Stainless steel slag treatment method

Abstract

The invention relates to a stainless steel slag treatment method, which comprises the following steps of: (1) adding a modifier: adding a boron modifier into steel slag in the deslagging process; (2) cooling: cooling the steel slag added with the boron modifier to the temperature of below 80DEG C; and (3) grading for multiple times: (31) primarily grading: primarily grading the steel slag into three kinds of steel slag with coarse particles, medium particles and fine particles, applying a first magnetic field to the medium steel slag to separate the medium steel slag into a ferrite slag steel product and mixed waste slag, mixing the fine steel slag and the mixed waste slag obtained through separation in the step (313), applying a second magnetic field to separate into a ferrite slag steel product and mixed waste slag, and separating the mixed waste slag into an austenite slag steel product and mixed waste slag through a spectrograph. By the method, tank cooling and dry-process treatment in the whole process of slag modification, steel slag cooling, crushing, metal sorting and the like is realized, and the energy conservation and emission reduction requirements of iron and steel enterprises are met.

Description

technical field [0001] The invention relates to a method for treating stainless steel slag. Background technique [0002] The steel slag produced in the stainless steel production process has the characteristics of high alkalinity, easy pulverization during the cooling process, and weak magnetic properties of the slag and steel, which are difficult to separate. Moreover, there are many types of stainless steel slag with different composition properties. , tailings utilization are difficult problems in the field of iron and steel. All countries in the world are researching cooling and treatment issues according to the characteristics of stainless steel slag. For the cooling and treatment of stainless steel slag, the traditional methods are mainly hot pouring method and wet method. Although the hot-splashing method can effectively cool down the steel slag, the dust in the process is serious and the floor area is large, and the metal in the steel slag can only be roughly sele...

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Problems solved by technology

[0003] In order to solve the problems of high energy consumption, non-environmental protection, and large floor space for the treatment of stainless steel slag, the present invention proposes a treatment method for stainless steel slag, that is, a boron modifier is added during the slag discharge process of stainless steel slag, and after cooling, after Screening after three-stage crushing, and then three-stage high-strength magnetic separation and metal induction to select steel slag and tailings with different particle sizes

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