and require ...

AI Technical Summary

Problems solved by technology

[0002] In the early days, the blast furnace tapping channel was generally made of clay clinker, coke grains, light clay and tar pitch. The amount of iron passing was small, the repair was frequent, the working conditions were poor, and the environment was polluted. In recent years, Al 2 o 3 -SiC-C ramming material and Al 2 o 3 -SiC-C castables, which are generally made of dense corundum, sub-white corundum, brown corundum, high-quality high-alumina clinker, silicon carbide and flake graphite plus various ultrafine powders, admixtures and binders. The above materials are all resource materials, which consume a lot of energy in the manufacturing process and require a large investment in equipment installation. In addition, with the current material scheme, not only the cost of iron trench materials is relatively expensive, but also the iron and steel production plants cannot timely and effectively dispose of waste slag. Make full use of it, objectively there is also the actual situation of increasing environmental pollution