A low-temperature reduction of iron ore-separation of slag and iron at normal temperature-electric furnace steelmaking process

A technology for separation of slag and iron and iron ore, applied in the direction of electric furnace, improvement of process efficiency, furnace, etc., to achieve the effects of less emissions, reduced environmental discharge pressure, and simple process

Active Publication Date: 2021-06-08
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, none of them can be compared with the currently commonly used "blast furnace-converter" process in terms of comprehensiveness.

Method used

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  • A low-temperature reduction of iron ore-separation of slag and iron at normal temperature-electric furnace steelmaking process

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Effect test

Embodiment 1

[0032] (1) After batching and mixing pellets with a particle size of 8-16mm or massive iron ore with a particle size of 10-30mm and residual carbon of 5-10mm at a ratio of 100:15, add them from the kiln inlet end of the rotary kiln. Under the action of high temperature in the rotary kiln, the temperature of the material gradually rises. When the temperature reaches 400-450°C, the iron ore begins to undergo reduction reaction with carbon, and when the temperature reaches 1000-1100°C, the reduction reaction proceeds violently.

[0033] (2) When the reduction reaction of iron ore in the high-temperature section of the rotary kiln progresses to the middle and late stages, the reduction reaction speed decreases. After the kiln is in contact with high-temperature materials, the coal can be pyrolyzed when the temperature reaches 500-900°C during the heating process at 600-800°C / min, and spongy residual carbon and by-product pyrolysis gas and tar can be obtained. It can be used as fue...

Embodiment 2

[0041] (1) After batching and mixing pellets with a particle size of 8-16mm or massive iron ore with a particle size of 10-30mm and residual carbon of 5-10mm at a ratio of 100:12, add them from the kiln inlet end of the rotary kiln. Under the action of high temperature in the rotary kiln, the temperature of the material gradually rises. When the temperature reaches 400-450°C, the iron ore begins to undergo reduction reaction with carbon, and when the temperature reaches 1000-1100°C, the reduction reaction proceeds violently.

[0042] (2) When the reduction reaction of iron ore in the high-temperature section of the rotary kiln progresses to the middle and late stages, the reduction reaction speed decreases. After the kiln is in contact with high-temperature materials, the coal can be pyrolyzed when the temperature reaches 500-900°C during the heating process at 600-800°C / min, and spongy residual carbon and by-product pyrolysis gas and tar can be obtained. It can be used as fue...

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Abstract

The invention relates to an iron ore low-temperature reduction-normal temperature slag-iron separation-electric furnace steelmaking process. During the reduction process of pellet or massive iron ore rotary kiln, low-rank coal is sprayed into the rotary kiln through compressed air. In the middle and late stage, coal is pyrolyzed into tar, pyrolysis gas and residual carbon during the rapid temperature rise process in the high temperature section. After selective reduction of the iron in the massive iron ore, the mixture of the reduced material and carbon residue is subjected to dry magnetic separation, and the carbon residue obtained is returned to the kiln material for recycling, and the metallized material obtained is recycled. After dry grinding, dry magnetic separation, iron powder briquetting, and electric furnace smelting, pure steel can be obtained. The present invention utilizes the tar, pyrolysis gas and residual carbon in the low-rank coal to the greatest extent, and only iron is reduced in the selective reduction process without reducing other elements, which lays the foundation for producing pure steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and mineral engineering, and relates to a process of low-temperature reduction of iron ore-separation of slag and iron at normal temperature-electric furnace steelmaking. Background technique [0002] The development of blast furnace ironmaking has a history of hundreds of years, and its technology has reached a fairly perfect level. Blast furnace ironmaking is mainly composed of coking, sintering, pelletizing, blast furnace and other processes. It is the leading process of modern iron and steel smelting and has the characteristics of large output and high product quality. However, while the iron coking production process is becoming more and more perfect and large-scale, it also brings problems such as long process, large investment and environmental pollution. Blast furnace ironmaking requires high-grade bulk or certain-sized charge, but with the rapid development of the iron and steel indus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/08C21C5/52
CPCC21B13/004C21B13/0066C21B13/0073C21B13/08C21C5/52Y02P10/20
Inventor 王明华权芳民王永刚张红军王建平寇明月张志刚雷鹏飞马胜军靳建毅邢德君卢红山仝敬佩沈忠
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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