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A method for decomposing scheelite

A technology of scheelite and decomposition reaction, which is applied in the direction of improving process efficiency, etc., can solve the problems affecting the decomposition rate and scheelite wrapping, etc., and achieve the effect of clean operating environment, obvious synergy and reduced reagent cost

Active Publication Date: 2018-06-05
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects existing in the existing scheelite smelting process, the object of the present invention is to provide a method for decomposing scheelite with cation exchange resin and phosphoric acid to directly obtain a phosphotungstic heteropolyacid solution with higher purity; the method It solves the problem that scheelite is wrapped by tungstic acid in the process of traditional acid decomposition and affects the decomposition rate. At the same time, it overcomes the problem of traditional acid decomposition using concentrated acid to corrode equipment, and realizes efficient and clean decomposition of scheelite.

Method used

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  • A method for decomposing scheelite

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Experimental program
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Effect test

Embodiment 1

[0027] Mix 9.6g of pretreated (conventional acidification process) 732 resin, 0.24mL of phosphoric acid with a mass fraction of 85%, and 300mL of water into a 1L reaction vessel, stir and heat to 30°C, then add 10g of scheelite (including WO 3 49.75%, containing Ca8.72%), start timing, finish the reaction after 2 hours, vacuum filter, send the filtrate to ICP, and the decomposition rate of tungsten is 96.4%.

Embodiment 2

[0029] Mix 9.6g of pretreated 732 resin, 0.36mL of phosphoric acid with a mass fraction of 85%, and 200mL of water into a 1L reaction vessel, stir and heat to 40°C, then add 10g of scheelite (containing WO 3 49.75%, containing Ca8.72%), start timing, finish the reaction after 1h, vacuum filter, send the filtrate to ICP, and the decomposition rate of tungsten is 98.2%.

Embodiment 3

[0031] Mix 14.4g of pretreated 732 resin, 0.12mL of phosphoric acid with a mass fraction of 85%, and 200mL of water into a 1L reaction vessel, stir and heat to 60°C, then add 10g of scheelite (containing WO 3 49.75%, containing Ca8.72%), start timing, finish the reaction after 3 hours, vacuum filter, send the filtrate to ICP, and the decomposition rate of tungsten is 94.7%.

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Abstract

The invention discloses a scheelite decomposing method. The method comprises the following steps: after cation exchange resins and phosphoric acid solution are heated and uniformly mixed, scheelite is added for decomposing; and after the decomposing reaction is finished, phosphotungstic heteropoly acid solution is obtained through filtration and separation. The method uses the cation exchange resins for cooperating with the phosphoric acid to decompose the scheelite to directly obtain the phosphotungstic heteropoly acid solution with higher purity, so that the problem of influence on the resolution ratio by wrapping of the scheelite by tungstic acid in the process of decomposing the scheelite by traditional acid is solved, the problem of equipment corrosion due to use of concentrated acid in traditional acid decomposition is overcome, and the high-efficiency clean decomposion of the scheelite is realized.

Description

technical field [0001] The invention relates to a method for decomposing scheelite, in particular to a method for decomposing scheelite with cation exchange resin and phosphoric acid, and belongs to the technical field of hydrometallurgy. Background technique [0002] Tungsten is an important strategic metal in my country and plays an indispensable role in contemporary high-tech new materials. It is mainly extracted from tungsten ore through metallurgical methods. Most of the tungsten ore is scheelite, accounting for more than 70%, and the rest is wolframite. Over the past hundred years, wolframite resources have been continuously consumed and exhausted, while scheelite has hardly been developed and utilized. It has become an inevitable trend to replace wolframite with scheelite. Due to increasingly stringent environmental protection, traditional scheelite decomposition methods, such as sodium carbonate decomposition method and hydrochloric acid decomposition method, are no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/36C22B3/06C22B3/42
CPCC22B3/06C22B3/20C22B34/36Y02P10/20
Inventor 周康根龚丹丹彭长宏
Owner CENT SOUTH UNIV
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