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Method of eliminating potassium impurity from molybdenum powder

A technology of molybdenum powder and impurities, which is applied in the field of metal molybdenum preparation, can solve the problems of ineffective removal of molybdenum powder potassium impurities and high residual ratio of potassium, and achieve the effects of improving reduction efficiency, improving purity and excellent quality

Inactive Publication Date: 2007-08-22
JIANGSU DONGTAI FENGFENG TUNGSTEN & MOLYBDENUM MATERIAL
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  • Summary
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  • 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 is 400-650°C, the ammonium molybdate pushes the speed 3 boats / 0.5 hour, and the hydrogen flow rate per tube is 2.5 cubic meters / hour. The molybdenum dioxide generated after reduction is sieved and passed through a sieve with 175um aperture. Subsequently, a four-tube reduction furnace is used for hydrogen reduction of molybdenum dioxide to produce molybdenum powder. The reaction temperature is 800-980°C, the molybdenum dioxide is pushed by 1 boat / 0.5 hour, and the hydrogen flow rate per tube is 10.0 cubic meters / hour. The potassium content of molybdenum powder is still up to 0.038%.

[0013] Then take 500kg of the molybdenum powder after the second hydrogen reduction and add it to a jacketed reaction pot containing 1500Kg of pure water. Under stirring, heat to 90℃, keep it for 3 hours, discharge and filter...

Embodiment 2

[0017] In this embodiment, the process method for preparing molybdenum powder is the same as the above embodiment. After the molybdenum powder is prepared by the second hydrogen reduction, take 500kg of the molybdenum powder after the second hydrogen reduction, add it to a jacketed reaction pot containing 1500Kg of pure water and 100Kg of hydrochloric acid, and heat it to 90°C under stirring conditions. Keep it for 3 hours, discharge and filter, wash with pure water four times, and the pH of the washing liquid is ≤4. Put it in an oven and dry at 80°C for 10 hours, sieving, and pass through a 350um sieve.

[0018] Four-tube hydrogen reduction furnace is used for three high-temperature reductions, the reaction temperature is 800-1000℃, the molybdenum powder pushes the speed 2 boats / 0.5 hour, and the hydrogen flow rate per tube is 8 cubic meters / hour. The molybdenum powder is sieved through a 60um sieve. The mixing equipment is a V-type mixer, and the mixing time is 2 hours. The moly...

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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 preparation method of metallic molybdenum, in particular to a process method 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 coefficient of expansion, 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 used to make various molybdenum products. Under most conditions of use, molybdenum and molybdenum powder are required to have high purity in application. [0003] The traditional molybdenum powder preparation process uses ammonium molybdate as the raw material and undergoes primary low-temperature hydrogen reduction to generate molybdenum dioxide. After screening, the secondary high-temperature hydrogen reduction is performed,...

Claims

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Application Information

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Patent Type & Authority Applications(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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