Efficient separation and recycling method for RO phase in steel slag

Abstract

The invention discloses an efficient separation and recycling method for an RO phase in steel slag. The method comprises the following steps: 1) crushing the steel slag; 2) loading electric charges; 3) carrying out RO phase separation; and 4) carrying out separation and recycling. The method disclosed by the invention has the advantages that the steel slag is taken as a treating object, firstly the steel slag is crushed and screened, particle size is less than 100 meshes, and then steel slag micro powder passes through an electric charge loading device, so that fine powder particles carry thesame electric charge and produce electrostatic repulsion mutually, and ultra-dispersed treatment is realized; then air is blasted, so that the fine powder particles pass through an electromagnetic separator in a suspension state, the RO phase is separated and removed, residual materials are recycled, utilization rate of the steel slag is improved, and the method disclosed by the invention is significant to comprehensive utilization of resources and environmental protection.

Description

technical field [0001] The invention relates to a method for efficiently separating and recovering RO phases in steel slag, and belongs to the technical field of metallurgical resource reuse. Background technique [0002] In recent years, my country's crude steel output is huge, and the amount of steel slag produced is about 100 million tons, but the comprehensive utilization rate of steel slag is only about 10%. Due to the low comprehensive utilization rate of steel slag, a large amount of steel slag is piled up around iron and steel production enterprises, which not only affects the normal production of iron and steel enterprises, but also occupies cultivated land, causing serious environmental pollution. [0003] The main components of steel slag are similar to Portland cement clinker, including β-C2S, C3S, calcium aluminum ferrite, calcium ferrite, etc., so steel slag has gelling activity. At present, steel slag is mainly used as cement raw material, cement admixture or...

AI Technical Summary

Problems solved by technology

If it is directly used in cement production, because the RO phase content in the steel slag is still above 20%, the mixing ratio is severely limited; after grinding and sorting, it is greatly affected by the particle size of the steel slag powder. When the particle size is large, RO The phase extraction effect is very poor, a large amount of RO phase still remains in the steel slag particles, and when the particle size is small, the particles are easy to adhere to each other, and a good RO phase extraction effect cannot be achieved.

After the existing steel slag RO phase magnetic separation method processes the steel slag, the RO phase content in the remaining material is generally more than 15%, which still has great restrictions on the use of steel slag in cement production

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