Steel slag real-time circular iron removal and grinding method

Abstract

The invention discloses a steel slag real-time circular iron removal and grinding method, which belongs to the technical field of steel slag comprehensive utilization, and includes the following steps: feeding and iron removal, coarse crushing and iron removal, fine crushing and iron removal, and grinding and iron removal, and finally the ground steel slag with the specific surface area of 400 m2 / kg-500m2 / kg, and the metallic iron content smaller than or equal to 0.3%. Through utilizing the steel slag real-time circular iron removal and grinding method provided by the invention, the steel slagreal-time circular iron removal is combined with the 'more crushing and less grinding' and the 'segmented grinding' technologies for steel slags, so that not only the metallic iron in the steel slagsis fully recovered, but also the grinding efficiency in the steel slags is further improved, the energy consumption is reduced, and steel slag micro powder is obtained.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of steel slag, and more specifically relates to a method for real-time circulating iron removal and grinding of steel slag. Background technique [0002] Steel slag is the waste slag discharged during the steelmaking process. It is smelted at high temperature and then quenched. It has high iron content and poor grindability. The traditional iron removal treatment of steel slag is relatively extensive, resulting in the content of metallic iron in the finished steel slag powder is still about 4%, which is not conducive to subsequent applications. At present, steel slag is mainly used in building materials or cement admixtures, but due to its high iron content, poor grindability, and low activity, it is difficult to guarantee the quality of cement, and the amount of addition is limited, so it can only be used as a base material for construction or paving. . Therefore, in order to ...

AI Technical Summary

Problems solved by technology

The traditional steel slag iron removal treatment method is relatively extensive, resulting in the content of metallic iron in the finished steel slag powder is still about 4%, which is not conducive to subsequent applications

At present, steel slag is mainly used in building materials or cement admixtures, but due to its high iron content, poor grindability, and low activity, it is difficult to guarantee the quality of cement, and the amount of addition is limited, so it can only be used as a base material for construction or paving.

Therefore, in order to solve the problems of low steel slag utilization rate, high grinding energy consumption and small application range, it is necessary to improve the recovery efficiency of metallic iron in the steel slag grinding process and remove the metallic iron in the steel slag to improve the grindability of steel slag and reduce the Reduce energy consumption and mill steel consumption, improve grinding efficiency

[0003] In the prior art, the patent CN107876213A discloses a method for removing iron from steel slag. Steel slag is crushed, ball milled, shaker separated, magnetically separated, foam flotation, and secondary magnetically separated to completely remove iron from steel slag, realizing resource recovery. Utilization, but the flotation process involves wet iron selection, which will produce a large amount of steel slag that cannot be used, and involves wastewater treatment, which is likely to cause blockage of equipment and pipelines; patent CN109092844B discloses a multi-stage treatment method for steel slag, Including crushing, screening and magnetic separation of steel slag circulation, and finally get iron powder with TFe>60% and tailings with MFe<1%, but the iron selection process requires many and complicated equipment, high energy consumption, and the final product has a relatively small Coarse; Patent CN106694517B discloses a production process for the purification of steel slag magnetic separation powder to prepare steel slag micropowder. The steel slag is dried, coarsely broken by a roller press, broken up by a dispersing classifier, primary magnetic separation, steam mill grinding, secondary magnetic Finally, active steel slag powder and inactive steel slag powder can be obtained, but the steam mill requires a lot of power and high energy consumption

[0004] Therefore, it is an urgent problem for those skilled in the art to provide a steel slag real-time circulation iron removal and grinding method with high grinding efficiency of metallic iron and low energy consumption during the steel slag grinding process.

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