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Method for preparing high-purity iron powder through iron oxide red

An iron red, high-purity technology, applied in the field of powder metallurgy production, can solve the problems of long production process, difficult operation and high cost, and achieve the effects of simple method conditions, low energy consumption and good metallurgical performance

Inactive Publication Date: 2018-03-02
JIUQUAN IRON & STEEL GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing high-purity iron powder from iron red to solve the problems of long production process of reduced iron powder, difficult operation in high temperature environment, high cost and high energy consumption in the existing powder metallurgy technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing high-purity iron powder from iron red, comprising the steps of:

[0032] Step 1, raw material preparation:

[0033] Sieve and mix the iron-containing raw material iron red, and use it as raw material below 0.1mm;

[0034] Step two, oxidation roasting:

[0035] Put the iron red powder obtained in step 1 into the trolley and enter the tunnel kiln or directly feed it into the rotary kiln for oxidative roasting, the material is spread flat, the roasting temperature is 600°C, and the roasting time is 30 minutes before leaving the kiln;

[0036] Step three, material cooling:

[0037] The kiln material obtained in the natural cooling step 2, the chloride ion content in the cooled material obtained is lower than 0.1%;

[0038] Step 4. Material recovery:

[0039] Spread the cooled material obtained in step 3 into the steel belt furnace, and pass in hydrogen for reduction. The reduction temperature is 800°C, and the reduction time is 60 minutes. After t...

Embodiment 2

[0044] A method for preparing high-purity iron powder from iron red, comprising the steps of:

[0045] Step 1, raw material preparation:

[0046] Sieve and mix the iron-containing raw material iron red, and use it as raw material below 0.1mm;

[0047] Step two, oxidation roasting:

[0048] Put the iron red powder obtained in step 1 into the trolley and enter the tunnel kiln or directly into the rotary kiln for oxidative roasting, the material is spread flat, the roasting temperature is 1000°C, and the roasting time is 120 minutes before leaving the kiln;

[0049] Step three, material cooling:

[0050] The kiln material obtained in the natural cooling step 2, the chloride ion content in the cooled material obtained is lower than 0.1%;

[0051] Step 4. Material recovery:

[0052] Spread the cooled material obtained in step 3 into the steel belt furnace, and pass in hydrogen for reduction. The reduction temperature is 1000°C, and the reduction time is 120 minutes. After the r...

Embodiment 3

[0057] Step 1, raw material preparation:

[0058] Sieve and mix the iron-containing raw material iron red, and use it as raw material below 0.1mm;

[0059] Step two, oxidation roasting:

[0060] Load the iron red powder obtained in step 1 into the trolley and enter the tunnel kiln or directly into the rotary kiln for oxidative roasting, the material is spread flat, the roasting temperature is 800°C, and the roasting time is 100 minutes before leaving the kiln;

[0061] Step three, material cooling:

[0062] The kiln material obtained in the natural cooling step 2, the chloride ion content in the cooled material obtained is lower than 0.1%;

[0063] Step 4. Material recovery:

[0064] Spread the cooled material obtained in step 3 into the steel belt furnace, and pass in hydrogen for reduction. The reduction temperature is 900°C, and the reduction time is 100 minutes. After the reduction is completed, it is cooled to 60°C in the steel belt furnace;

[0065] Step five, crushi...

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Abstract

The invention discloses a method for preparing high-purity iron powder through iron oxide red and belongs to the technical field of powder metallurgy production. The problems that as for reduced ironpowder production in an existing powder metallurgy technology, the technological process is long, operation is difficult in the high-temperature environment, the cost is high, and energy consumption is high are solved. The method comprises the steps of raw material preparation, oxidizing roasting, material cooling, material reduction, smashing and grading. When the iron oxide red is used for preparing the high-purity iron powder through the method, after the iron oxide red obtained by pickling of a carbon steel thin plate is subjected to oxidizing roasting pretreatment, the iron oxide red withthe iron grade being 60%-70% is reduced, reduced iron powder with the iron grade being 98% or above can be obtained, and the yield of iron powder reduction operation reaches 65% or above; according to the reduced iron powder, the silicon content is less than 0.15%, the carbon content is less than 0.02%, the apparent density is 2-3 g / cm<3>, and the flowability is 25-34 s / 50g. According to the method, the conditions are simple, energy consumption is low, the physical-chemical performance and metallurgical performance of the iron powder are good, and the reduction technological process is short.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy production, and in particular relates to a method for preparing high-purity iron powder from iron red. Background technique [0002] Iron red is one of the iron-containing by-products produced in the process of iron and steel production. The main chemical composition of iron red is Fe 2 o 3 , Fe 2 o 3 The content of iron powder reaches more than 98%, the purity is higher, and its particle size is finer, the specific surface area is larger, and the activity is extremely strong. The purpose of reduction can be achieved at a lower temperature. The obtained iron powder has physical, chemical and metallurgical properties. Huge advantage. But at present, except for the manufacture of pigments, the scope of use is not wide enough, and stockpiling is easy to cause environmental pollution. Contents of the invention [0003] The purpose of the present invention is to provide a method for pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F9/04
CPCB22F9/04B22F9/22
Inventor 刘千帆孙炳泉姜华吴霞宋治屛沈进杰秦彩霞高春庆
Owner JIUQUAN IRON & STEEL GRP
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