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Technological process for producing reduced iron fine-powder

A process method and iron fine powder technology are applied in the field of secondary reduction iron powder production technology, which can solve problems such as high carbon content and inability to meet the technical requirements of iron fine powder, achieve low production cost, improve product quality, and process Reasonable effect of the process

Inactive Publication Date: 2009-03-11
北票新正粉末冶金有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the domestic production process of reduced iron powder, some of the sponge iron after primary reduction has a high carbon content, and the production of fine iron powder requires secondary reduction, that is, more than 98.5% of the primary reduced iron powder is reduced to Iron fine powder with a purity of more than 99.0%, but the iron fine powder obtained by a conventional reduction process has a high carbon content, usually more than 0.4%, which cannot meet the technical requirements of high-standard iron fine powder for carbon content. The direct pressing of the iron fine powder will affect the processing and performance of the product due to the high carbon content

Method used

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  • Technological process for producing reduced iron fine-powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put the primary reduced iron powder with a content of 98.5% into the steel belt-type iron fine powder reduction furnace, then heat the reduction furnace, and when the temperature rises to 800-850°C, feed the decomposed ammonia gas (liquid ammonia is pyrolyzed into 75 %H 2 +25%N 2 Mixed gas), continuously input iron powder and reducing gas at this reduction temperature, and control the flow rate of ammonia gas at 45-50m 3 / hour, and at the same time into the water vapor and hydrogen chloride gas, the flow rate is 5 ~ 7m 3 / hour, the mixing volume ratio of water vapor and hydrogen chloride gas is 1:0.1~0.2, the temperature of water vapor is 120~150°C, the dew point of decomposed ammonia gas is controlled at -30~-50°C, when the reduction reaction time reaches 3~4 hours , and continue to keep warm at 850° C. to 900° C. for 1 to 2 hours to obtain the final product.

Embodiment 2

[0012] Input the primary reduced iron powder with a content of 98.0% into the steel belt-type iron fine powder reduction furnace, and then heat the reduction furnace. When the temperature rises to 800-850°C, the decomposed ammonia gas (liquid ammonia is pyrolyzed into 75 %H 2 +25%N 2 Mixed gas), continuously input iron powder and reducing gas at this reduction temperature, and control the flow rate of ammonia gas at 45-50m 3 / hour, and at the same time into the water vapor and hydrogen chloride gas, the flow rate is 8 ~ 10m 3 / hour, the mixing volume ratio of water vapor and hydrogen chloride gas is 1:0.1~0.2, the temperature of water vapor is 120~150°C, the dew point of decomposed ammonia gas is controlled at -30~-40°C, when the reduction reaction time reaches 3~4 hours , and continue to keep warm at 850° C. to 900° C. for 1 to 2 hours to obtain the final product.

[0013] The list of product inspection results is as follows: (unit wt%)

[0014]

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Abstract

The invention discloses a technique for producing reduced iron concentrate powder. In the technique, decomposition ammonia gas is pumped into the iron powder reduced by one time in a reducing furnace at the temperature of 750 to 900 DEG C for reducing the iron powder into the iron concentrate powder. The method is technically characterized in that water vapor and chlorine hydride gas are pumped simultaneously when the decomposition ammonia gas is pumped; the pumped flux of the ammonia gas is 40 to 60m<3> / h; the controlled flux of the water vapor and the chlorine hydride gas are 5 to 10m<3> / h; the mixed volume ratio of the water vapor to the chlorine hydride gas is 1: 0.1 to 0.2. As the water vapor and the chlorine hydride gas are added into the reduced gas, the dew point of the decomposition ammonia gas is controlled within a certain range, thus being capable of reducing the carbon content of an iron concentrate product from the original content of more than 0.4 percent to a content below 0.02 percent; the technical flow is reasonable; the production cost is lower; the product quality is greatly improved.

Description

technical field [0001] The invention relates to a production method of reduced iron powder, in particular to a production process of secondary reduced iron powder. Background technique [0002] At present, in the domestic production process of reduced iron powder, some of the sponge iron after primary reduction has a high carbon content, and the production of fine iron powder requires secondary reduction, that is, more than 98.5% of the primary reduced iron powder is reduced to Iron fine powder with a purity of more than 99.0%, but the iron fine powder obtained by a conventional reduction process has a high carbon content, usually more than 0.4%, which cannot meet the technical requirements of high-standard iron fine powder for carbon content. The direct pressing of the iron fine powder will affect the processing and performance of the product due to the high carbon content. Contents of the invention [0003] The purpose of the present invention is to overcome the defects...

Claims

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Application Information

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IPC IPC(8): B22F9/22
Inventor 高振华张志华
Owner 北票新正粉末冶金有限公司
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