Method for preparing molybednum powder

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

Inactive Publication Date: 2004-03-10
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] Embodiment 1: get 1000kg ammonium polymolybdate, by ammonium polymolybdate: pure water: ammoniacal liquor=1: 0.25: 0.6, add pure water 250l and ammoniacal liquor 600l in stainless steel dissolving crystallization tank. Heat to 60°C to dissolve ammonium polymolybdate with a density of 1.58g / cm 3 , when adding KOH 60g and stirring continuously, the vapor pressure is kept at 0.1-0.15Mpa to keep the solution in the tank boiling, the concentration time is 50 minutes, and the specific gravity of the crystallization mother liquor is measured as 1.26g / cm 3 Timely discharge, drain and separate. After calcining, hydrogen reduction and sieving, 511.3 kg of molybdenum powder was obtained, with a yield of 96.5%.

Embodiment 2

[0009] Embodiment 2: get 1000kg ammonium polymolybdate, by ammonium polymolybdate: pure water: ammoniacal liquor=1: 0.23: 0.6, add pure water 230l and ammoniacal liquor 600l in stainless steel dissolving crystallization tank. Heat to 60°C to dissolve ammonium polymolybdate with a density of 1.6g / cm 3 , the vapor pressure is kept at 0.1-0.15Mpa under constant stirring to keep the solution in the tank boiling, add 230g of KOH, the concentration time is 48 minutes, and the specific gravity of the crystallization mother liquor is measured as 1.25g / cm 3 Timely discharging, drying, separation, and then calcination, hydrogen reduction and sieving to obtain 515.8kg of molybdenum powder, the actual yield was 96.69%.

Embodiment 3

[0010] Embodiment 3: get 1000kg ammonium polymolybdate, press ammonium polymolybdate: pure water: ammoniacal liquor=1: 0.22: 0.6, add pure water 220l toward the stainless steel dissolving crystal tank, add ammoniacal liquor 600l, be heated to 60 ℃, put polymolybdate Ammonium molybdate is dissolved, the density is 1.62g / cm 3 . In the case of constant stirring, the steam pressure is kept 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 3 516.7 kg of molybdenum powder was obtained by discharging, draining, separating, calcining, reducing with hydrogen and sieving, with a yield of 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 molybdenum bar, molybdenum electrode, molybdenum plug, molybdenum slab, molybdenum wire, molybdenum foil and other molybdenum alloy products, which are 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 dissolving ammonium polymolybdate in ammonia water, followed by crystallization, calcination, hydrogen reduction and sieving. [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. Invention content: [0005] The purpose of this invention is to provide a kind of preparat...

Claims

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Application Information

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Patent Type & Authority Applications(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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