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A method of eliminating potassium impurity from molybdenum powders

A technology of molybdenum powder and impurities, which is applied in the field of metal molybdenum preparation, can solve the problems of high residual potassium ratio and inability to effectively remove potassium impurities in molybdenum powder, and achieve the effects of improving purity, improving reduction efficiency, and good performance

Inactive Publication Date: 2009-03-04
JIANGSU DONGTAI FENGFENG TUNGSTEN & MOLYBDENUM MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality of molybdenum powder produced by the above-mentioned traditional process depends to a large extent on the raw material quality of ammonium molybdate, and potassium is the impurity element with the highest content in ammonium molybdate products. The existing molybdenum powder production process cannot be effective Remove potassium impurities in molybdenum powder, which has a high proportion of potassium residues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 1000Kg of ammonium molybdate with a potassium content of 0.04% and use a multi-tube reduction furnace for low-temperature hydrogen reduction. The reaction temperature zone is 400-650°C, the ammonium molybdate push speed is 3 boats / 0.5 hours, and the hydrogen flow rate of each tube is 2.5 cubic meters per hour. The molybdenum dioxide generated after reduction is sieved and passed through a sieve with a pore size of 175um. Then use a four-tube reduction furnace to carry out hydrogen reduction of molybdenum dioxide to produce molybdenum powder. The reaction temperature range is 800-980°C, the molybdenum dioxide push speed is 1 boat / 0.5 hour, and the hydrogen flow rate of each tube is 10.0 cubic meters per hour. Molybdenum powder analysis potassium content still reaches 0.038%.

[0013] Then take 500 kg of the above-mentioned molybdenum powder reduced by secondary hydrogen, add it into a jacketed reaction pot with 1500 kg of pure water, heat it to 90 ° C under stirring...

Embodiment 2

[0017] In this embodiment, the process for preparing the molybdenum powder is the same as the above embodiment. After the molybdenum powder is prepared by the secondary hydrogen reduction, take 500kg of the molybdenum powder reduced by the secondary hydrogen, add it to a jacketed reaction pot with 1500Kg of pure water and 100Kg of hydrochloric acid, and heat it to 90°C under agitation. Keep it for 3 hours, release it for suction filtration, wash with pure water four times, and the pH of the washing solution is ≤4. Put it into an oven and dry at 80°C for 10 hours, sieve, and pass through a sieve with a pore size of 350um.

[0018] Use a four-tube hydrogen reduction furnace for three high-temperature reductions, the reaction temperature range is 800-1000°C, the molybdenum powder push speed is 2 boats / 0.5 hours, and the hydrogen flow rate of each tube is 8 cubic meters / hour. The molybdenum powder is sieved through a sieve with a pore size of 60um. The mixing equipment is a V-sh...

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Abstract

The method of eliminating potassium impurity from molybdenum powder includes the following steps: the first hydrogen reduction of ammonium molybdate to produce molybdenum dioxide, sieving and the secondary hydrogen reduction to produce molybdenum powder; water washing or acid pickling molybdenum powder, solid-liquid separation, stoving and sieving to obtain the molybdenum powder product. One third hydrogen reduction step may be also added after stoving. The technological process is simple and has obvious effect of eliminate potassium impurity.

Description

technical field [0001] The invention relates to a method for preparing metallic molybdenum, in particular to a process for removing potassium impurities in molybdenum powder. Background technique [0002] Because of its excellent physical and chemical properties such as high melting point, high wear resistance, good thermal conductivity and low expansion coefficient, molybdenum metal is widely used in industrial production such as electronics, electric light source, metallurgy and metal processing industries. And molybdenum powder is the material for making various molybdenum products. Under most conditions of use, molybdenum and molybdenum powder are required to have higher purity in application. [0003] The traditional molybdenum powder preparation process uses ammonium molybdate as the raw material, undergoes a low-temperature hydrogen reduction to generate molybdenum dioxide, and performs a second high-temperature hydrogen reduction after sieving, and then sieves, mixes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/26
Inventor 吴勇本徐志贤
Owner JIANGSU DONGTAI FENGFENG TUNGSTEN & MOLYBDENUM MATERIAL
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