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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So as to solve the problems of waste o

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

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Example Embodiment

[0030] Example 1

[0031] Sieving low-grade (total iron content 18%) and small particle size (below 10mm) steel slag. While sieving, 5-10mm steel slag particles are subjected to dry magnetic separation, and 5-10mm steel slag particles are scrap iron. The recovery rate is 18%. The recycled scrap iron (40% total iron content) is metallurgically reused. Steel slag particles with a total iron content below 10% are used as coarse aggregates for standard bricks and porous bricks.

[0032] The steel slag below 5mm and the water are in a weight ratio of 1:0.6, and two thousandths of the total weight of the water reducing and grinding aid are mixed and added to the wet ball mill for ball milling. After ball milling until the slurry fineness reaches 0.08mm square hole sieve and the sieve is less than 15%, the iron can be separated from the grinding, and the steel slag slurry is discharged into the double-bin magnetic separator for iron separation. The iron powder recovery rate after cleanin...

Example Embodiment

[0037] Example 2

[0038] Sieving low-grade (total iron content 20%) and small particle size (below 10mm) steel slag. While sieving, 5-10mm steel slag particles are subjected to dry magnetic separation for iron separation, and 5-10mm steel slag particles are scrap iron. The recovery rate is 19.5%. The recovered scrap iron (42% total iron content) is metallurgically reused. Steel slag particles with a total iron content below 10% are used as coarse aggregates for standard bricks and porous bricks.

[0039] The steel slag below 5mm and water are in a weight ratio of 1:0.6, plus two thousandths of the total weight of water reducing and grinding aids are mixed into the wet ball mill for ball milling, ball milling until the slurry fineness reaches 0.08mm square hole sieve sieve Less than 15% can be used for grinding iron, and the steel slag slurry is discharged into the double-bin magnetic separator for iron separation. The iron powder recovery rate after cleaning is 13%, the total iro...

Example Embodiment

[0044] Example 3

[0045] Sieving low-grade (total iron content 16%) and small particle size (below 10mm) steel slag. While sieving, 5-10mm steel slag particles are subjected to dry magnetic separation, and 5-10mm steel slag particles are scrap iron. The recovery rate is 17%. The recovered scrap iron (total iron content of 38%) is metallurgically reused, and steel slag particles with a total iron content of less than 10% are used as coarse aggregates for the production of standard bricks and porous bricks.

[0046] The steel slag below 5mm and water are in a weight ratio of 1:0.6, plus two thousandths of the total weight of water reducing and grinding aids are mixed into the wet ball mill for ball milling, ball milling until the slurry fineness reaches 0.08mm square hole sieve sieve Less than 15% can be used for grinding iron, and the steel slag slurry is discharged into the double-bin magnetic separator for iron separation. The iron powder recovery rate after cleaning is 10%, the...

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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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