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Method for separating and extracting tungsten-molybdenum from mixed solution of tungstate-molybdate

A technology of mixed solution and tungsten molybdate, which is applied in the field of separation and extraction of tungsten and molybdenum from mixed solution of tungsten molybdate, can solve the problems of unsuitable mixed solution of tungsten molybdate, and achieves low production cost, strong process adaptability, and easy operation. easy effect

Inactive Publication Date: 2010-11-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method improves the efficiency and effectiveness of producing pure tantalum from crude titanic acid (TTA). By substituting calcium for lime instead of calcium oxychloride, this results in efficient separations between both elements while maintaining their value. Additionally, it allows reuse of decomposed material without generating waste or polluting any areas around them. Overall, these technical improvements improve the quality and yield of purified TA products that can be further processed downstream.

Problems solved by technology

This technical problem addressed in this patents relates to efficiently extracting both tantalum (Ta), niobium (Nb2), titmobalt (TiMo). Current techniques involve expensive procedures involving complicated steps like electroplatning nickels, solid phase diffusion/electrowinsis, liquid nitrogen reduction, argon oxydride treatment, and other complex operations requiring highly skilled workers. Therefore, new ways to isolate tungstates without relying heavily upon hydrometric acids would provide better efficiency and safety during material handling activities while minimizing costs involved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A mixed solution formed by dissolving pure sodium molybdate and pure sodium tungstate, containing Mo35.6g / L, WO 3 10.7g / L, adjust the pH value to 8.3, add calcium carbonate according to 5 times the stoichiometric number of artificial scheelite, stir at 90°C for 1.5 hours to precipitate the tungsten in the solution, filter to obtain artificial scheelite and molybdenum filtrate , the filtrate contains Mo33.8g / L, WO 3 0.1g / L, add hydrochloric acid to artificial scheelite according to 3 times its decomposition chemical reaction, stir at 70°C for 2.0 hours, filter and wash to obtain artificial scheelite, artificial scheelite is obtained by ammonia dissolution and evaporation crystallization Ammonium paratungstate containing 0.01% Mo.

Embodiment 2

[0023] The solution obtained by leaching nickel-molybdenum ore by oxidizing and roasting sodium carbonate and sodium hydroxide mixed alkali, adding acid to adjust the pH to 3.0, first undergoing adsorption transformation with weak base anion resin, and then purifying and removing impurities with magnesium salt, the composition of the ammonium molybdate solution is: Mo 85.3g / L, P 0.01g / L, As 0.004g / L, SiO 2 0.10g / L, WO 3 0.52g / L, pH value 8.2, add calcium carbonate according to 25 times the stoichiometric number of artificial scheelite, stir at 85°C for 2.5 hours to precipitate tungsten in the solution, filter to obtain tungsten-removed slag and tungsten-removed liquid, The composition of tungsten removal slag is WO 3 8.6%, Mo 10.3%, tungsten removal slag stockpile, concentrated recovery of tungsten and molybdenum, the composition of the liquid after tungsten removal: Mo 84.7g / L, P 0.001g / L, As 0.001g / L, SiO 2 0.01g / L, WO 3 0.05g / L, after removing tungsten, add nitric a...

Embodiment 3

[0025] The leaching solution obtained by pressure cooking high molybdenum tungsten concentrate with sodium carbonate contains: WO 3 123g / L, Mo15g / L, pH value 8.2, add magnesium nitrate according to 1.8 times the stoichiometric number of magnesium salt precipitation, stir at 85°C for 1.5 hours, filter to remove P, As and Si, and then press the filtrate to form artificial scheelite Add calcium carbonate at 2.5 times the stoichiometric number of the mineral, stir at 80°C for 3 hours to precipitate tungsten in the solution, filter to obtain artificial scheelite and aluminum-containing filtrate, artificial scheelite is 3 times the stoichiometric number of its decomposition Add hydrochloric acid, stir at 70°C for 2.0 hours, filter and wash to obtain artificial white tungstic acid, artificial white tungstic acid is dissolved in ammonia and crystallized by APT to obtain qualified ammonium tungstate. High-quality ammonium molybdate was obtained by liquid nitric acid precipitation and c...

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Abstract

The invention provides a method for separating and extracting tungsten-molybdenum from mixed solution of tungstate-molybdate. The method is characterized by: adding aluminum salt or magnesium salt for purification and impurity removal, adding calcium carbonate to precipitate tungsten selectively to obtain artificial scheelite, making the liquid obtained after tungsten precipitation subjected to absorption by ion exchange resin or extraction by a solvent extraction agent to obtain ammonium molybdate, adding acid into the artificial scheelite for decomposition to obtain artificial tungstic acid, and performing ammonia dissolution and crystallization of the artificial tungstic acid to obtain ammonium tungstate. Therefore, effective separation and recovery of tungsten and molybdenum are realized; and in addition, the method has the advantages of short flow, high process adaptability, low consumption of reagents, low processing cost, high recovery rate of metal, good operating environment, and the like.

Description

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Claims

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Application Information

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Owner CENT SOUTH UNIV
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