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Preparation method of high-purity micron-scale spherical molybdenum powder

A micron-scale, molybdenum powder technology, applied in the field of powder metallurgy, can solve the problems of poor controllability and low purity of molybdenum powder, and achieve the effects of reducing surface tension, improving microscopic appearance, and improving particle size controllability

Active Publication Date: 2019-07-16
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The molybdenum powder prepared by this invention is not high in purity, the particle size is nanoscale, and the controllability of particle size distribution and average particle size is poor.

Method used

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  • Preparation method of high-purity micron-scale spherical molybdenum powder
  • Preparation method of high-purity micron-scale spherical molybdenum powder
  • Preparation method of high-purity micron-scale spherical molybdenum powder

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Embodiment 1

[0029] The preparation method of the present embodiment comprises:

[0030] Step 1, ammonium paramolybdate is purified to obtain purified ammonium paramolybdate solution; the specific process of the purification is: 10g ammonium paramolybdate is dissolved in 500mL ultrapure water to obtain ammonium paramolybdate solution, and the ammonium paramolybdate solution is obtained under stirring conditions Add analytically pure ammonia water dropwise to the ammonium paramolybdate solution to adjust the pH of the ammonium paramolybdate solution to 6.5, then seal it and place it at room temperature for static aging, and the ammonium paramolybdate solution after static aging Filter to obtain the filtrate, then pass the filtrate through the pre-washed and purified D380 resin column, and desorb with analytically pure ammonia water to obtain a purified ammonium paramolybdate solution;

[0031]Step 2, adjust the concentration of the purified ammonium paramolybdate solution obtained in step 1...

Embodiment 2

[0036] The preparation method of the present embodiment comprises:

[0037] Step 1, ammonium paramolybdate is purified to obtain purified ammonium paramolybdate solution; the specific process of the purification is: 10g ammonium paramolybdate is dissolved in 500mL ultrapure water to obtain ammonium paramolybdate solution, and the ammonium paramolybdate solution is obtained under stirring conditions Add analytically pure ammonia water dropwise to the ammonium paramolybdate solution to adjust the pH of the ammonium paramolybdate solution to 6.5, then seal it and place it at room temperature for static aging, and the ammonium paramolybdate solution after static aging Filter to obtain the filtrate, then pass the filtrate through the pre-washed and purified D380 resin column, and desorb with analytically pure ammonia water to obtain a purified ammonium paramolybdate solution;

[0038] Step 2, adjust the concentration of the purified ammonium paramolybdate solution obtained in step ...

Embodiment 3

[0042] The preparation method of the present embodiment comprises:

[0043] Step 1, ammonium paramolybdate is purified to obtain purified ammonium paramolybdate solution; the specific process of the purification is: 10g ammonium paramolybdate is dissolved in 500mL ultrapure water to obtain ammonium paramolybdate solution, and the ammonium paramolybdate solution is obtained under stirring conditions Add analytically pure ammonia water dropwise to the ammonium paramolybdate solution to adjust the pH of the ammonium paramolybdate solution to 6.5, then seal it and place it at room temperature for static aging, and the ammonium paramolybdate solution after static aging Filter to obtain the filtrate, then pass the filtrate through the pre-washed and purified D380 resin column, and desorb with analytically pure ammonia water to obtain a purified ammonium paramolybdate solution;

[0044] Step 2, adjust the concentration of the purified ammonium paramolybdate solution obtained in step ...

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Abstract

The invention discloses a preparation method of high-purity micron-scale spherical molybdenum powder. The preparation method comprises the following steps of S1, sequentially dropwise adding ammoniumhydroxide into ammonium paramolybdate and ageing, carrying out purification by a resin column adsorption to obtain a purified ammonium paramolybdate solution; S2, adjusting the pH of the purified ammonium paramolybdate solution to be neutral, adding citric acid to adjust the pH value to be 1.0; S3, carrying out airflow-type atomization on the purified ammonium paratungstate solution with the pH value of 1.0 to obtain ammonium paramolybdate powder; and S4, placing the ammonium paramolybdate powder in a tubular rotary furnace to be reduced to obtain the molybdenum powder. According to the method, ammonium paramolybdate is prepared into a solution to purify, the quality purity of the molybdenum powder is improved from the source, then the surfactant citric acid is added, the surface tension of the purified ammonium paramolybdate solution is reduced, more uniform drops with higher spherical degree, smaller particle size of the ammonium paramolybdate solution is generated in the airflow type atomization process, so that the spherical degree of the molybdenum powder is improved, molybdenum powder which is high in purity, micron-sized and uniform in particle size distribution is obtained;and meanwhile, the granularity controllability of the molybdenum powder is improved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of high-purity micron-sized spherical molybdenum powder. Background technique [0002] With the rapid development of modern technology, especially high-end technologies such as electronic information and aerospace, the demand for high-performance, high-purity, and high-density molybdenum-based products has increased dramatically. At present, powder net near-shaping is a new technology for preparing difficult-to-machine and high-quality blocks. Its main process is powder forming and sintering, and powder forming is the core of this technology. Conventional hydrogen-reduced molybdenum powder has uneven particle size distribution, poor particle sphericity, and poor fluidity, which cannot meet the needs of high-quality molybdenum powder in emerging fields. solved problem. [0003] At present, the methods for preparing spherical molybdenum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 操齐高赵盘巢郑晶王珊党蕊陈昆昆孟晗琪张卜升
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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