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Method for reducing iron by smelting reduction in electrometallurgy

A technology of reducing iron and reducing agent, which is applied in the field of smelting reduced iron, can solve the problems of lack of high-grade and high-quality iron ore resources, many impurities, and increased production costs, and achieve compact layout of process equipment, short process flow, and reduced use volume effect

Active Publication Date: 2012-05-02
KUNMING IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Blast furnace ironmaking is a relatively mature ironmaking method at present. It has the characteristics of simple process, large output, high labor productivity and low energy consumption. The disadvantage is that it has high requirements for ore grade. In particular, my country is a country that is poor in iron ore, and there is a serious lack of high-grade and high-quality iron ore resources. Many large-scale iron and steel enterprises have to import ore raw materials, which brings about the problem of rising ore prices and increasing production costs, which seriously interferes Healthy Development of Iron and Steel Industry
The existing smelting reduction iron methods are mainly smelting reduction technologies represented by Corex, Finex, and Hismelt. COREX is the first to realize industrial production and the most mature technology, but it still has its shortcomings, such as low productivity, coal consumption, oxygen consumption, etc. Compared with the existing advanced blast furnace ironmaking, it still lacks competitiveness
In addition, most of the iron ores mined in my country are of low grade and contain many impurities, so they cannot be directly smelted in blast furnaces, thus forming a low-grade threshold for blast furnace ironmaking.

Method used

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  • Method for reducing iron by smelting reduction in electrometallurgy
  • Method for reducing iron by smelting reduction in electrometallurgy
  • Method for reducing iron by smelting reduction in electrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A. After pulverizing and sieving the reducing agent—coke, the coke with a particle size of 3 to 25mm on the sieve is sent into the heating rotary kiln. The amount of feeding is 18% of the quality of the ore entering the kiln. ) is: C: 86, Af: 2.5, Vf: 15, H 2 O: 9.8, the coke under the sieve with a particle size of less than 3mm is pressed into balls by a conventional ball press machine, and then sent to the heating rotary kiln;

[0028] B. The chemical composition (Wt%) is: TFe: 43, P: 0.08, S: 0.20, As: 0.016, SiO 2 : 8.00, CaO+MgO: 8, H 2 O: The ore of 9.06 is crushed and screened. The ore with a particle size of 10-80mm on the sieve is sent to the heating rotary kiln. The ore with a particle size of less than 10mm under the sieve is pressed into balls by a conventional ball press machine, and then sent to the heating. in the rotary kiln;

[0029] C. After crushing and sieving the flux-lime, the lime with a particle size of 10-80mm on the sieve is sent to the heat...

Embodiment 2

[0034] A. After pulverizing and sieving the reducing agent—coal, the coal with a particle size of 3-25mm on the screen is sent into the heating furnace, and the feeding amount is 25% of the ore mass, and the coal with a particle size of less than 3mm under the screen is conventionally After being pressed into balls, it is sent into the heating furnace. The chemical composition (Wt%) of the coal is: C: 81, Af: 1.78, Vf: 13.5, H 2 O: 7.96;

[0035] B. The chemical composition (Wt%) is: TFe: 45, P: 0.07, S: 0.17, As: 0.012, SiO 2 : 6.55, CaO+MgO: 3, H 2 O: The ore of 7.86 is crushed and screened. The ore with a particle size of 10-80mm on the sieve is sent to the heating furnace, and the fine ore with a particle size of less than 10mm under the sieve is pressed into balls according to the conventional method, and then sent to the heating furnace;

[0036] C. After crushing and sieving the flux—limestone and silica, the limestone and silica with a particle size of 10-80mm on the...

Embodiment 3

[0041] A. After pulverizing and sieving the reducing agent—coal and coke, the coal and coke with a particle size of 3-25mm on the sieve are sent into the heating rotary kiln, and the feeding amount is 15% of the ore mass. The 3mm coal and coke powder are pressed into balls according to the routine, and then sent to the heating rotary kiln. The chemical composition (Wt%) of the coal is: C: 81, Af: 1.78, Vf: 13.5, H 2 O: 7.96, the chemical composition of coke is: C: 85, Af: 1.6, Vf: 12, H 2 0:9.25;

[0042] B. The chemical composition (Wt%) is: TFe: 52, P: 0.09, S: 0.16, As: 0.015, SiO 2 : 7.87, CaO+MgO: 3.56, H 2 O: The ore of 7.56 is crushed and screened. The ore with a particle size of 10-80mm on the sieve is directly sent to the rotary kiln, and the fine ore with a particle size of less than 10mm under the sieve is pressed into balls according to the conventional method, and then sent to the heating rotary kiln;

[0043] C. After pulverizing and sieving the flux—lime, lim...

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Abstract

The invention provides a method for reducing iron by smelting reduction in electrometallurgy. The method is characterized by taking electric energy as a heat source and natural ore or artificial ore, carbonaceous reducing agent and solvent as raw materials and comprising the following steps: pre-reducing the raw materials at the temperature of 700 to 900 DEG C for 4 to 6 h; heating to 1,400 to 1,700 DEG C in an electric furnace so as to smelt the furnace burden and reduce into molten iron and slag, and discharging the molten iron and slag to a foundry ladle; meanwhile, dedusting the smoke dust during the smelting, wherein the smoke is returned to a pre-reducing device and used as reducing gas; the smoke dust is used for manual granulation and recycled; the molten iron is cast and formed or directly used for steelmaking; and the slag is processed for other purposes. The method has the advantages of simple process and equipment, little occupation, low requirements on raw materials, wideapplicable range, low sulphur load of produced molten iron compared with molten iron of a blast furnace and good product quality, while saving investment and resources without needing equipment for coking, sintering and the like or using coke as fuel.

Description

technical field [0001] The invention relates to a method for smelting and reducing iron, in particular to using electric energy as a heat source, using natural ore, carbonaceous reducing agent, and flux as raw materials to carry out decomposition, slagging, reduction of metal oxides, infiltration of molten iron Carbon and other smelting processes to finally obtain molten iron. Background technique [0002] Blast furnace ironmaking is a relatively mature ironmaking method at present. It has the characteristics of simple process, large output, high labor productivity and low energy consumption. The disadvantage is that it has high requirements for ore grade. In particular, my country is a country that is poor in iron ore, and there is a serious lack of high-grade and high-quality iron ore resources. Many large-scale iron and steel enterprises have to import ore raw materials, which brings about the problem of rising ore prices and increasing production costs, which seriously in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/10
CPCY02P10/20
Inventor 李幼灵唐启荣赵明生许江浩刘明生谢君相张良忠张九皋赵宇王涛朱锡森宋俊宝姜德俊李成昆宁勐
Owner KUNMING IRON & STEEL GRP CO LTD
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