Reduction method of iron ore powder

A technology of iron ore powder and reduction furnace, which is applied in the field of iron ore powder reduction, can solve the problems of high energy consumption, cumbersome process, and high production cost, and achieve the effects of uniform particle size distribution, green environmental protection resources, and low production cost

Pending Publication Date: 2021-06-18
安徽马钢粉末冶金有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional reduction method generally adopts the preparation process of two-stage reduction, that is, the first reduction in the tunnel kiln and the second reduction in the fine reduction furnace. Put it into the SiC tank, use tunnel kiln gas to burn and heat to 1100-1200 ℃ for reduction, the whole initial reduction process takes about 6 days, high energy loss, low collection and utilization of excess heat energy, cumbersome process, and high production cost
In addition, excessive carbon and sulfur oxides and particulates produced by combustion are likely to cause environmental pollution, and the solid waste treatment process is long and energy-consuming

Method used

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  • Reduction method of iron ore powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] according to figure 1 The technological process shown, with 5 tons of iron concentrate powder, iron concentrate powder: TFe 72.1% (mainly Fe 2 o 3 ), Mn 0.088%, Si 0.053%, P 0.0039%, C 0.012%, S 0.040%; hydrochloric acid insoluble matter 0.30%; the remaining impurities are dried, and a reduction process is carried out in a steel belt reduction furnace. , the hydrogen flow rate is 39m 3 / h, the temperature is 820°C, the time is 4.5h, the belt speed is 110mm / s, the material thickness is 20mm, and after a stage of reduction, a stage of powder cake is obtained;

[0057] After one section of powder cake is broken and crushed, one section of reduced iron powder (element composition is (TFe84.12%, H 损 13.9%, Mn 0.087%, Si 0.052%, P 0.0039%, C 0.008%, S 0.035%, hydrochloric acid insoluble matter 0.20%; impurity balance);

[0058] The first-stage reduced iron powder is subjected to the second-stage reduction in the steel belt reduction furnace. During the second-stage reduct...

Embodiment 2

[0063] according to figure 1 The technological process shown, with 5 tons of iron concentrate powder (element composition is TFe 71.5%, Mn0.090%, Si0.055%, P 0.0040%, C 0.012%, S 0.030%; Hydrochloric acid insolubles 0.5%; amount) after drying, carry out a stage of reduction in the steel belt reduction furnace. During the stage of reduction, the hydrogen flow rate is 39m 3 / h, the temperature is 810°C, the time is 4.5h, the belt speed is 110mm / s, the material thickness is 20mm, after a stage of reduction, a stage of powder cake is obtained;

[0064] After a section of powder cake is disintegrated and broken, a section of reduced iron powder (element composition is (TFe82.12%, H 损 12.9%, Mn 0.087%, Si 0.054%, P 0.0035%, C 0.006%, S 0.035%; hydrochloric acid insoluble matter 0.20%; impurity balance);

[0065] The first-stage reduced iron powder is subjected to the second-stage reduction in the steel belt reduction furnace. During the second-stage reduction process, the hydrogen...

Embodiment 3

[0070] according to figure 1 The technological process shown, with 5 tons of iron concentrate powder (element composition is TFe 72.1%, Mn0.078%, Si0.050%, P 0.0039%, C 0.012%, S 0.038%; Hydrochloric acid insoluble matter 0.30%; amount) after drying, carry out a stage of reduction in the steel belt reduction furnace. During the stage of reduction, the flow rate of hydrogen is 39m 3 / h, the temperature is 830°C, the time is 4.5h, the belt speed is 110mm / s, the material thickness is 20mm, after a stage of reduction, a stage of powder cake is obtained;

[0071] After one section of powder cake is broken and crushed, one section of reduced iron powder (element composition is (TFe84.12%, H 损12.9%, Mn 0.080%, Si 0.050%, P 0.0039%, C 0.008%, S 0.035%; hydrochloric acid insoluble matter 0.20%; impurity balance);

[0072] The first-stage reduced iron powder is subjected to the second-stage reduction in the steel belt reduction furnace. During the second-stage reduction process, the f...

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Abstract

The invention belongs to the technical field of production of reduced iron powder, and particularly relates to a reduction method of iron ore powder. The reduction method of the iron ore powder comprises the following steps that under the hydrogen atmosphere, the iron ore powder is sequentially subjected to first-stage reduction, second-stage reduction and third-stage reduction, and reduced iron powder is obtained; the temperature of the first-stage reduction is 810-830 DEG C; the temperature of the second-stage reduction is 920-940 DEG C; and the temperature of the third-stage reduction is 945-960 DEG C. According to the reduction method of the iron ore powder, the hydrogen atmosphere is used as a reduction medium, the temperature in the production process is low, the whole reduction process is environmentally friendly, resources are saved, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of reduced iron powder production, and in particular relates to a method for reducing iron ore powder. Background technique [0002] With the continuous development of powder metallurgy technology, the amount of iron-based powder is increasing. The production methods of reduced iron powder at home and abroad mainly include reduction method, electrolysis method, atomization method and mechanical pulverization method. Among them, the reduction method is low in cost, large in output and suitable in performance, and is widely used in the industrial production of reduced iron powder. Iron powder is produced by reduction method. [0003] The traditional reduction method generally adopts the preparation process of two-stage reduction, that is, the first reduction in the tunnel kiln and the second reduction in the fine reduction furnace. Put it into a SiC tank, use tunnel kiln gas to burn and heat to 1100-1200°C f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 唐木生陈国鹏吴金泉姚学军黄峰赵宗海何豪
Owner 安徽马钢粉末冶金有限公司
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