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Method for extracting and separating tungsten and molybdenum in high-phosphorus mixed solution containing tungsten and molybdenum

A technology of mixing solution, tungsten and molybdenum, applied in the field of tungsten and molybdenum metallurgy, to achieve the effect of simple method

Active Publication Date: 2015-06-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the first time, the method adopts the method of adjusting and controlling the acid concentration and adding hydrogen peroxide to treat the high-phosphorus tungsten-molybdenum mixed solution, and then extracts, so that the tungsten and molybdenum in the high-phosphorus tungsten-molybdenum mixed solution can be effectively separated, which solves the problem that the existing technology cannot directly process high The problem of extraction and separation of tungsten and molybdenum in phosphorus-containing tungsten-molybdenum mixed solution also provides a new idea for the extraction and separation of tungsten and molybdenum in high-phosphorus tungsten-molybdenum mixed solution

Method used

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  • Method for extracting and separating tungsten and molybdenum in high-phosphorus mixed solution containing tungsten and molybdenum
  • Method for extracting and separating tungsten and molybdenum in high-phosphorus mixed solution containing tungsten and molybdenum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Organic phase composition (volume percentage): 80% TBP+10% P350+10% sulfonated kerosene.

[0038] Raw material liquid: A company uses sulfur-phosphorus mixed acid to obtain the leaching liquid of high-molybdenum scheelite, containing WO 3 120.5g / L, Mo 12.05g / L, phosphoric acid concentration 1.3mol / L, sulfuric acid concentration 1.1mol / L.

[0039] Feed liquid adjustment: add H at a concentration of 30% to it 2 o 2 solution, H 2 o 2 The added amount is 1.4 times of the total amount of moles of tungsten and molybdenum. get containing WO 3 114.1g / L, Mo 11.41g / L, WO 3 / Mo=10 / 1, a hydrogen peroxide-containing feed solution with a phosphoric acid concentration of 1.2 mol / L and a sulfuric acid concentration of 1 mol / L.

[0040] Extraction and separation: the above-mentioned organic phase and aqueous phase feed liquid are subjected to 6-stage countercurrent extraction under the condition of a ratio of 1 / 1 to obtain a loaded organic phase and a raffinate. Wherein, the loa...

Embodiment 2

[0043] Organic phase composition (volume percentage): 70% TBP+15% P350+15% sulfonated kerosene.

[0044] Raw material liquid: a company uses phosphate to decompose high-molybdenum scheelite under alkaline conditions. The leaching liquid contains WO 3 105.3g / L, Mo 5.27g / L, phosphorus concentration 0.82mol / L, sodium hydroxide concentration 0.4mol / L.

[0045] Feed liquid adjustment: add sulfuric acid thereinto, the final feed liquid containing sulfuric acid concentration is 1.4mol / L; And add concentration is 30% H 2 o 2 solution, H 2 o 2 The added amount is 0.8 times of the total amount of moles of tungsten and molybdenum. The final result contains WO 3 90.5g / L, Mo 4.53g / L, WO 3 / Mo=20 / 1, a hydrogen peroxide-containing feed solution with a phosphorus concentration of 0.7mol / L and a sulfuric acid concentration of 1.4mol / L.

[0046] Extraction and separation: the above-mentioned organic phase and aqueous phase feed liquid are subjected to 5-stage countercurrent extraction un...

Embodiment 3

[0049] Organic phase composition (volume percent): 80% TBP+20% benzene.

[0050] Raw feed liquid: feed liquid contains WO 3 8.21g / L, Mo 82.1g / L, phosphorus concentration 4.5mol / L, nitric acid concentration 2.6mol / L, hydrochloric acid concentration 1.9mol / L.

[0051] Feed liquid adjustment: add H to it 2 o 2 solution, H 2 o 2 The added amount is 1.2 times of the total amount of moles of tungsten and molybdenum. get containing WO 3 7.21g / L, Mo 72.1g / L, WO 3 / Mo=1 / 10, a hydrogen peroxide-containing feed solution with a phosphorus concentration of 4mol / L, a nitric acid concentration of 2.3mol / L, and a sulfuric acid concentration of 1.7mol / L.

[0052] Extraction and separation: the above-mentioned organic phase and aqueous phase feed liquid are subjected to 4-stage countercurrent extraction under the condition of a ratio of 2 / 1 to obtain a loaded organic phase and a raffinate. Wherein, the loaded organic phase is back-extracted with 1mol / L ammonium carbonate aqueous solutio...

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Abstract

The invention relates to a method for extracting and separating tungsten and molybdenum in a high-phosphorus mixed solution containing tungsten and molybdenum. The method comprises the following steps: adding hydrogen peroxide in the high-phosphorus mixed solution containing tungsten and molybdenum for acidity adjustment and control, and converting phosphotungstic acid and phosphomolybdic acid into peroxy-phosphotungstic acid and peroxy-phosphomolybdic acid; then, taking a mixture of tributyl phosphate (TBP) and methyl phosphate dimethyl heptyl ester (P350) as an extracting agent, extracting the peroxy-phosphomolybdic acid into an organic phase, and leaving the peroxy-phosphotungstic acid in an aqueous phase; from now on, after decomposing the peroxy-phosphotungstic acid in extraction raffinate in the way of heating or ultraviolet irradiation or introduction of sulfur dioxide, extracting tungsten in the solution again with a fresh mixed extracting agent, and finally realizing extraction and separation of tungsten and molybdenum from complex material liquid. The method is small in tungsten co-extraction loss, can effectively solve the extraction and separation problem of tungsten and molybdenum in the high-phosphorus mixed solution containing tungsten and molybdenum, and is easy to realize industrialization.

Description

technical field [0001] The invention belongs to the field of tungsten-molybdenum metallurgy, and in particular relates to a method for extracting and separating tungsten-molybdenum in a high-phosphorus tungsten-molybdenum mixed solution. Background technique [0002] Tungsten is an indispensable strategic metal in the field of national defense and occupies an important position in the national military strategic reserve. In view of the current situation of resources, it is an inevitable trend to replace black tungsten with scheelite, and it is a strategic choice for the sustainable development of my country's tungsten industry. However, my country's scheelite resource endowment is relatively poor, and there are many impurities such as molybdenum. Tungsten and molybdenum belong to the VIB group in the periodic table of elements. Due to the influence of lanthanide shrinkage, the properties of tungsten and molybdenum are very similar. The separation of molybdenum has become a ...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B3/44C22B34/34C22B34/36
CPCY02P10/20
Inventor 赵中伟李永立
Owner CENT SOUTH UNIV
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