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Method for extracting tungsten from wolframite or scheelite and wolframite mixed ores

A technology of black and white tungsten and mixed ore, which is applied in the extraction of metal tungsten, and efficiently extracts tungsten from wolframite or black and white tungsten mixed ore. It can solve the problems that tungsten leaching cannot be realized and it is difficult to implement in industry. It is easy to operate, Easy to industrialize and realize the effect of industrialization

Active Publication Date: 2015-09-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is said that a small amount of wolframite needs to be converted under extremely strong grinding and activation conditions (centrifugal planetary ball mill, centrifugal acceleration up to 45 times the acceleration of gravity of the earth), so it is difficult for industrial implementation
For this reason we have tried to optimize the conditions, using CaCl 2 The solution is activated by planetary ball grinding for a long time under the condition of 10 times the acceleration of gravity, but it is not effective at all, and the leaching of tungsten in the sulfuric acid-phosphoric acid solution cannot be achieved

Method used

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  • Method for extracting tungsten from wolframite or scheelite and wolframite mixed ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Wolframite concentrate (containing WO) with a particle size of less than 250 μm 3 71.3%) and calcium hydroxide by Put it into the grinding cylinder, add water according to the liquid-solid ratio of 0.5:1mL / g, and then ball mill for 2 hours. After the reaction is terminated, filter the tungsten-containing ore and dry it for 24 hours and perform X-ray diffraction analysis on it. The results are as follows: figure 1 shown. From figure 1 It can be seen that the characteristic spectral lines of scheelite appear after the reaction, and the diffraction peaks of wolframite broaden.

[0033] At 80°C, the above tungsten ore was treated with H 2 SO 4Concentration is 250g / L, H 3 PO 4 The mixed acid solution with a concentration of 350g / L was leached for 4h, the liquid-solid ratio was 10:1mL / g, and the leaching rate of tungsten was 99.2%.

Embodiment 2

[0035] Wolframite concentrate (containing WO) with a particle size of less than 250 μm 3 56.3%) and calcium hydroxide by Put it into the grinding cylinder, add water according to the liquid-solid ratio of 0.5:1mL / g, and then ball mill for 2 hours. After the reaction is terminated, use H 2 SO 4 Concentration is 250g / L, H 3 PO 4 The mixed acid solution with a concentration of 350g / L was leached for 4 hours, the liquid-solid ratio was 10:1mL / g, the reaction temperature was 80°C, and the leaching rate of tungsten was 98.7%.

Embodiment 3

[0037] Wolframite concentrate (containing WO) with a particle size of less than 250 μm 3 34.2%) and calcium oxide by Put it into the grinding cylinder, add water according to the liquid-solid ratio of 1:1mL / g, and then ball mill for 2 hours. After the reaction is terminated, the slurry is 2 SO 4 Concentration is 250g / L, H 3 PO 4 The mixed acid solution with a concentration of 350g / L was leached for 4 hours, the liquid-solid ratio was 10:1mL / g, the reaction temperature was 80°C, and the leaching rate of tungsten was 98.4%.

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Abstract

The invention provides a method for extracting tungsten from wolframite or scheelite and wolframite mixed ores. In the process of grinding the tungsten ores (wolframite, scheelite and wolframite mixed ores or tungsten fine silt), an alkaline calcium-containing substance is blended and fine grinding and pulp blending are performed, and then the obtained ore pulp is decomposed by use of phosphoric acid-sulfuric acid. The method has the advantages that the restriction that a sulfuric acid-phosphoric acid mixed system fails in treating the wolframite is broken through, the normal-temperature and normal-pressure efficient decomposition of the wolframite and the scheelite and wolframite mixed ores in the system is realized, and the requirements of the method on the raw material are reduced; for the wolframite, the decomposition rate can be above 98%, and for the scheelite and wolframite mixed ores, the decomposition rate can be above 97%; and the whole process is convenient to operate and prone to industrialization.

Description

technical field [0001] The invention belongs to the extraction of metal tungsten in the field of hydrometallurgy, in particular to an efficient method for extracting tungsten from wolframite or black and white tungsten mixed ore. Background technique [0002] At present, the industrial method of decomposing tungsten mineral raw materials is mainly NaOH decomposition process, which must be under extreme conditions (high temperature, high pressure and high alkali) to achieve effective decomposition of tungsten ore. The acid decomposition method of tungsten ore has a high thermodynamic reaction tendency, but due to kinetic limitations, the decomposition is often incomplete. [0003] For this reason, Chinese patent 102021328A proposes a sulfuric acid-phosphoric acid mixed acid synergistic system to treat scheelite, which realizes one-step efficient decomposition of scheelite. The method is carried out under acidic conditions, using low-cost, non-volatile sulfuric acid as the le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/36C22B3/06
CPCY02P10/20
Inventor 赵中伟张文娟
Owner CENT SOUTH UNIV
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