Method for decomposing scheelite

A technology of scheelite and extraction, applied in the direction of improving process efficiency, etc., can solve the problems of hindered diffusion, slow down the speed of reaction, and difficulty in phase separation, and achieve the effects of wide application, increased concentration, and simple extraction equipment

Inactive Publication Date: 2014-05-21
JIANGXI UNIV OF SCI & TECH +1
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Problems solved by technology

[0003] However, in the prior art, hydrochloric acid is directly used to decompose scheelite. During the decomposition process, a layer of tungstic acid hydrate film will be formed on the surface of scheelite particles, which will hinder the diffusion of react

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  • Method for decomposing scheelite

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[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in further detail below in conjunction with specific embodiments:

[0023] Weigh 10g of scheelite with a particle size grade of (+300 mesh, -250 mesh), add 2mol L-1 hydrochloric acid 100mL and the same amount of phosphoric acid m w / m po4 3- =3:1, the decomposition temperature is 90°C, the decomposition time is 2.5h, the stirring speed is 900 rpm, and the leaching rate of tungsten ore is 99.6%. Then use a volume ratio of 12% N235, 20% n-octanol, and 68% kerosene as the organic relative tungsten decomposition liquid for extraction. The ratio is 1:1, and the mixing time is 5 minutes. The extraction rate of tungsten can reach 99.90%. Using 50ml and 1.5mol / L NaOH solution in a ratio of 1:1, the stripping rate can reach 98%. The organic phase of stripping is recycled and used. After stripping, the liquid water bath is heated to 40°C, and then hydrochloric acid is added dropwise to ac...

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Abstract

The invention provides a method for decomposing scheelite. The method comprises the following steps: carrying out complexing decomposition by adopting hydrochloric acid with a certain concentration and phosphoric acid with a certain ratio; after decomposing, enabling tungsten to directly enter a decomposed solution in a manner of heteropoly acid; filtering to obtain a filtrate; extracting tungstophosphoric heteropoly acid in the filtrate by using N235; extracting and separating; carrying out stripping on a loading organic phase by using NaOH; adding calcium sulfate into raffinate; filtering to obtain the hydrochloric acid for circular utilization; circularly utilizing a stripping organic phase; acidifying a stripping solution to adjust the pH (Potential of Hydrogen); evaporating and crystallizing to obtain a sodium phosphotungstate crystal. The method for decomposing the scheelite has the advantages that a traditional scheelite single acid decomposition concept is changed, and the hydrochloric acid and the phosphoric acid are used for carrying out the complexing decomposition on the scheelite to improve the leaching efficiency of the tungsten; the scheelite decomposed solution is treated by an extraction method to improve the concentration of the tungsten and reduce the water use amount of a tungsten smelting process; the water circulation of the whole process is easy to realize; the regeneration of a decomposition reagent is realized by using the calcium sulfate and the production cost is greatly reduced; prepared heteropolyphosphotungstate has a very wide application.

Description

technical field [0001] The invention relates to the extraction of rare high melting point tungsten in the field of hydrometallurgy, in particular to a method for decomposing scheelite. Background technique [0002] my country's proven scheelite concentrate reserves are 1 million tons, and black tungsten concentrate is only about 200,000 tons. Because scheelite ore has the characteristics of complex components, low grade, associated with other metals, and difficult development and utilization, the current tungsten smelting and production industry in my country is dominated by black tungsten mineral raw materials, and wolframite reserves are increasingly exhausted. With the increasingly depleted tungsten mineral wolframite, it is imminent and significant to replace wolframite with scheelite in tungsten smelting. [0003] However, in the prior art, hydrochloric acid is directly used to decompose scheelite. During the decomposition process, a layer of tungstic acid hydrate film...

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Application Information

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IPC IPC(8): C22B34/36C22B3/06C22B3/26
CPCY02P10/20
Inventor 杨幼明谢芳浩聂华平叶信宇郭名亮刘小平郭华彬蔡忠东
Owner JIANGXI UNIV OF SCI & TECH
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