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Iron making method using direct reduction-grinding screening to treat copper slag and nickel slag

A copper slag, direct technology, applied in the ironmaking field of direct reduction-grinding treatment of copper slag and nickel slag, can solve problems such as lack of advantages

Inactive Publication Date: 2009-12-02
吴道洪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its characteristics and other reasons, its various technical and economic indicators have no advantages compared with conventional blast furnace ironmaking methods, whether gravity extraction, flotation, magnetic separation, magnetization roasting, or smelting and smelting are used to extract iron.

Method used

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  • Iron making method using direct reduction-grinding screening to treat copper slag and nickel slag

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specific Embodiment

[0026] Mix the copper slag containing 40% iron in a certain place according to the ratio of copper slag: coal: limestone = 100: 20: 15, put it into the rotary hearth furnace and roast it for 30 minutes, then immediately immerse it in water to cool it, and go through crushing and magnetic separation. After agglomeration, a direct reduced iron block containing 94% of iron and 1.5% of copper is obtained, and the yield of iron in the copper slag is 90%. For every ton of iron block produced, 2.5 tons of copper slag, 0.375 tons of limestone, 0.75 tons of fuel and 400kwh of electricity are consumed.

[0027] In the present invention, the high-temperature reduction process of the rotary hearth furnace is used to reduce the iron in the copper slag or nickel slag, and after quenching, the difference in expansion coefficient between the iron crystal and the gangue is used to loosen the combination of the two, and then wet Grinding and analysis; using oxygen-deficient high-temperature exh...

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Abstract

The invention discloses an iron making method using direct reduction-grinding screening to treat copper slag and nickel slag, which comprises the following steps: firstly mixing a proper amount of coal, copper slag or nickel slag and a fusing agent to make balls; drying the balls; distributing the green balls in a rotary hearth furnace; heating the green balls to 1,100 to 1,350 DEG C; keeping the temperature for 15 to 40 minutes; directly delivering 600 to 1,100 degree centigrade high temperature reducing iron material into water for cooling; performing fine grinding screening; and drying the fine grinding-screened iron material with high temperature oxygen-losing waste gas and briquetting to form blocky iron materials. The method is simple in process, short in flow, high in efficiency, free from coking coal needs and suitable for treating the copper slag and the nickel slag.

Description

technical field [0001] The invention relates to a direct reduction ironmaking method of iron and steel smelting technology, in particular to an ironmaking method for direct reduction-grinding treatment of copper slag and nickel slag. Background technique [0002] The blast furnace ironmaking method is a commonly used ironmaking technology in the prior art. However, in the prior art, there is no good technical method for iron elements in the copper slag and nickel slag formed by smelting copper or nickel. Most of the copper slag and nickel slag are stored as waste slag, occupying a large amount of land resources and causing serious pollution. environment. [0003] Minerals in copper slag and nickel slag are artificial minerals, which are very different from natural minerals in terms of shape and physical and chemical properties. Due to its characteristics and other reasons, its various technical and economic indicators have no advantages compared with conventional blast fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08
Inventor 吴道洪
Owner 吴道洪
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