Method for second reduction and decarbonization of first reduced iron powder

A technology of reducing iron powder and decarburization, which is applied in the field of metallurgy, can solve problems such as unclean decarburization, high energy consumption, and difficult control of dew point, and achieve the effect of reducing procedures and broad application prospects

Inactive Publication Date: 2012-04-11
攀枝花鑫润矿业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two conventional decarburization methods have different degrees of disadvantages. The former needs to be kept warm for a certain period of time in a high-temperature nitrogen (air) environment, and the energy consumption is high; , if the dew point is low, the decarburization will not be clean

Method used

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  • Method for second reduction and decarbonization of first reduced iron powder
  • Method for second reduction and decarbonization of first reduced iron powder
  • Method for second reduction and decarbonization of first reduced iron powder

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1 Adopt the method of the present invention to carry out secondary reduction and decarburization of primary reduced iron powder

[0023] The primary reduced iron powder with a carbon content of 1.39 wt% was made to have a water content of 10 wt%, hydrogen was introduced, and the primary reduced iron powder was reacted with hydrogen at 810 ° C for 60 min, cooled, crushed and sieved to obtain secondary reduced iron powder .

[0024] The composition changes before and after reduction of iron powder are shown in Table 1.

Embodiment 2

[0025] Embodiment 2 Adopt the method of the present invention to carry out secondary reduction and decarburization of primary reduced iron powder

[0026] The primary reduced iron powder with a carbon content of 0.68 wt % is made to have a water content of 3.5 wt %, and decomposed ammonia gas is introduced to make the primary reduced iron powder react with the decomposed ammonia gas at 850 ° C for 30 minutes, and then cooled, crushed and sieved to obtain Secondary reduced iron powder.

[0027] The composition changes before and after reduction of iron powder are shown in Table 1.

[0028] Table 1 Composition changes before and after reduction of iron powder (wt%)

[0029]

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Abstract

The invention relates to a method for second reduction and decarbonization of first reduced iron powder, which belongs to the technical field of metallurgy and solves the technical problem. The lower energy consumption is realized in the method. The method for second reduction and decarbonization of first reduced iron powder comprises the following steps of: a, controlling water content of the first reduced iron powder to 3.5-10wt%; b, adding hydrogen gas or cracked ammonia gas, and fully reacting the first reduced iron powder with the hydrogen gas or the cracked ammonia gas at the temperature of 800-850 degrees centigrade; and c, cooling, breaking and sieving to obtain the second reduced iron powder.

Description

technical field [0001] The invention relates to a secondary reduction and decarburization method for primary reduced iron powder, and belongs to the technical field of metallurgy. Background technique [0002] In 2009, my country's iron powder production plants included 27 units in the production statistics (a dozen smaller ones were not counted), and the total output of iron powder was 294,700 tons. 137,000 tons of water atomized iron powder, 155,000 tons of reduced iron powder (including 119,000 tons of iron scale reduction, accounting for 40%, and 36,000 tons of ultra-pure ore powder reduction, accounting for 12%), using ultra-pure iron concentrate as raw material The average annual growth rate of the reduced iron powder is 25.7%, and the average annual growth rate of the reduced iron powder with iron scale as the raw material is 4.9%. With the development of powder metallurgy products in the direction of high density, high strength and complex shape, the requirements fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/22
Inventor 梁经冬段祁荣梁毅杨雪峰梁建昂王志敏
Owner 攀枝花鑫润矿业有限公司
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