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Method for preparing tungsten trioxide by utilizing tungsten concentrate

A technology of tungsten trioxide and tungsten concentrate, which is applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems of separation and precipitation in an economical and effective way, produce acid and alkali waste liquid, pollute the environment, etc., and achieve increased surface area, clean production, The effect of increasing the contact area

Active Publication Date: 2012-08-22
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because sodium hydroxide and hydrochloric acid are used in these processes, the chemical properties of sodium ions and chloride ions are active, and it is impossible to separate the precipitates by economical and effective methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the muffle furnace, 1.2 times the theoretical amount (ie, 67.38g) of silicon dioxide was added to 500g of tungsten concentrate with a particle size of -320 mesh, the reaction temperature was 900 degrees Celsius, and the calcination time was 2 hours to obtain a fired product. The burnt product is manually crushed-after being wet-milled by a ball mill, the particle size is -320 mesh, and the wet-milled burnt product is mixed with 431.3ml of ammonia water for 1 hour in an autoclave at a temperature of 100 degrees Celsius and a pressure of 0.6MPa , The decomposition rate can reach 99.3%.

Embodiment 2

[0036] In a muffle furnace, 1.5 times the theoretical amount (ie, 84.22 g) of silicon dioxide was added to 500 g of tungsten concentrate with a particle size of -320 mesh, the reaction temperature was 900 degrees Celsius, and the calcination time was 2 hours to obtain a fired product. The burnt product is manually crushed-after being wet-milled by a ball mill, the particle size is -320 mesh, and the wet-milled burnt product is mixed with 431.3ml of ammonia water for 1 hour in an autoclave at a temperature of 100 degrees Celsius and a pressure of 0.6MPa , The decomposition rate can reach 99.6%.

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Abstract

The invention relates to a method for preparing tungsten trioxide by utilizing tungsten concentrate. The method comprises the steps of: mixing and calcining tungsten concentrate and silicon dioxide to obtain calcined product containing the tungsten trioxide. By utilizing the method, the tungsten trioxide can be prepared in one step by utilizing the tungsten concentrate, so that the process flow can be shortened, the waste acid and alkaline liquid caused by the utilization of sodium hydroxide and hydrochloric acid in the prior art can be effectively avoided, the environment is free from being polluted, and high-efficient and clean production and zero-emission of waste water and waste gas can be realized.

Description

technical field [0001] The invention belongs to the field of tungsten concentrate smelting. More specifically, the present invention relates to a method for preparing tungsten trioxide from tungsten concentrate. Background technique [0002] Traditionally, tungsten concentrate is mainly smelted by classical process, extraction process and ion exchange process. Because sodium hydroxide and hydrochloric acid are used in these processes, the chemical properties of sodium ions and chloride ions are active, and they cannot be separated and precipitated by economical and effective methods. Contents of the invention [0003] The present invention aims to solve at least one of the above-mentioned technical problems. [0004] In one aspect of the present invention, a method for preparing tungsten trioxide from tungsten concentrate is proposed. The method includes: mixing and calcining the tungsten concentrate and silicon dioxide, so as to obtain a fired product containing tungst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02C22B1/02
Inventor 赵立夫李红超徐国钻
Owner CHONGYI ZHANGYUAN TUNGSTEN
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