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A clean metallurgical method for scheelite

A scheelite, clean technology, applied in the field of hydrometallurgy, can solve the problems of affecting the decomposition rate, equipment corrosion, large acid mist, etc., and achieve the effect of overcoming the harsh environment, low cost, and less filter residues

Inactive Publication Date: 2018-03-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects existing in the existing scheelite smelting process, the object of the present invention is to provide a method for synergistically decomposing scheelite with inorganic acid and anion exchange resin, which can convert tungsten in scheelite into ionic state. The method 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 shortcomings of large acid mist and serious equipment corrosion caused by the use of concentrated hydrochloric acid in traditional acid decomposition, and realizes efficient cleaning of scheelite. break down

Method used

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  • A clean metallurgical method for scheelite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 10g scheelite (containing WO 3 49.75%, containing Ca 8.72%), 6.6g of pretreated D301 resin, 800mL of water were added to a 2L reaction vessel, stirred and heated to 40°C, then kept warm, and 3mol / L of HCl was gradually added to control the pH of the reaction system At 1.5-2.0, the reaction time is 6 hours. After the reaction, vacuum filter, wash the resin with water with pH=2.5, and then desorb with 20% ammonia water. The desorption solution is sent to ICP for testing, and the tungsten decomposition rate is 98.2%.

Embodiment 2

[0035] 10g scheelite (containing WO 3 49.75%, containing Ca 8.72%), 8.8g of pretreated D314 resin, 600mL of water were added to a 2L reaction vessel, stirred and heated to 60°C and then kept warm, gradually adding 6mol / L of HCl to control the pH of the reaction system At 1.0-1.5, the reaction time is 3 hours. After the reaction, vacuum filtration, the resin is washed with water with pH = 3.0, and then desorbed with 6mol / L sodium hydroxide solution. The desorption solution is sent to ICP, and the decomposition rate of tungsten is 99.7 %.

Embodiment 3

[0037]5g scheelite (containing WO 3 49.75%, containing Ca8.72%), 5.8g of pretreated D315 resin, 500mL of water were added to a 2L reaction vessel, stirred and heated to 80°C and then kept warm, gradually adding 6mol / L of HCl to control the pH of the reaction system The value is between 2.0 and 2.5, and the reaction time is 4 hours. After the reaction, vacuum filtration, the resin is washed with acidic water with pH 2.5, and then desorbed with 4mol / L potassium hydroxide. 98.5%.

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Abstract

The invention discloses a clean metallurgy method for scheelite. The clean metallurgy method comprises the following steps of mixing the scheelite, anion exchange resin and water and blending into slurry; gradually adding inorganic acid into the slurry for performing acid decomposition on the scheelite; filtering a mixture obtained by acid decomposition, and separating out resin loading ionized tungsten; and desorbing the resin loading the ionic state tungsten with alkali liquor to obtain a tungstate solution. According to the method, the inorganic acid and the anion exchange resin are utilized to cooperatively decompose the scheelite, and tungsten in the scheelite can be converted into an ionic state, so that the recovering efficiency of the tungsten is greatly improved, and the problem that the decomposition rate is influenced due to the fact that the scheelite is wrapped with tungstic acid in the traditional acid decomposition process is solved; and meanwhile, the defects of dense acid fog and serious corrosion of equipment due to the use of concentrated hydrochloric acid in the traditional acid decomposition process are overcome, and high-efficiency clean decomposition of the scheelite is realized.

Description

technical field [0001] The invention relates to a new method for clean metallurgy of scheelite, in particular to a method for efficiently recovering scheelite by anion exchange resin combined with acid to decompose scheelite, and belongs to the technical field of hydrometallurgy. Background technique [0002] Tungsten is an important strategic resource, and tungsten is mainly extracted from tungsten ore through metallurgical methods. Tungsten ore is divided into wolframite, scheelite, tungstenite, tungsten and so on. In my country's tungsten reserves, scheelite accounts for 70.4%, wolframite accounts for 29.0%. However, for a long time, scheelite has been seldom used by people because of its complex components, low grade, and difficulty in mining. Wolframite is easy to mine and less difficult in dressing and smelting, so it is very popular among people. With the continuous consumption of black tungsten ore, it has become an inevitable trend for scheelite resources to repla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B3/10C22B3/42C22B34/36
CPCC22B3/06C22B3/10C22B3/42C22B34/36Y02P10/20
Inventor 周康根龚丹丹彭长宏
Owner CENT SOUTH UNIV