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Preparation method of micron order spherical iron powder

A micron-scale, spherical technology, applied in the field of powder metallurgy, can solve the problems of complex production process, high production cost, large equipment investment, etc., and achieve the effect of reducing environmental load, less impurities and high purity

Active Publication Date: 2018-08-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the production method of spherical iron powder, although the hydroxyl method and the atomization method have been practically applied, there are problems such as complex production process, large equipment investment, and high production cost.

Method used

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  • Preparation method of micron order spherical iron powder
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  • Preparation method of micron order spherical iron powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A preparation method of micron-sized spherical iron powder, specifically comprising the following steps:

[0048] Step 1, ultra-pure iron concentrate powder pretreatment

[0049] Sieve the ultra-pure iron concentrate powder to obtain ultra-pure iron concentrate powder with a particle size of 20-40 μm, and then put it into a drying oven for drying at a drying temperature of 130°C and a drying time of 3 hours until the ultra-pure iron concentrate powder The mass percentage of water in the ore powder is less than 1%, and the dried ultra-pure iron ore concentrate powder is obtained;

[0050] Step 2, Quick Restore

[0051] (1) use figure 1 The experimental device shown in the figure performs rapid reduction, and the reducing gas B containing methane and the dried ultra-pure iron concentrate powder A are passed into the conveying reactor 1, and the reducing gas B containing methane and the ultra-pure iron concentrate powder A are conveyed The furnace tube 1-1 of the reacto...

Embodiment 2

[0061] A preparation method of micron-sized spherical iron powder, specifically comprising the following steps:

[0062] Step 1, ultra-pure iron concentrate powder pretreatment

[0063] Sieve the ultra-pure iron concentrate powder to obtain ultra-pure iron concentrate powder with a particle size of 20-40 μm, and then put it into a drying oven for drying at a drying temperature of 130°C and a drying time of 3 hours until the ultra-pure iron concentrate powder The mass percentage of water in the ore powder is less than 1%, and the dried ultra-pure iron ore concentrate powder is obtained;

[0064] Step 2, Quick Restore

[0065] (1) use figure 1 The experimental device shown in the figure performs rapid reduction, and the reducing gas B containing methane and the dried ultra-pure iron concentrate powder A are passed into the conveying reactor 1, and the reducing gas B containing methane and the ultra-pure iron concentrate powder A are conveyed The furnace tube 1-1 of the reacto...

Embodiment 3

[0073] A preparation method of micron-sized spherical iron powder, specifically comprising the following steps:

[0074] Step 1, ultra-pure iron concentrate powder pretreatment

[0075] Sieve ultra-pure iron ore concentrate powder to obtain ultra-pure iron ore concentrate powder with a particle size of 65-71.4 μm, and then put it into a drying oven for drying at a drying temperature of 150°C and a drying time of 2 hours until the ultra-pure iron ore powder The mass percentage of water in the concentrate powder is less than 1%, and the dried ultra-pure iron concentrate powder is obtained;

[0076] Step 2, Quick Restore

[0077] (1) use Figure 4 The experimental device shown in the figure performs rapid reduction, and the reducing gas B containing methane and the dried ultra-pure iron concentrate powder A are passed into the conveying reactor 1, and the reducing gas B containing methane and the ultra-pure iron concentrate powder A are conveyed The furnace tube 1-1 of the rea...

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Abstract

The invention relates to a preparation method of micron order spherical iron powder and belongs to the technical field of powder metallurgy. The method includes the steps that after super-pure iron ore concentrate powder is screened and dried, the super-pure iron ore concentrate powder and reducing gas containing methane are introduced into a conveying reactor, the super-pure iron ore concentratepowder is subjected to fast reducing in a high-temperature area of the conveying reactor, the reducing temperature is 1200-1600 DEG C, the reducing time is 1-50 s, and after reducing, iron-carbon molten drops are obtained; the iron-carbon molten drops are fast cooled when passing through a cooling area of the conveying reactor, and are solidified to form spherical iron-carbon alloy powder; the spherical iron-carbon alloy powder is collected; and the spherical iron-carbon alloy powder is fed into a fluidizing bed, the secondary fine reducing process is performed, and the micro order spherical iron powder with the metallization rate large than or equal to 99% is obtained. According to the method, the reaction time is shortened, operation is easy and convenient, and the micro order sphericaliron powder high in sphericity degree, low in oxygen content, narrow in product particle size distribution and not prone to oxidization is effectively prepared.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of micron-sized spherical iron powder. Background technique [0002] Powder metallurgy is a technology that uses the mixture of metal powder and non-metal powder as raw material to obtain various materials and products through compression molding, sintering and subsequent treatment. It is a rapidly developing emerging technology. As the main raw material of iron-based powder metallurgy, iron powder is the most used type of powder in powder metallurgy. With the advancement of technology, iron powder has been developed and applied in metallurgy, chemical industry, electronics, magnetic material sensors, etc. At the same time, higher requirements are placed on the quality of the powder. As a high-performance metal powder, spherical iron powder is mainly used in advanced technologies such as metal additive manufacturing and injection moldin...

Claims

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Application Information

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IPC IPC(8): B22F9/22
CPCB22F9/22B22F1/065
Inventor 汪兴楠储满生付贵勤唐钰朱苗勇
Owner NORTHEASTERN UNIV