Method for recycling iron from steel slag

Abstract

The invention belongs to the field of recycling of steel slag, in particular to a method for recycling iron from steel slag. The method comprises the following steps of: (1) pouring steel slag into a grate plate with the length and the width of 180 mm respectively, leading the steel slag with granularity smaller than 180 mm to enter an underground material bin and carrying out first iron recycling on the steel slag with granularity larger than 180 mm by an electromagnetic sucking disk; (2) magnetically separating and crushing the steel slag with granularity smaller than 180 mm, wherein the crushed granularity is smaller than 60 mm; (3) magnetically separating the crushed steel slag; (4) screening by a vibrating screen, leading steel slag with granularity larger than 25 mm to enter a cone crusher for carrying out second crushing with the crushed granularity smaller than 25 mm, and magnetically separating; (5) grinding steel slag with granularity smaller than 25 mm, screening by a cylinder screen with granularity of 2 mm and remelting particle steel with granularity larger than 2 mm for utilizing; and after magnetically separating steel slag with granularity smaller than 2 mm by a wet magnetic separator, separating iron fine powder and tailings. The invention can recycle iron in the steel slag and reduce the iron content of the steel slag below 0.5 percent.

Description

technical field [0001] The invention belongs to the field of steel slag reuse, and in particular relates to a method for recovering iron from steel slag. Background technique [0002] Steel slag is the waste slag produced by the steelmaking industry, and its emission is about 13%-20% of steel production. At present, the annual production of steel slag in my country has reached more than 100 million tons. The iron content in the steel slag reaches 15%-20%, and the iron content in the steel slag discharged by the iron and steel industry reaches more than 15 million tons every year. According to the current calculation of 700-1000 yuan / ton of iron ore, the total value of idle iron raw materials will exceed 30 billion yuan every year. Steel slag has high iron content. If the iron in steel slag cannot be effectively removed, it will not only increase the difficulty of crushing and grinding steel slag, affect the quality of steel slag powder products, but also cause a lot of was...

AI Technical Summary

Problems solved by technology

Steel slag contains high iron content. If the iron in steel slag cannot be effectively removed, it will not only increase the difficulty of crushing and grinding steel slag, affect the quality of steel slag powder products, but also cause a lot of waste of iron resources.

[0003] Most steel slag treatment plants at home and abroad use simple roughing, or only grind slag with high iron content, and the recovery rate of steel materials is low. The iron content of the treated steel slag tailings is usually 2%-4%, and sometimes even reaches 5%. %above

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