Method and system for decomposing scheelite concentrate

A technology for concentrate and scheelite, applied in the field of decomposing scheelite concentrate, can solve the problems of difficult separation of tungsten and phosphorus, reduce the decomposition cost of scheelite concentrate, and affect the quality of products by phosphorus, and achieve easy industrial-scale production and operation. The effect of strong performance, simple process and equipment

Active Publication Date: 2016-09-07
GANZHOU NONFERROUS METALLURGICAL RES INST
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method and system for decomposing scheelite concentrate, so as to overcome the problem that tungsten and phosphorus are difficult to separate in the traditional acid decomposition process, and phosphorus is easy to affect the quality of the product; phosphorus-free oxalic acid is used instead of sulfur and phosphorus Mixed acid, the oxalate in oxalic acid can form a complex with tungsten, and

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  • Method and system for decomposing scheelite concentrate
  • Method and system for decomposing scheelite concentrate

Examples

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Example Embodiment

[0025] Example 1: Oxalic acid decomposes scheelite concentrate, and 10.0kg scheelite concentrate is decomposed in a 50L reactor. The WO of scheelite concentrate 3 The content is 25%, the amount of oxalic acid added is 5.0kg, the decomposition temperature is 25°C, the reaction time is 14h, and the decomposition rate of tungsten in the scheelite concentrate reaches 99.21%. The filtered decomposition solution (tungsten oxalate solution) contains tungsten concentration of 24.18g / L, Ca concentration of 3.12g / L, Zn concentration of 3.93g / L, Mg concentration of 4.34g / L, and Fe concentration of 4.50g / L After extraction with N1923, the extraction rate of tungsten reaches 99.51%. After the loaded organic phase is back-extracted with ammonium chloride, the obtained ammonium tungstate solution can be evaporated and crystallized to obtain APT zero grade product. After the decomposition residue is treated with sulfuric acid, the concentration of sulfuric acid is 2mol / L, and the treatment time...

Example Embodiment

[0026] Example 2: Oxalic acid decomposes scheelite concentrate, and 10.0kg scheelite concentrate is decomposed in a 50L reactor. The WO of scheelite concentrate 3 The content is 45%, the amount of oxalic acid added is 8.0kg, the decomposition temperature is 55°C, the reaction time is 10h, and the decomposition rate of tungsten in the scheelite concentrate reaches 99.54%. The filtered decomposition solution (tungsten oxalate solution) contains tungsten concentration of 43.52g / L, Ca concentration of 1.92g / L, Zn concentration of 2.31g / L, Mg concentration of 2.44g / L, and Fe concentration of 2.68g / L After extraction with N1923, the extraction rate of tungsten reaches 99.55%. After the loaded organic phase is back-extracted with ammonium chloride, the obtained ammonium tungstate solution can be evaporated and crystallized to obtain the APT zero grade product. After the decomposition residue is treated with sulfuric acid, the concentration of sulfuric acid is 1mol / L, and the treatment ...

Example Embodiment

[0027] Example 3: Oxalic acid decomposes scheelite concentrate, and 10.0kg scheelite concentrate is decomposed in a 50L reactor. The WO of scheelite concentrate 3 The content is 50%, the amount of oxalic acid added is 9.0kg, the decomposition temperature is 55°C, the reaction time is 10h, and the decomposition rate of tungsten in the scheelite concentrate reaches 99.54%. The filtered decomposition solution (tungsten oxalate solution) contains tungsten concentration of 48.36g / L, Ca concentration of 2.10g / L, Zn concentration of 2.61g / L, Mg concentration of 2.94g / L, and Fe concentration of 3.11g / L After extraction with N1923, the extraction rate of tungsten reaches 99.57%. After the loaded organic phase is back-extracted with ammonium chloride, the obtained ammonium tungstate solution can be evaporated and crystallized to obtain APT zero-grade products. After the decomposition residue is treated with sulfuric acid, the concentration of sulfuric acid is 3mol / L, and the treatment tim...

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Abstract

The invention discloses a method for decomposing scheelite concentrate. The scheelite concentrate is decomposed through oxalic acid, and decomposing liquid and decomposing slag are obtained through filtration; the decomposing liquid is subjected to extraction, reverse extraction and evaporative crystallization, and APT products are obtained; and the decomposing slag is treated through sulfuric acid, regenerated oxalic acid is obtained, and the regenerated oxalic acid can return to decompose the scheelite concentrate and can be repeatedly used. According to the method, the oxalic acid is adopted to directly decompose the scheelite concentrate under the normal pressure condition, and the decomposing rate of tungsten trioxide in the scheelite concentrate can reach 99% or above; and after the decomposing liquid is subjected to extraction, the tungsten extraction rate can reach 99% or above, and the zero-level APT products can be obtained in the whole process. By means of the method, the scheelite concentrate decomposing cost can be remarkably reduced, decomposing equipment is simplified, and operation is convenient.

Description

technical field [0001] The invention relates to a method for decomposing scheelite concentrate, belonging to the technical field of hydrometallurgy. Background technique [0002] The traditional acid method to decompose scheelite concentrate is generally decomposed by hydrochloric acid, and calcium chloride solution and tungstic acid precipitation are obtained after decomposition; after tungstic acid precipitation is washed, ammonium tungstate solution is obtained through ammonia dissolution. However, this method is only suitable for processing low-impurity scheelite concentrate, and the operating environment is poor, and the equipment is highly corrosive. This method has been basically eliminated as the main process. [0003] For a long time, my country's tungsten concentrate mining has been dominated by black tungsten ore resources, and the output once accounted for more than 90% of the output of wolframite concentrate. At present, the reserves of wolframite ore have been ...

Claims

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Application Information

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IPC IPC(8): C22B3/16C22B3/02C22B34/36
CPCC22B3/02C22B3/165C22B34/36Y02P10/20
Inventor 陈冬英许亮杨新华赖兰萍陈后兴彭少华周洁英洪侃李忠岐温祥张选旭陈淑梅伍莺
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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