Application of EDTA (ethylene diamine tetraacetic acid) in W-Co composite oxide powder

A composite oxide, tungsten-cobalt technology, applied in the field of metal materials, can solve problems such as unsuitable for hard alloys, achieve high production efficiency, short production cycle, and save production consumption

Active Publication Date: 2013-07-10
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it belongs to the category of mixed metal oxide powder produced in liquid phase. EDTA plays a role in making the matrix metal and dispersed phase oxide uniformly dispersed, and it also needs to add nitrate and ammonia water, which is not suitable for cemented carbide production. Apply on

Method used

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  • Application of EDTA (ethylene diamine tetraacetic acid) in W-Co composite oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Take 750L of metatungstic acid solution, its [H + ]=0.281mol / L, [NH 4 + ]=0mol / L;

[0019] (2) Take by weighing cobalt carbonate powder 15.366kg, EDTA powder 2.409kg for subsequent use;

[0020] (3) Heat the metatungstic acid solution to 80°C, add 13.381kg of cobalt carbonate to make it fully react, and obtain the first tungsten-cobalt composite solution;

[0021] (4) Continue to heat up to 100°C, mix the remaining cobalt carbonate powder and EDTA powder evenly, and then gradually add to the above-mentioned first tungsten-cobalt composite solution to make it react completely to obtain the second tungsten-cobalt composite solution;

[0022] (5) Concentrating the obtained second tungsten-cobalt composite solution, spray drying, drying and calcining to obtain tungsten-cobalt composite oxide powder, the mass percentage of cobalt is 6.72%;

[0023] (6) Carry out reductive carbonization of the above-mentioned tungsten-cobalt composite oxide to obtain tungsten carbide-co...

Embodiment 2

[0025] (1) (obtained by using ammonium metatungstate exchange) take 500L of metatungstate, its [H + ]=0.420mol / L, [NH 4 + ]=0.005mol / L;

[0026] (2) Take by weighing cobalt carbonate powder 19.637kg, EDTA powder 7.592kg for subsequent use;

[0027] (3) Heat the metatungstic acid solution to 70°C, add 13.478kg of cobalt carbonate to make it fully react, and obtain the first tungsten-cobalt composite solution;

[0028] (4) Continue to heat up to 90°C, mix the remaining cobalt carbonate powder and EDTA powder evenly, and then gradually add to the above-mentioned first tungsten-cobalt composite solution to make it react completely to obtain the second tungsten-cobalt composite solution;

[0029] (5) The obtained second tungsten-cobalt composite solution is concentrated, spray-dried, dried and calcined to obtain tungsten-cobalt composite oxide powder, and the mass percentage of cobalt is 8.39%;

[0030] (6) Carry out reductive carbonization of the above-mentioned tungsten-cobal...

Embodiment 3

[0032] (1) (obtained by using ammonium metatungstate exchange) take 750L of metatungstate solution, its [H + ]=0.461mol / L, [NH 4 + ]=0.01mol / L;

[0033] (2) Take by weighing cobalt carbonate powder 48.206kg, EDTA powder 26.024kg for subsequent use;

[0034] (3) Heat the metatungstic acid solution to 60°C, add 26.892kg of cobalt carbonate to make it fully react, and obtain the first tungsten-cobalt composite solution;

[0035] (4) Continue to heat up to 80°C, mix the remaining cobalt carbonate powder and EDTA powder evenly, and then gradually add to the above-mentioned first tungsten-cobalt composite solution to make it react completely to obtain the first tungsten-cobalt composite solution;

[0036] (5) Concentrating the obtained second tungsten-cobalt composite solution, spray drying, drying and calcining to obtain tungsten-cobalt composite oxide powder, the mass percentage of cobalt is 10.05%;

[0037] (6) Carry out reductive carbonization of the above-mentioned tungsten...

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Abstract

The invention discloses application of EDTA (ethylene diamine tetraacetic acid) in W-Co composite oxide powder, which comprises the steps of fully reacting metatungstic acid solution with certain concentration with cobalt carbonate to obtain first W-Co composite solution with uniform components; mixing EDTA powder and cobalt carbonate powder uniformly, and adding the mixed powder to the first W-Co composite solution for reaction to obtain second W-Co composite solution conforming the W-Co proportioning requirements of the process; and drying and pelletizing the second W-Co composite solution,spray drying, and removing water so as to obtain the W-Co composite oxide powder which has uniform components, contains Co content being more than 7 percent, can randomly adjust the Co content and isaccurate in control, so that the process is simplified, the production efficiency is improved and the production consumption is reduced.

Description

technical field [0001] The invention belongs to the field of metal materials and belongs to the category of cemented carbide powder preparation, and is particularly suitable for the preparation of tungsten-cobalt composite oxide powder with high cobalt content and subsequent preparation of tungsten carbide-cobalt composite powder. Background technique [0002] Cemented carbide is mainly made of rare metals such as tungsten, cobalt, and titanium, among which tungsten carbide-cobalt cemented carbide occupies the main position. Cemented carbide has special properties such as high hardness, high density, and wear resistance. It is widely used in many fields such as machinery manufacturing, oil exploration, military industry, and aerospace. It is a new type of force-bearing structural material with high-tech content. market potential. Traditional cemented carbide preparation methods mainly use fixed bed, rotary furnace, hydrogen plasma and other methods to reduce tungsten oxide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F9/06
Inventor 龚南燕文劼张璐
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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