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Method for extracting tungsten or molybdenum from tungstate solutions or molybdate solutions

A technology of tungstate and molybdate, which is applied in the field of metallurgy, can solve problems such as excessive waste water, environmental hazards, molybdenum or tungsten dissolution and loss, and achieve the effect of efficient extraction

Active Publication Date: 2019-09-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] To extract tungsten or molybdenum from tungstate solution or molybdate solution, the usual method is to remove impurities first, and then obtain tungsten or molybdenum by extraction or ion exchange, which will produce a lot of waste water and seriously endanger the environment.
Moreover, impurities such as phosphorus, arsenic, and silicon that can form soluble heteropolyacids with tungsten or molybdenum, when molybdenum or tungsten is separated by precipitation of molybdenum acid or tungsten acid, will cause dissolution loss of molybdenum or tungsten, and the higher the concentration of phosphorus, arsenic, and silicon, the loss bigger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The thick sodium tungstate solution in the present embodiment contains WO 3 100g / L, P 0.5g / L, Si 0.2g / L, As 0.1g / L.

[0031] This embodiment proposes a method for extracting tungsten from tungstate solution, comprising the following steps:

[0032] 1) According to the molar ratio of calcium to tungsten of 1:1, mix and react the tungstate solution and the calcium compound containing calcium chloride at 100°C for 2 hours to obtain a solid precipitate containing calcium tungstate. In other embodiments, one or more calcium-containing compounds of calcium chloride, calcium oxide, calcium hydroxide, calcium nitrate, and calcium sulfate may also be used.

[0033]2) According to the molar ratio of hydrogen peroxide to tungsten in the solid precipitate containing calcium tungstate 6:1, the solid precipitate containing calcium tungstate obtained in step 1) was mixed with hydrogen peroxide at 20°C for 0.5 hours , and filtered to obtain calcium peroxytungstate solution. The cal...

Embodiment 2

[0036] The APT crystallization mother liquor in the present embodiment contains WO 3 35g / L, P 0.08g / L, Si 0.01g / L, As 0.01g / L.

[0037] This embodiment proposes a method for extracting tungsten from tungstate solution, comprising the following steps:

[0038] 1) According to the molar ratio of calcium to tungsten of 2:1, the APT crystallization mother liquor and calcium hydroxide were mixed and reacted at 150°C for 0.1 hour to obtain a solid precipitate containing calcium tungstate.

[0039] 2) According to the molar ratio of hydrogen peroxide to tungsten in the solid precipitate containing calcium tungstate of 1:1, the solid precipitate containing calcium tungstate obtained in step 1) was mixed with hydrogen peroxide at 60°C for 6 hours , and filtered to obtain calcium peroxytungstate solution. The calcium peroxytungstate solution contains P0.002g / L, Si0.002g / L, As0.001g / L.

[0040] 3) Mix the calcium peroxytungstate solution with the ammonium salt solution according to th...

Embodiment 3

[0042] The phosphotungstic heteropolyacid solution in this embodiment contains WO 3 95g / L, P 35g / L, Si 10g / L, As 6g / L.

[0043] This embodiment proposes a method for extracting tungsten from tungstate solution, comprising the following steps:

[0044] 1) According to the molar ratio of calcium to tungsten of 1.5:1, mix and react the phosphotungstic heteropolyacid solution and calcium sulfate calcium-containing compound at 20°C for 6 hours to obtain a solid precipitate containing calcium tungstate. In other embodiments, one or more calcium-containing compounds of calcium chloride, calcium oxide, calcium hydroxide, calcium nitrate, and calcium sulfate may also be used.

[0045] 2) According to the molar ratio of hydrogen peroxide to tungsten in the solid precipitate containing calcium tungstate 4:1, the solid precipitate containing calcium tungstate obtained in step 1) was mixed with hydrogen peroxide at 30°C for 3 hours , and filtered to obtain calcium peroxytungstate soluti...

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PUM

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Abstract

The invention relates to a method for extracting tungsten or molybdenum from tungstate solutions or molybdate solutions. The method includes the following steps that (1) the tungstate solutions or themolybdate solutions and calcium-containing compounds are mixed for reaction to obtain solid sediments containing calcium tungstate or solid sediments containing calcium molybdate; and (2) the solid sediments containing calcium tungstate or the solid sediments containing calcium molybdate obtained in the first step are mixed with hydrogen peroxide for reaction, filtering is conducted to obtain peroxy calcium tungstate solutions or peroxy calcium molybdate solutions, or the solid sediments containing calcium tungstate or the solid sediments containing calcium molybdate obtained in the first step are mixed with hydrogen peroxide and ammonium salt for reaction, filtering is conducted to obtain peroxy calcium tungstate solutions or peroxy calcium molybdate solutions, and the ammonium salt is one or more of ammonium carbonate, ammonium oxalate, ammonium sulfate and ammonium phosphate. The tungsten or the molybdenum can be efficiently extracted from the tungstate solutions or the molybdate solutions by means of the method.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for extracting tungsten or molybdenum from tungstate solution or molybdate solution. Background technique [0002] To extract tungsten or molybdenum from tungstate solution or molybdate solution, the usual method is to remove impurities first, and then obtain tungsten or molybdenum through extraction or ion exchange, which will generate a lot of waste water and seriously endanger the environment. Moreover, impurities such as phosphorus, arsenic, and silicon that can form soluble heteropolyacids with tungsten or molybdenum, when molybdenum or tungsten is separated by precipitation of molybdenum acid or tungsten acid, will cause dissolution loss of molybdenum or tungsten, and the higher the concentration of phosphorus, arsenic, and silicon, the loss bigger. Contents of the invention [0003] After our in-depth research, we found that calcium tungstate and calcium mol...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/34C22B34/36
CPCC22B3/44C22B34/34C22B34/36Y02P10/20
Inventor 陈星宇赵中伟季磊刘旭恒
Owner CENT SOUTH UNIV
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