Steel slag treatment technology and application of tailings obtained by steel slag treatment process

Abstract

The invention belongs to the technical field of steel slag production and application, and discloses a steel slag treatment technology. The steel slag treatment technology comprises the following steps that: 1) pretreatment is performed on steel slag, wherein the pretreatment involves hot splashing treatment and piling braising; and (2) steel slag obtained after pretreatment in the step (1) is screened after being subjected to three-stage crushing, materials with the particle size smaller than or equal to 8 mm are directly subjected to multi-stage magnetic separation, magnetic substances are final product steel fine powder, non-magnetic substances are final product tailings, materials with the particle size larger than 8 mm enter a rod mill to be crushed again, the crushed materials are screened again, the materials with the particle size larger than 8 mm are sorted through a magnetic separator, magnetic substances are final product particle steel, and non-magnetic substances circularly enter the rod mill. According to the process of the technology, sewage and visual pollution are not generated, production is not affected by regions and seasons, and the TFe grade of the steel fine powder and the recovery rate of the magnetic substance are improved; and the application channel of the steel slag tailings is widened, the steel slag tailings can be used for road surface layers in alpine regions, the benefits of the tailings are improved, and cyclic utilization of metallurgical solid waste resources is achieved.

Description

technical field [0001] The invention relates to the technical field of steel slag production and application, in particular to a steel slag treatment process and the application of the obtained tailing slag. Background technique [0002] Iron and steel metallurgical waste slag is solid slag containing calcium, magnesium, aluminum, silicon and other elements produced in the steelmaking process of the iron and steel industry. In recent years, with the development of my country's economy, the production capacity of steel has increased, and the discharge of steel slag has also increased. Judging from the production situation of domestic steel enterprises, the current annual output of steel slag exceeds 120 million tons. In addition, due to the low utilization rate of steel slag, the current stockpile of steel slag is huge, causing serious land occupation, pollution and waste of resources. In view of the severe stockpiling of steel slag, the "Environmental Protection Tax Law" wa...

AI Technical Summary

Problems solved by technology

However, in this process, the control index of free calcium oxide in tailings is high, and the utilization direction is single, resulting in the loss of benefits; the particle size control of materials is uneven, the separation effect of slag and iron is poor, and the recovery rate of magnetic substances is low; dry grinding and dry selection can be seen on site Sexual pollution control is difficult

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