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Method for preparing molybednum powder

A technology of ammonium polymolybdate and ammonia water, which is applied in the field of molybdenum powder preparation, can solve the problems of reducing the actual yield of molybdenum powder and increasing the cost of molybdenum products

Inactive Publication Date: 2005-06-01
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using this method to prepare molybdenum powder, there are a lot of sieves during sieving, sometimes as high as 30-35%, which reduces the actual yield of molybdenum powder and increases the cost of molybdenum products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: Take 1000 kg of ammonium polymolybdate, add 250 liters of pure water and 600 liters of ammonia water to the stainless steel dissolving crystallization tank according to ammonium polymolybdate: pure water: ammonia water=1:0.25:0.6. Heat to 60℃, dissolve ammonium polymolybdate, the density is 1.58g / cm 3 , Keep the vapor pressure at 0.1~0.15Mpa under the condition of adding KOH 60g and constant stirring to keep the solution boiling in the tank, the concentration time is 50 minutes, and the specific gravity of the crystallization mother liquor is 1.26g / cm. 3 Discharge, drain, and separate from time to time. After calcination, hydrogen reduction and sieving, 511.3 kg of molybdenum powder was obtained, and the actual yield was 96.5%.

Embodiment 2

[0009] Example 2: Take 1000 kg of ammonium polymolybdate, add 230 liters of pure water and 600 liters of ammonia water to the stainless steel dissolution crystallization tank according to ammonium polymolybdate: pure water: ammonia water = 1: 0.23: 0.6. Heat to 60℃, dissolve ammonium polymolybdate, with a density of 1.6g / cm 3 , Keep the vapor pressure at 0.1~0.15Mpa under constant stirring to keep the solution boiling in the tank, add 230g of KOH, the concentration time is 48 minutes, and the specific gravity of the crystallization mother liquor is 1.25g / cm. 3 Discharging, draining, separating, calcination, hydrogen reduction and sieving to obtain 515.8 kg of molybdenum powder, the actual yield is 96.69%.

Embodiment 3

[0010] Example 3: Take 1000kg of ammonium polymolybdate, according to ammonium polymolybdate: pure water: ammonia water=1:0.22:0.6, add 220l of pure water to the stainless steel dissolving crystallization tank, add 600l of ammonia water, and heat to 60°C. Ammonium molybdate is dissolved with a density of 1.62g / cm 3 . Under the condition of constant stirring, the steam pressure is maintained at 0.1~0.15Mpa to keep the solution in the tank boiling. Add 250g of KOH, the concentration time is 47 minutes, and the measured crystallization mother liquor is 1.24g / cm 3 Discharging, draining, separating, calcination, hydrogen reduction and sieving to obtain 516.7 kg of molybdenum powder, the actual yield is 96.43%.

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PUM

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Abstract

A process for preparing molybdenum powder includes dissolving ammonium polymolybdate in NH3.H2O, crystallizing while adding KOH, calcining, hydrogen reduction and sieving. Its advantage is high output rate up to 95%.

Description

Technical field: [0001] The invention relates to a method for preparing molybdenum powder. Background technique: [0002] Molybdenum powder can be processed into aluminum bars, molybdenum electrodes and molybdenum alloy products such as molybdenum tip, molybdenum slab, molybdenum wire, molybdenum foil, etc. It is widely used in steel, metal pressure processing, electric light source, electric vacuum, metallurgy, aerospace and military industries, etc. field. [0003] The current industrial method for preparing molybdenum powder includes the steps of dissolving ammonium polymolybdate in ammonia water, crystallization, calcining, hydrogen reduction, and sieving. [0004] When the molybdenum powder is prepared by this method, there are a lot of materials on the sieve, sometimes as high as 30-35%, which reduces the actual yield of molybdenum powder and increases the cost of molybdenum products. Summary of the invention: [0005] The purpose of the present invention is to provide a m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F9/26C22B34/34
Inventor 申友元吴国根陈和平黄广华李玉清李正林
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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