Iron ore low-temperature reduction-normal-temperature slag-iron separation-electric furnace steel making process

A technology for separation of slag and iron, iron ore, applied in electric furnace, process efficiency improvement, furnace and other directions

Active Publication Date: 2019-09-03
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Iron ore low-temperature reduction-normal-temperature slag-iron separation-electric furnace steel making process

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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 a iron ore low-temperature reduction-normal-temperature slag-iron separation-electric furnace steel making process. The process is characterized in that in a reduction processof a pellet ore or a lump iron ore in a rotary kiln, a low-coal-rank coal is sprayed into a middle rear section of the rotary kiln through compressed air, the coal is pyrolyzed into tar, pyrolysis gas and residual carbon in a rapid heating process of a high-temperature section, the pyrolysis gas is utilized as a reducing agent of a to-be-reduced material, the tar is used as a fuel for the rotarykiln, the pellet ore or the lump iron ore are subjected to selective reduction of iron in the pellet ore or lump iron ore, the reduced material and a residual carbon mixture are subjected to dry magnetic separation, the obtained residual carbon is returned and distributed to a kiln material for cyclic utilization, the obtained metalized materials are subjected to dry grinding, dry magnetic separation, iron powder briquetting and electric furnace smelting, so that pure steel can be obtained. According to the process, the tar, the pyrolysis coal gas and the residual carbon in the low-coal-rank coal are utilized to the maximum extent, only iron is reduced in the selective reduction process without reducing other elements, and a foundation is laid for preparing 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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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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