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Low grade tailing steel slag re-use method and slurry magnetic separation equipment

A low-grade, steel slag technology, applied in clay processing equipment, chemical instruments and methods, magnetic separation, etc., can solve problems such as waste of resources, environment, pollution, etc., and achieve outstanding economic and social benefits.

Inactive Publication Date: 2009-03-25
中冶武汉冶金建筑研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So as to solve the problems of waste of resources and environmental pollution

Method used

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  • Low grade tailing steel slag re-use method and slurry magnetic separation equipment
  • Low grade tailing steel slag re-use method and slurry magnetic separation equipment
  • Low grade tailing steel slag re-use method and slurry magnetic separation equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Sieve low-grade (total iron content 18%) steel slag with small particle size (less than 10mm), and at the same time, carry out dry magnetic separation of steel slag particles with a size of 5-10mm, and iron slag particles with a size of 5-10mm The recovery rate is 18%, and the recovered scrap iron (40% total iron content) is metallurgically reused, and the steel slag particles with a total iron content below 10% are used as coarse aggregate for the production of standard bricks and porous bricks.

[0032] The steel slag below 5mm and water are mixed in a weight ratio of 1:0.6, plus 2 / 1000 of the total weight of water-reducing grinding aid, and added to a wet ball mill for ball milling. Ball mill until the slurry fineness reaches 0.08mm square hole sieve and the sieve residue is less than 15%, then the iron can be milled and separated, and the steel slag slurry is discharged into the double-chamber magnetic separator for iron separation. The recovery rate of iron powder a...

Embodiment 2

[0038] Sieve low-grade (total iron content 20%) steel slag with small particle size (below 10mm), and at the same time, carry out dry magnetic separation of 5-10mm steel slag particles for iron separation, and 5-10mm steel slag particles for scrap iron The recovery rate is 19.5%. The recovered scrap iron (42% total iron content) is reused in metallurgy, and the steel slag particles with a total iron content below 10% are used as coarse aggregate for standard bricks and porous bricks.

[0039] The steel slag below 5mm and water are mixed according to the weight ratio of 1:0.6, plus 2 / 1000 of the total weight of the water-reducing grinding aid and added to the wet ball mill for ball milling until the fineness of the slurry reaches 0.08mm. If it is less than 15%, it can be used for grinding and selecting iron, and the steel slag slurry is discharged into the double-chamber magnetic separator for iron selection. After cleaning, the recovery rate of iron powder is 13%, and the total...

Embodiment 3

[0045] Sieve low-grade (total iron content 16%) steel slag with small particle size (less than 10mm), and at the same time, carry out dry magnetic separation of 5-10mm steel slag particles for iron separation, and 5-10mm steel slag particles for scrap iron The recovery rate is 17%, and the recovered scrap iron (38% total iron content) is reused for metallurgy, and the steel slag particles with a total iron content below 10% are used as coarse aggregate for producing standard bricks and porous bricks.

[0046] The steel slag below 5mm and water are mixed according to the weight ratio of 1:0.6, plus 2 / 1000 of the total weight of the water-reducing grinding aid and added to the wet ball mill for ball milling until the fineness of the slurry reaches 0.08mm. If the percentage is less than 15%, it can be used for grinding and selecting iron, and the steel slag slurry is discharged into the double-chamber magnetic separator for iron selection. The recovery rate of iron powder after cl...

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Abstract

The invention discloses a method for reutilization of low-grade after-product steel slag and a magnetic plant thereof, relating to a method for comprehensively utilizing the steel slag. The method comprises the sequential steps as follows: the low-grade after-product steel slag is screened, magnetically selected and ball-grinded by wet-method; the magnetically selected steel slag slurry is mixed with blast-furnace slag powder, plaster powder, cement and precocious digester as steel slag slurry mixture; the steel slag slurry mixture is mixed by compounding with one or more matters out of steel slag aggregate, crushed stone, sand, water and gas former aluminium powder so as to prepare porous bricks or standard bricks or pre-mixing mortar or aerated concrete block. The method can use a plurality of low-grade after-product steel slag, realizes the diversification of product, has large usage quantity and zero exhaust of the steel slag and is a good method for comprehensive utilization.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing steel slag, especially a method for comprehensively utilizing low-grade tailing steel slag with a small particle size below 10 mm. The invention also relates to a magnetic separation device for steel slag slurry. Background technique [0002] Steel slag is a by-product of the steelmaking process and has become one of the major solid wastes in the steel industry. Its occurrence is closely related to metallurgical technology and equipment level. Industrial developed countries mostly adopt less-slag and slag-free steelmaking processes, but due to relatively backward production technology and low-quality raw materials in my country, the amount of slag produced in steelmaking is relatively large, and 150-200 kg of slag is discharged per ton of steel produced. According to statistics, in 1994, my country's annual discharge of steel slag was about 14 million tons, of which converter steel slag a...

Claims

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Application Information

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IPC IPC(8): B28C1/18B28C1/20B03C1/10B28C5/00B28C7/06
Inventor 蔡雪军张建武朱群洲曾明李君陈晶王崇英
Owner 中冶武汉冶金建筑研究院有限公司
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