Method for extracting tungsten from wolframite or scheelite and wolframite mixture ore through adding of high-phosphorus scheelite

A scheelite and wolframite technology, applied in the field of hydrometallurgy, can solve the problems of high price of phosphoric acid and increased process cost, and achieve the effects of easy industrialization, convenient operation and efficient decomposition

Active Publication Date: 2015-09-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In addition, according to reaction (1), it can be seen that phosphoric acid is a consumption reagent in the sulfuric acid-phosphoric acid leaching process, and because phosphoric acid is relatively expensive, the process cost is greatly increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Wolframite concentrate (including WO 3 71.3%) and high phosphorus scheelite (containing WO 3 14.8%, P 2 o 5 27.6%) by After batching, add it to the ball mill tank, add water at a liquid-solid ratio of 0.5:1mL / g, and then ball mill it 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 200g / L was leached for 4 hours, the liquid-solid ratio was 10:1mL / g, the reaction temperature was 80°C, the leaching rate of tungsten was 99.2%, and the leaching rate of phosphorus was 98.1%. After the filtrate extracts tungsten with a tertiary amine-based extractant, the mother liquor is supplemented with lost sulfuric acid and returns to a new round of leaching. Under the same decomposition conditions, the leaching rate of tungsten is 98.9%.

Embodiment 2

[0028] Wolframite concentrate (including WO 3 56.3%) and high phosphorus scheelite (containing WO 3 14.8%, P 2 o 5 27.6%) by After batching, add it to the ball mill tank, and after the ball mill reaction for 2 hours, use the H 2 SO 4 Concentration is 250g / L, H 3 PO 4The mixed acid solution with a concentration of 200g / 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

[0030] Wolframite concentrate (including WO 3 34.2%) and high phosphorus scheelite (containing WO 3 14.8%, P 2 o 5 27.6%) by After batching, add it to the ball mill tank, add water at a liquid-solid ratio of 0.5:1mL / g, and then ball mill it 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 200g / 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 98.3%.

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Abstract

The invention provides a method for tungsten from wolframite or scheelite and wolframite mixture ore through adding of high-phosphorus scheelite. In the ore grinding process of tungsten mineral raw materials (wolframite or scheelite and wolframite mixture ore), the high-phosphorus scheelite is added, fine grinding and pulp mixing are carried out, and obtained ore pulp is decomposed through phosphoric acid-sulfuric acid; after the reaction is finished, the tungsten is extracted from an obtained leaching agent, then, sulfuric acid is supplemented again, and mineral leaching is carried out again. The method has the advantages that the limitation that a sulfuric acid-phosphoric acid mixing system cannot treat the wolframite and the scheelite and wolframite mixture ore is broken through, and the wolframite and the scheelite and wolframite mixture ore is efficiently decomposed at the constant temperature and constant pressure under the system; phosphorus in the high-phosphorus scheelite can be comprehensively utilized, and meanwhile, the decomposing rate of the tungsten ore can reach more than 97 percent; the added phosphorus can generate phosphoric acid in the decomposing process, the method can be used for making up the phosphoric acid consumed in the decomposing process, energy is saved, and the leaching cost is reduced; and the whole technological process is convenient to operate, and the industrialization is easily achieved.

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
Inventor 赵中伟张文娟陈星宇刘旭恒
Owner CENT SOUTH UNIV
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