Method for extracting tungsten from tungsten mineral by using soda and adopting high-pressure leaching process

A high-pressure leaching and soda technology, which is applied in the field of extracting tungsten from tungsten minerals by soda high-pressure leaching, can solve the problems of high temperature and pressure of soda pressure cooking, large soda excess coefficient, and waste of heat energy, etc., and achieve high decomposition rate and stable decomposition rate Effect

Active Publication Date: 2013-10-02
江西省修水赣北钨业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soda high-pressure leaching method can solve these problems, but the temperature and pressure of soda pressure cooking are high, the heat energy waste of intermittent operation is serious, and the excess coefficient of soda is large, generally about 4 times, and it is also a difficult problem to recover the remaining soda in the solution

Method used

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  • Method for extracting tungsten from tungsten mineral by using soda and adopting high-pressure leaching process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Secondary pressure cooking of scheelite concentrate primary pressure cooking slag. Take scheelite concentrate for primary pressure cooking, add 116g of soda, the excess coefficient is 2.1, mix with 13g of solid alkali, 12g of alumina and 1200ml of water, the liquid-solid ratio is 4:1; Pressure cook for 4.0 hours. Afterwards, the pressure was reduced and the material was filtered, and the slag of the second pressure cooking was sampled and analyzed. The slag contained tungsten: 0.48%, and it was discarded and piled up; 3 : 14.47g / l; leaching rate of tungsten ore: 99.44%.

[0016] Scheelite concentrate is pressure-cooked once. Measure the secondary pressure cooking filtrate, add 250g scheelite fine powder to mix and adjust the slurry, control the liquid-solid ratio to 5:1, and leaching for 4.0 hours at a temperature of 230°C and a pressure of 2.5MPa. Afterwards, the pressure is reduced and the material is filtered, and the residue is transferred to the second...

Embodiment 2

[0017] Example 2 Secondary pressure cooking of scheelite middle ore primary pressure cooking slag. Take tungsten middling ore for one pressure cooking slag, add 146g soda, excess coefficient 2.5, mix with 13g solid alkali, 12g alumina and 1200ml water, liquid-solid ratio 3:1; Cook for 4.0 hours. Afterwards, the pressure is reduced and the material is filtered, and the slag of the second pressure cooking is sampled and analyzed. The slag contains tungsten: 0.36%, and it is discarded and piled up; 3 : 53.30g / l; leaching rate of tungsten ore: 99.35%.

[0018] Scheelite middlings are pressure-cooked once. Measure the filtrate of the secondary pressure cooking, add 345g of tungsten medium ore fine powder to mix and adjust the slurry, control the liquid-solid ratio of 3:1, and leach for 4.0 hours at a temperature of 180°C and a pressure of 0.9MPa. Afterwards, the pressure is reduced and the material is filtered, and the slag is transferred to the secondary pressure cooking ingred...

Embodiment 3

[0019] Example 3 Secondary pressure cooking of scheelite middle ore primary pressure cooking slag. Take scheelite middle ore pressure-cooked slag once, add 147g soda, the excess coefficient is 2.5, mix with 12g solid alkali, 6.5g alumina and 1100ml water, the liquid-solid ratio is 3:1; Sub-pressure cook for 2.0 hours. Afterwards, the pressure was reduced and the material was filtered, and the slag was sampled and analyzed for the second time. The slag contained tungsten: 0.11%, and it was discarded and piled up; 3 : 40.41g / l; leaching rate of tungsten ore: 99.79%.

[0020] Scheelite middlings are pressure-cooked once. Measure the filtrate of the secondary pressure cooking, add 345g of scheelite medium ore fine powder to mix and adjust the slurry, control the liquid-solid ratio of 3:1, and leach for 2.0 hours at a temperature of 230°C and a pressure of 2.4MPa. Afterwards, the pressure is reduced and the material is filtered, and the residue is transferred to the secondary pr...

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Abstract

The invention discloses a method for extracting tungsten from tungsten mineral by using soda and adopting high-pressure leaching process, comprising the following steps: adding soda and additives into primary tungsten autoclaving slag, carrying out secondary autoclaving at high temperature and pressure; separating the leaching solution from the slag; carrying out primary autoclaving to the tungsten by the leaching solution; separating the primary autoclaving slag from the crude sodium tungstate solution, wherein the primary autoclaving slag is used as the raw material; and mixing the tungstate with the secondary autoclaving leaching solution to prepare slurry. The liquid-solid ratio is controlled to be (3-5):1 in the step of adding the soda and the additives into the primary autoclaving slag and mixing to prepare the slurry, and the soda has the excess coefficient of 2.0-2.5. The liquid-solid ratio is controlled to be (3-5):1 in the step of mixing the tungstate with the secondary autoclaving leaching solution to prepare the slurry. The primary autoclaving temperature and the secondary autoclaving temperature are both 170-240 DEG C, the primary autoclaving pressure and the secondary autoclaving pressure are both 0.9-2.8MPa, and the primary autoclaving time and the secondary autoclaving time are both 2-4 hours. The additives are solid caustic soda and alumina. The method adopts the soda to autoclave the tungsten mineral to extract tungsten at counterflow by using soda at high pressure, so that the leaching rate of the tungsten mineral is more than 99%, the content of WO3 in the tungsten slag is less than 1.0%, the use amount of soda is reduced, and the content of soda in the leaching solution is reduced effectively.

Description

technical field [0001] The invention relates to a method for extracting tungsten in tungsten smelting, in particular to a method for extracting tungsten in tungsten minerals by using a soda high-pressure leaching method. Background technique [0002] At present, the decomposition and leaching methods for various types of tungsten minerals mainly include caustic soda leaching method, combined pressure cooking method, fluoride decomposition method, acid decomposition method, and soda high pressure leaching method. Among them, the caustic soda leaching method is not very ideal for the decomposition rate of scheelite and tungsten ore, and the excess coefficient of caustic soda is large, and the WO in slag 3 Later, Li Honggui invented the patented technology of introducing a mechanical activation process into the above method. Although the decomposition rate has been improved to a certain extent and the excess coefficient of caustic soda has been reduced, the tungsten in tungsten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/12C22B34/36
CPCY02P10/20
Inventor 曾欣荣张展飞李建辉姜文伟文百开梁卫东
Owner 江西省修水赣北钨业有限公司
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