Method for extracting tungsten by acid decomposition of wolframite

A technology of wolframite and acid decomposition, which is applied in the field of chemical production, can solve the problems of polluting the environment, high prices, and increasing tungsten smelting costs, so as to reduce environmental protection costs, reduce decomposition costs, and increase product added value.

Active Publication Date: 2018-10-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

This mainstream technology is currently facing several serious problems: First, alkaline pressure cooking needs to consume alkali such as sodium hydroxide or sodium carbonate. The cost of wolframite decomposition is very high; second, alkali pressure cooking will produce alkali cooking slag, which has been listed in the national hazardous waste catalog, and tungsten smelting enterprises are not allowed to dispose of it at will, and must be handed over to qualified enterprises for paid treatment, and The state also charges an environmental protection tax of 2,000 yuan/ton for the hazardous waste alkali cooking slag, which greatly increas...

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  • Method for extracting tungsten by acid decomposition of wolframite

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Embodiment 1

[0036] This embodiment provides a method for acid-decomposing wolframite to extract tungsten. The raw material used in this method is wolframite with a grade of 40% and a particle size of 100 μm. The method is specifically as follows:

[0037] (1) Leaching reaction: adding wolframite to the sulfuric acid solution with a concentration of 200g / L, adding sodium hypochlorite equivalent to 1.5 times the total molar amount of iron and manganese in the wolframite, and the liquid-solid ratio of the system is 6:1. The leaching reaction was carried out at 90°C for 3 hours, and 99.2% of tungsten was converted into tungstic acid;

[0038] (2) Filtration and washing: filter the reaction product obtained in step (1) to obtain decomposition residue and leaching solution; add sulfuric acid to the leaching solution and return to step (1) as a raw material for leaching reaction;

[0039] (3) hydrogen peroxide extraction-decomposition and extraction of tungsten: wash the decomposed slag obtain...

Embodiment 2

[0042] This embodiment provides a method for acid-decomposing wolframite to extract tungsten. The raw material used in this method is wolframite with a grade of 10% and a particle size of 200 μm. The method is specifically:

[0043] (1) Leaching reaction: Add wolframite to a nitric acid solution with a concentration of 120g / L, the liquid-solid ratio of the system is 7:1, and carry out the leaching reaction under the conditions of 200°C and controlled oxygen pressure of 2.5Mpa by introducing oxygen 1 Hours, 99.4% of tungsten is converted into tungstic acid;

[0044] (2) Filtration and washing: filter the reaction product obtained in step (1) to obtain decomposition slag and leachate; add nitric acid in the leachate and return to step (1) as raw material for leaching reaction;

[0045] (3) hydrogen peroxide extraction-decomposition and extraction of tungsten: wash the decomposed slag obtained in step (2) and mix it with a hydrogen peroxide solution with a mass concentration of...

Embodiment 3

[0050] This embodiment provides a method for acid-decomposing wolframite to extract tungsten. The raw material used in this method is wolframite with a grade of 65% and a particle size of 50 μm. The method is specifically as follows:

[0051] (1) Leaching reaction: Add wolframite to a sulfuric acid solution with a concentration of 200g / L, and then add solid tungstic acid accounting for 10% of the wolframite mass. The liquid-solid ratio of the system is 3:1. 、The leaching reaction was carried out under the condition of 1.25Mpa for 6 hours, and 99.3% of tungsten was converted into tungstic acid;

[0052] (2) Filtration and washing: filter the reaction product obtained in step (1) to obtain decomposition residue and leaching solution; add sulfuric acid to the leaching solution and return to step (1) as a raw material for leaching reaction;

[0053] (3) hydrogen peroxide extraction-decomposition and extraction of tungsten: wash the decomposed slag obtained in step (2) and mix it...

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Abstract

The invention relates to a method for extracting tungsten by acid decomposition of wolframite. The method comprises the following steps: (1) a leaching reaction; (2) filtering and washing; (3) hydrogen peroxide extraction-tungsten decomposition extraction; (4) multi-time hydrogen peroxide dissolving-decomposition for purifying tungstic acid; (5) preparation of tungsten trioxide by calcination of pure tungstic acid; and (6) preparation of tungsten oxide and tungsten powder by spray pyrolysis of a peroxotungstic acid solution. A small amount of nitric acid or hydrochloric acid and a large amountof cheap and easily available sulfuric acid are actually consumed in the decomposition process of the method, so the decomposition cost of tungsten ores is greatly reduced; hydrogen peroxide is usedas an extractant for tungstic acid, so ammonia nitrogen wastewater is not generated, an ammonia nitrogen wastewater generating technology used in tungsten smelting for many years is abolished, and the environmental protection cost is greatly reduced; and the method allows various tungsten end products (tungsten oxide and tungsten powder) of tungsten to be directly produced, so the added values oftungsten smelting enterprises are increased.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a method for acid-decomposing wolframite to extract tungsten. Background technique [0002] At present, the mainstream technology for processing wolframite in industry is to first use sodium hydroxide to pressure cook to obtain crude sodium tungstate solution and alkali cooking residue. Crude sodium tungstate solution is converted into ammonium tungstate solution by ion exchange technology after being diluted with a large amount of water, and is also transformed into ammonium tungstate solution by solvent extraction. This mainstream technology is currently facing several serious problems: First, alkaline pressure cooking needs to consume alkali such as sodium hydroxide or sodium carbonate. The cost of wolframite decomposition is very high; second, alkali pressure cooking will produce alkali cooking slag, which has been listed in the national hazardous waste catalog, and tungst...

Claims

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Application Information

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IPC IPC(8): C22B34/36C22B3/06C22B3/08C22B3/10C22B3/44B22F9/30C01G41/02
CPCC22B3/065C22B3/08C22B3/10C22B3/44C22B34/36C01G41/003C01G41/02B22F9/30C01P2004/32B22F1/065Y02P10/20
Inventor 陈星宇赵中伟
Owner CENT SOUTH UNIV
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