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Method for manufacturing molybdenum powder

The technology of molybdenum powder and molybdenum trioxide is applied in the field of preparation of molybdenum powder, which can solve the problems of high cost and environmental pollution, and achieve the effects of increasing production capacity, reducing production cost and no sintering.

Active Publication Date: 2013-07-17
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to use water-washed ammonium molybdate as raw material to provide a method for preparing molybdenum powder, which solves the problems of environmental pollution and high cost caused by the existing preparation method using pickled ammonium molybdate as raw material

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  • Method for manufacturing molybdenum powder

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[0024] The preparation method of the molybdenum powder of the present invention comprises firstly decomposing the water-washed ammonium dimolybdate to obtain gray and white molybdenum trioxide, and then mixing the molybdenum trioxide uniformly through inverse hydrogen reduction to obtain the molybdenum powder.

[0025] Specific steps are as follows:

[0026] In step 1, the Fischer particle size is 40-50 μm, and the bulk density is 1.4-1.5 g / cm 3 , the water-washed ammonium dimolybdate with a K content of 60-80ppm is thermally decomposed in a roasting furnace, and the highest roasting temperature is 500-520°C to obtain gray and white molybdenum trioxide;

[0027] In step 2, the molybdenum trioxide obtained in step 1 is subjected to inverse hydrogen reduction in four temperature zones of a flat four-tube reduction furnace, and the molybdenum trioxide obtained in step 1 is loaded into a feeding boat with a thickness of 16-18mm and a reduction temperature of 300- 540°C is set to ...

Embodiment 1

[0034] Step 1, the Fischer particle size is 45 μm, and the bulk density is 1.42g / cm 3 , the water-washed ammonium dimolybdate with a K content of 60ppm is thermally decomposed in a roasting furnace with a maximum roasting temperature of 510°C to obtain gray and white molybdenum trioxide;

[0035] Step 2, the molybdenum trioxide obtained in step 1 is subjected to inverse hydrogen reduction in four temperature zones of the flat four-tube reduction furnace, and the molybdenum trioxide obtained in step 1 is loaded into a feeding boat with a thickness of 16mm, and the reduction temperature is 300°C, 380°C °C, 480 °C and 520 °C step by step setting, the hydrogen flow rate is 6m 3 / h tube, after heating for 3.5h, cool naturally, and then sieve with an 80-mesh screen to obtain molybdenum dioxide powder;

[0036] Step 3: The molybdenum dioxide obtained in step 2 is subjected to inverse hydrogen reduction in 5 temperature zones of a flat four-tube reduction furnace, and the molybdenum ...

Embodiment 2

[0038] Step 1, the Fischer particle size is 40 μm, and the bulk density is 1.4g / cm 3 , the water-washed ammonium dimolybdate with a K content of 75ppm is thermally decomposed in a roasting furnace at a maximum roasting temperature of 500°C to obtain gray and white molybdenum trioxide;

[0039] Step 2, the molybdenum trioxide obtained in step 1 is subjected to inverse hydrogen reduction in four temperature zones of a flat four-tube reduction furnace, and the molybdenum trioxide obtained in step 1 is loaded into a boat with a thickness of 17mm, and the reduction temperature is 310°C, 390°C °C, 490 °C and 530 °C step by step setting, the hydrogen flow rate is 4m 3 / h tube, after heating for 4h, cool naturally, and then sieve with 80 mesh screen to obtain molybdenum dioxide powder;

[0040] Step 3, the molybdenum dioxide obtained in step 2 is subjected to inverse hydrogen reduction in 5 temperature zones of the flat four-tube reduction furnace, and the molybdenum dioxide powder o...

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Abstract

The invention discloses a method for manufacturing molybdenum powder. The method includes performing thermal decomposition for washing ammonium dimolybdate to obtain gray and white molybdenum trioxide; and performing para-hydrogen reduction for the molybdenum trioxide to obtain semi-finished products and uniformly mixing the semi-finished products to obtain the molybdenum powder. The method for manufacturing the molybdenum powder has the advantages that the washing ammonium dimolybdate is used as a raw material, accordingly, environmental pollution is prevented, the gray and white molybdenum trioxide is obtained by means of low-temperature calcination, energy consumption is reduced, and the productivity is improved; the molybdenum trioxide is reduced to form molybdenum dioxide, and the molybdenum dioxide is heated in four temperature zones of a horizontal four-tube reduction furnace and then is naturally cooled, so that energy consumption is reduced, the production cost is lowered, and the molybdenum dioxide can be assuredly dispersed; the method for manufacturing the molybdenum powder is simple, safe and reliable in operation and suitable for batch production; and the manufactured molybdenum powder is dispersed uniformly without being calcined, the Fisher particle size of the manufactured molybdenum powder ranges from 3.2 micrometers to 4.5 micrometers, the apparent density of the manufactured molybdenum powder ranges from 1.0g / cm<3> to 1.3g / cm<3>, and the yield reaches 90% at least after the manufactured molybdenum powder is screened by 200-mesh screen cloth.

Description

technical field [0001] The invention belongs to the technical field of material preparation and relates to a method for preparing molybdenum powder. Background technique [0002] With the development of the molybdenum industry, sputtering targets, glass products, electric light sources, metallurgy and metal processing industries have higher and higher requirements for molybdenum products. Molybdenum powder is the raw material for the production of various molybdenum products, and the preparation of molybdenum powder is particularly important. Important, at the same time, under the premise of ensuring and improving the quality of molybdenum powder, it is also very important to reduce production costs. [0003] The existing molybdenum powder preparation process is based on pickling ammonium molybdate as raw material, which is roasted into light yellow or light green high-purity molybdenum trioxide, reduced to molybdenum dioxide in a domestic 5-temperature zone flat four-tube r...

Claims

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Application Information

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IPC IPC(8): B22F9/22
Inventor 吴兴刚肖江涛付小俊曹维成任宝江王岗仙彬华
Owner JINDUICHENG MOLYBDENUM CO LTD
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