Method for reducing iron tailings and enriching tail concentrate by taking steel slag as additive

A technology for pre-enrichment and reduction of iron is applied in the field of comprehensive utilization of resources to achieve the effects of quality reduction, energy saving and simple process method.

Inactive Publication Date: 2015-04-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for reducing iron tailings and enriching tail concentrate by taking steel slag as additive
  • Method for reducing iron tailings and enriching tail concentrate by taking steel slag as additive

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Embodiment 1

[0024] A steel slag contains 12.22% of silicon dioxide, 35.82% of calcium oxide, 11.00% of magnesium oxide, 6.84% of aluminum oxide and 19.37% of total iron. The steel slag is dried and crushed, so that the particle size of the crushed steel slag is -2mm, wherein the steel slag with a particle size of -1mm accounts for 92%, and the steel slag with a particle size of -0.1mm accounts for 56%. Using iron tailings pre-enriched tailings concentrate as raw material, adding steel slag with a quaternary alkalinity of 0.4 as an additive, 15% bituminous coal as a reducing agent, and 0.4% sodium carboxymethylcellulose as a binder, and then Mix evenly to make mixed raw meal; add 7% water to the mixed raw meal and mix evenly again, and then press balls in the briquetting equipment to make green pellets; dry the made green pellets, and then Put it into a reducing atmosphere furnace for rapid reduction, the reduction temperature is 1350°C, and the reduction time is 30 minutes. The product ob...

Embodiment 2

[0026] A steel slag contains 11.60% silicon dioxide, 41.80% calcium oxide, 10.08% magnesium oxide, 1.43% aluminum oxide and 22.08% total iron. The steel slag is dried and crushed, so that the particle size of the crushed steel slag is -2mm, wherein the steel slag with a particle size of -1mm accounts for 92%, and the steel slag with a particle size of -0.1mm accounts for 56%. Using iron tailings pre-enriched tailings concentrate as raw material, adding steel slag with a quaternary alkalinity of 0.3 as an auxiliary agent, 25% bituminous coal as a reducing agent, and 0.5% sodium carboxymethylcellulose as a binder, and then Mix evenly to make mixed raw meal; add 8% water to the mixed raw meal and mix evenly again, and then press balls in the briquetting equipment to make green pellets; dry the made green pellets, and then Put it into a reducing atmosphere furnace for rapid reduction, the reduction temperature is 1350°C, and the reduction time is 40 minutes. The product obtained a...

Embodiment 3

[0028]A steel slag contains 12.22% of silicon dioxide, 35.82% of calcium oxide, 11.00% of magnesium oxide, 6.84% of aluminum oxide and 19.37% of total iron. The steel slag is dried and crushed, so that the particle size of the crushed steel slag is -2mm, wherein the steel slag with a particle size of -1mm accounts for 92%, and the steel slag with a particle size of -0.1mm accounts for 56%. Using iron tailings pre-enriched tailings concentrate as raw material, adding steel slag with a quaternary alkalinity of 0.4 as an auxiliary agent, 25% bituminous coal as a reducing agent, and 0.5% sodium carboxymethylcellulose as a binder, and then Mix evenly to make mixed raw meal; add 9% water into the mixed raw meal and mix evenly again, and then press balls in the briquetting equipment to make green pellets; dry the made green pellets, and then Put it into a reducing atmosphere furnace for rapid reduction, the reduction temperature is 1325°C, and the reduction time is 40 minutes. The pr...

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Abstract

The invention provides a method for reducing iron tailings and enriching tail concentrate by taking steel slag as an additive and belongs to the technical field of comprehensive utilization of resources. The method for reducing iron tailings and enriching tail concentrate by taking steel slag as additives comprises the following main steps: drying and crushing the steel slag, taking the pre-enriched tail concentrate of the iron tailings as the raw material, taking the steel slag as an additive, adding a reducing agent, an adhesive and water to press balls and generate green pellets, putting the green pellets into a reduction atmosphere furnace to quickly reduce and prepare reduction pellets; naturally the reduction pellets, then crushing, grinding ore in two stages and carrying out two stages of magnetic separation to finally obtain reduction iron micro powder with a metallization ratio greater than or equal to 87%, an iron grade greater than or equal to 90% and an iron recovery ratio greater than or equal to 85%. According to the method, the steel slag discharged out of a steel plant is used as the additive, so that industrial or chemical pure additives such as calcium oxide and sodium carbonate are completely replaced; the reduction cost is remarkably reduced; the steel slag is used as the additive for reducing the iron tailings and enriching tail concentrate; the iron in the pre-enriched tail concentrate of the iron tailings can be recycled; the residual iron in the steel slag can be recycled; the economic benefit and social benefit are quite obvious.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a method for reducing iron tailings and pre-enriching tailings concentrate by using steel slag as an auxiliary agent. Background technique [0002] Qidashan Iron Mine is one of the main raw material bases of Ansteel Group. Its iron ore is mainly red ore of magnetite quartzite, which is extremely difficult to select iron ore. After more than 40 years of development, the current tailings stockpile has exceeded 200 million tons. The iron grade in the early iron tailings is high, up to about 20%, which has huge potential recovery value. Therefore, the comprehensive utilization research of Qidashan iron tailings was carried out, see the patent "A method for iron ore tailings strong magnetic pre-enrichment and deep reduction iron extraction" (CN201210362689). By pre-enrichment of Qidashan iron tailings, a pre-enrichment tailing concentrate with an iron g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/16B03C1/00B03C1/015
Inventor 倪文范敦城王健月李媛
Owner UNIV OF SCI & TECH BEIJING
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