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Preparation method of sulfo-molybdate for separating molybdenum from tungstate solution

A technology of thiomolybdate and tungstate, applied in the direction of improving process efficiency, etc., can solve the problems of difficult separation process, and achieve the effects of shortening operation time, simplifying steps and reducing costs

Inactive Publication Date: 2011-09-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the chemical properties of tungsten and molybdenum are very similar due to the effect of lanthanide contraction, which makes the separation process very difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The sodium tungstate solution prepared in the laboratory contains Mo: 0.50g / L, WO 3 :50g / L, take 1L material solution, add dropwise sodium hydroxide solution to adjust the pH to 12.99, add vulcanizing agent to react, make the free S ion concentration 1.5g / L, set the vulcanization temperature and time in the water bath constant temperature oscillator respectively It is: 70℃, 2h, the oscillation frequency is 120r / min. The ion exchange resin static adsorption method was used to detect the concentration of molybdenum in the adsorbed liquid at 0.00565g / L, and the sulfurization rate of molybdenum was 98.87% calculated by subtraction.

Embodiment 2

[0021] The potassium tungstate solution prepared in the laboratory contains Mo: 0.50g / L, WO 3 :50g / L, take 1L material solution, add hydrochloric acid solution dropwise to adjust pH to 7.02, add vulcanizing agent to react, make free S ion concentration 0g / L, set vulcanization temperature and time in water bath constant temperature oscillator as: 70 ℃, 2h, the oscillation frequency is 120r / min. The ion exchange resin static adsorption method was used to detect the concentration of molybdenum in the adsorbed solution at 0.0514g / L, and the sulfurization rate was 89.72%.

Embodiment 3

[0023] The sodium tungstate solution prepared in the laboratory contains Mo: 0.50g / L, WO 3 :50g / L, take 1L material solution, add dropwise sodium hydroxide solution to adjust the pH to 11.02, add vulcanizing agent to react, make the free S ion concentration 2.5g / L, set the vulcanization temperature and time in the water bath constant temperature oscillator respectively It is: 70℃, 2h, the oscillation frequency is 120r / min. The ion exchange resin static adsorption method was used to detect the concentration of molybdenum in the adsorbed solution at 0.0086g / L, and the sulfurization rate was 98.28%.

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PUM

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Abstract

The invention discloses a preparation method of sulfo-molybdate for separating molybdenum from tungstate solution. Phosphorus pentasulfide serves as vulcanizing agent; after the vulcanizing agent is added into molybdenum-contained tungstate solution, the vulcanizing agent is hydrolyzed to release sulphur ions; the sulphur ions and molybdate are subject to vulcanization reaction to generate sulfo-molybdate; and tungsten still exists in the form of tungstate ion. The vulcanizing agent used by the method has the advantages of high sulphur content and low price, and the preparation cost of the sulfo-molybdate can be obviously lowered.

Description

Technical field: [0001] The invention belongs to the field of hydrometallurgical purification of tungsten, and is used for the preparation of thiomolybdate for separating molybdenum from a tungstate solution. Background technique: [0002] In the process of processing tungsten mineral raw materials to produce various pure tungsten products (including pure compounds and pure metals), the separation of tungsten and molybdenum is a technical problem. On the one hand, because the content of molybdenum in tungsten products is extremely strict, according to the GB 10116-88 standard, the content of molybdenum in APT-0 grade products is not more than 0.002% (20ppm). On the other hand, due to the effect of lanthanide shrinkage, the chemical properties of tungsten and molybdenum are very similar, which makes the separation process very difficult. [0003] So far, the separation of tungsten and molybdenum is mainly based on the difference in the properties of tungsten and molybdenum compound...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/34C22B34/36
CPCY02P10/20
Inventor 赵中伟张伟光李江涛曹才放
Owner CENT SOUTH UNIV
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