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A method for preparing ultra-fine iron powder by low-temperature hydrocarbon double reduction

An ultra-fine iron powder and hydrocarbon technology, applied in the field of powder metallurgy preparation, can solve the problems of low hydrogen conversion rate and high hydrogen consumption, and achieve the effects of low reaction temperature, low production cost and reduced preparation cost

Active Publication Date: 2021-08-03
钢研晟华科技股份有限公司
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  • Abstract
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Problems solved by technology

This method can obtain ultra-fine iron powder, but due to the low conversion rate of hydrogen at low temperature, the amount of hydrogen used is high

Method used

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  • A method for preparing ultra-fine iron powder by low-temperature hydrocarbon double reduction
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  • A method for preparing ultra-fine iron powder by low-temperature hydrocarbon double reduction

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preparation example Construction

[0058] The preparation method of ultra-fine iron powder proposed in the present invention combines the advantages of gas-based reduction method, carbothermal reduction and ball milling method. Iron oxide is a brittle substance, while iron powder is a plastic substance, so iron oxide is easier to break to the micron level . It can be seen from the kinetics that the finer the particle size, the faster the reaction speed or the lower the required reaction temperature. Therefore, the carbothermal reduction temperature of the ultrafine iron ore concentrate powder of the present invention is only 800-850 ° C. At this temperature, the reaction iron Grains are not easy to grow. If the reaction temperature is too high, the iron powder is easily sintered into hard lumps, and ultrafine iron powder cannot be obtained. The reduction time of 2 to 3 hours is more suitable. When the thickness of the material is thin, the reduction time should be shorter, and vice versa. If the reduction tim...

Embodiment 1

[0082] Iron concentrate powder, carbon powder and catalyst K 2 CO 3 The mass ratio of ingredients is 100:16.5:0.6; the temperature for carbon reduction is 820°C, the heating time is 1.5h, and the thickness of the material is 20mm; the temperature for hydrogen reduction is 790°C, the heating time is 2.0h, and the thickness of the material is 20mm ; In the final superfine iron powder product, the total iron content is 98.5%, the C content is 0.02%, the residual oxygen content is 0.25%, and the acid insoluble content is 0.1%.

Embodiment 2

[0084] Iron concentrate powder, carbon powder and catalyst Na 2 CO 3 The mass ratio of ingredients is 100:18.2:1.2; the temperature for carbon reduction is 840°C, the heating time is 2.5h, and the thickness of the material is 25mm; the temperature for hydrogen reduction is 760°C, the heating time is 2.5h, and the thickness of the material is 25mm ; In the final superfine iron powder product, the total iron content is 98.3%, the C content is 0.03%, the residual oxygen content is 0.26%, and the acid insoluble content is 0.09%.

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Abstract

A method for preparing ultra-fine iron powder through double reduction of low-temperature hydrocarbons, step 1, ball milling iron ore concentrate powder, carbon powder and catalyst with a certain purity; The ratio is evenly mixed; step 3, the material after mixing is placed under a protective atmosphere for heating and reduction, and primary reduced iron is obtained after cooling; step 4, the primary reduced iron described in step 3 is ball milled; step 5, the primary reduced iron in step 4 is The primary reduced iron after ball milling is placed in a hydrogen atmosphere for final reduction, cooled and released from the furnace to obtain reduced iron powder; step 6, ball milling the reduced iron powder described in step 5 to obtain superfine iron powder. Compared with the prior art, the present invention has the advantages of low reaction temperature, low energy consumption, and low hydrogen consumption, and is easy to obtain high-quality ultrafine iron powder, and has simple preparation process, low energy consumption, and low production cost.

Description

technical field [0001] The invention relates to the field of powder metallurgy preparation, in particular to a low-temperature carbon-hydrogen double reduction preparation method for preparing micron-level and submicron-level ultrafine iron powder. Background technique [0002] In the prior art, micron-sized iron powder is one of the basic raw materials in the powder metallurgy industry, with a particle size of 1-10 microns. Micron-sized iron powder has a large specific surface area and activity, and is mainly used in the fields of powder metallurgy, manufacturing mechanical parts, producing friction materials, anti-friction materials, superhard materials, magnetic materials, lubricants and their products. In recent years, it also has broad application prospects in many fields such as electromagnetics, biology, medicine, and optics. In particular, the development of 3D printing technology will promote the further expansion of the market for ultrafine iron powder. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F9/04
CPCB22F9/04B22F9/22B22F2009/043
Inventor 郭培民赵沛孔令兵王磊刘云龙
Owner 钢研晟华科技股份有限公司
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