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Method for recovering metallic iron from carbon-containing converter steel slag

A technology of converter steel slag and metal iron, applied in the field of recycling metal iron resources, can solve the problems of not being comprehensively utilized and low recycling efficiency, and achieve the effects of good economy and practicability, convenient operation, and large particle size

Inactive Publication Date: 2022-01-28
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Steel slag is divided into converter steel slag, electric furnace steel slag and open hearth furnace steel slag. Most of the steel slag produced at present is converter steel slag. Among them, the iron grade of converter steel slag produced by JISCO Group is as high as 20-22%, and the annual production is about 560,000 tons. There are metallurgical slag factories, and the recycling efficiency is very low. Only a small amount of large granular iron is used for the sintering process and steelmaking process, and it has not been well comprehensively utilized at present.

Method used

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  • Method for recovering metallic iron from carbon-containing converter steel slag

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Effect test

Embodiment 1

[0025] S1: Sieve, take 25kg of converter steel slag with a grade of 21.5% of wine iron and steel, separate large pieces of slag and iron by using an iron remover, and obtain 24.78kg of converter steel slag from which large pieces of slag and iron have been removed, wherein the particle size of large pieces of slag and iron is ≥100mm, and The separated bulk slag has a high grade of iron and iron and can be directly recycled as concentrate.

[0026] S2: primary crushing, the converter steel slag that removes large slag iron in S1 is crushed by a jaw crusher, so that the particle size of the broken converter steel slag is below 10mm;

[0027] S3: A magnetic separation, the converter steel slag obtained in S2 with a particle size below 10mm is subjected to dry magnetic separation with a belt-type permanent magnetic drum to obtain 5.45 kg of magnetic coarse slag and 19.33 kg of weak magnetic tailings; the belt-type permanent magnetic drum The surface magnetic induction is 0.13T, an...

Embodiment 2

[0033] S1: Screening, take 30kg of converter steel slag with a grade of 22% of wine iron and steel, and separate the bulk slag and iron by using the iron remover to obtain 29kg of converter steel slag with the bulk slag and iron removed, wherein the particle size of the bulk slag and iron is ≥100mm, and separate The large slag produced has a high content of iron and iron, and can be directly recycled as a concentrate.

[0034] S2: primary crushing, the converter steel slag that removes large slag iron in S1 is crushed by a jaw crusher, so that the particle size of the broken converter steel slag is below 10mm;

[0035] S3: A magnetic separation, the converter steel slag obtained in S2 with a particle size of less than 10mm is subjected to dry magnetic separation with a belt-type permanent magnetic drum to obtain 6.38kg of magnetic coarse slag and 22.62kg of weak magnetic tailings; the belt-type permanent magnetic drum The surface magnetic induction intensity is 0.13T, and the ...

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Abstract

The invention relates to a method for recycling metallic iron resources from steel industry waste residues, in particular to a method for recycling metallic iron from carbon-containing converter steel slag. The converter steel slag is subjected to the technological processes of screening, primary crushing, primary magnetic separation, smelting, secondary crushing and secondary magnetic separation, and the iron grade in the converter steel slag can be enriched from 20-22% to 80% or above. The method has the advantages of being high in metal iron recovery rate and grade, simple in technological process, convenient to operate, low in production cost, suitable for treating various converter steel slag and the like.

Description

technical field [0001] The invention relates to a method for recovering metallic iron resources from steel industry waste slag, in particular to a method for recovering metallic iron from carbon-containing converter steel slag. Background technique [0002] As a derivative of the steelmaking process, steel slag is continuously increasing with the increase of steel production, and the amount of slag produced per ton of steel is about 10-15% of the steel. The utilization rate of my country's steel slag is only about 25%, and the domestic stacking volume has reached hundreds of millions of tons. Steel slag is divided into converter steel slag, electric furnace steel slag and open hearth furnace steel slag. Most of the steel slag produced at present is converter steel slag. Among them, the iron grade of converter steel slag produced by JISCO Group is as high as 20-22%, and the annual production is about 560,000 tons. There are metallurgical slag factories, and the recycling eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/10C22B1/00C21C5/28
CPCC21B11/10C22B1/005C21C5/28C21C2200/00Y02P10/20
Inventor 张双爱刘金长王友胜王小平
Owner JIUQUAN IRON & STEEL GRP
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