Frozen-breaking method for steel slag

Abstract

The invention relates to a frozen-breaking method for steel slag. The frozen-breaking method for the steel slag comprises the following steps that first-time sorting is conducted on fed steel slag, and first steel slag and second steel slag are obtained; first-time ultra-rapid freezing is conducted on the second steel slag, the second steel slag is further broken into third steel slag, second-timesorting is conducted on the third steel slag, and fourth steel slag and fifth steel slag are obtained; magnetic separation is conducted on the fifth steel slag, and steel scrap and sixth steel slag are output in a distinguished mode; second-time ultra-rapid freezing is conducted on the sixth steel slag again, the sixth steel slag is broken into seventh steel slag, third-time sorting is conductedon the seventh steel slag, and the steps are cyclically conducted. According to the frozen-breaking method for the steel slag, the hardness and the brittleness of the steel slag are improved along with falling of the temperature according to the low-temperature cold brittleness of the steel slag, the steel slag is broken through a freezing mode, the steel slag becomes brittle when the environmenttemperature falls to a certain degree, the mechanical properties are changed, the breaking difficulty is greatly reduced, the breaking time is shortened, and the breaking efficiency is improved.

Description

technical field [0001] The invention relates to a treatment process for steelmaking waste, in particular to a method for freezing and crushing steel slag. Background technique [0002] Steel slag is the main solid waste in the steelmaking process. Based on the national steel production capacity of 800 million tons, 120 million tons of steelmaking steel slag is currently produced. However, the domestic steel slag treatment process is simple and extensive; usually after hot stuffing, cooling, and decomposition, large-diameter steel scrap and magnetic separation powder are sorted out; the tailings left are more than 20mm, accounting for more than 80% of the total treatment. Because it is not fully broken, it still contains about 4% elemental iron, and the content of many people even exceeds 5%. Moreover, the remaining tailings have serious problems of slag-coated iron and slag-iron solidification; due to the limitation of domestic technical level, the further processing of thi...

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Problems solved by technology

However, this process only focuses on selecting granular iron powder with an iron grade of more than 40% from the powder, and has not yet realized the comprehensive utilization of steel slag.

[0006] In addition, when the existing steel slag is crushed by the jaw crusher, the crushing effect is often poor, especially after crushing to a certain extent, the hammering effect of the fast rotating blade on the particles is already very small, making crushing difficult and time-consuming, and the steel slag is frozen and crushed. The method aims to solve the above-mentioned main problems and create economic value and social benefits through the comprehensive utilization of steel slag

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