Molybdenum removal method of ammonium tungstate feed liquid

A technology of ammonium tungstate and feed liquid, which is applied in the preparation of tungsten compounds, chemical instruments and methods, tungsten compounds, etc., can solve the problems of poor adsorption effect, low molybdenum saturated adsorption capacity, and inability to make full use of resin adsorption capacity, etc. Achieve stable adsorption effect, increase saturated adsorption capacity, and avoid poor absorption effect

Active Publication Date: 2019-08-09
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the defects that the saturated adsorption capacity of molybdenum in the resin adsorption ammonium tungstate solution is low in the prior art, the adsorption capacity of the resin cannot be fully utilized, and the adsorption effect is not good, thereby providing a molybdenum A molybdenum removal method for ammonium tungstate feed liquid with high saturated adsorption capacity and good adsorption effect

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  • Molybdenum removal method of ammonium tungstate feed liquid

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Embodiment 1

[0029] This embodiment provides a method for removing molybdenum from an ammonium tungstate feed solution, including:

[0030] In the vulcanization step, add ammonium sulfide as a vulcanizing agent to the ammonium tungstate feed solution, stir for 4 hours, after the stirring is completed, the molybdenum concentration is 1.15g / L, S 2- The ion concentration is 3.06g / L, stand for 72h, and use a precision filter to remove particles and suspended solids in the feed solution to make a sulfide feed solution.

[0031] In the cascade adsorption step, the vulcanized material liquid is adsorbed once by WDA918 resin. The mass of WDA918 resin is 467g, and the flow rate of the vulcanized material liquid is controlled to 15ml / min to obtain a post-adsorption liquid. Control the concentration of molybdenum in the liquid after the first adsorption to ≤0.1g / L, when it reaches 0.1g / L, it is once the adsorption is saturated and the adsorption stops. Then, the obtained primary adsorption liquid was sub...

Embodiment 2

[0034] This embodiment provides a method for removing molybdenum from an ammonium tungstate feed solution, including:

[0035] In the vulcanization step, add ammonium sulfide as a vulcanizing agent to the ammonium tungstate feed solution, and stir for 8 hours. After the stirring is completed, the molybdenum concentration is 1.15g / L, S 2- Ion concentration is 3.06g / L, stand for 36h, use a precision filter to remove particles and suspended matter in the material liquid to make a vulcanized material liquid;

[0036] In the stepped adsorption step, the simulated exchange column I (model φ5cm×70cm) was filled with 467g of WDA918 resin, and the simulated exchange column II (model φ5cm×70cm) was filled with 467g of 201×7 resin. Put the vulcanized material liquid into the simulated exchange column I, and perform a primary adsorption by WDA918 resin. The flow rate of the vulcanized material liquid is controlled to 20ml / min to obtain the primary adsorption liquid. After the primary adsorption...

Embodiment 3

[0041] This embodiment provides a method for removing molybdenum from an ammonium tungstate feed solution, including:

[0042] In the vulcanization step, add ammonium sulfide as a vulcanizing agent to the ammonium tungstate feed solution, stir for 6 hours, after the stirring is completed, the molybdenum concentration is 2.5g / L, S 2- The ion concentration is 4.56g / L, stand for 54h, and use a precision filter to remove particles and suspended solids in the material liquid to make a vulcanized material liquid;

[0043] In the stepped adsorption step, the simulated exchange column I (model φ5cm×70cm) was filled with 467g of WDA918 resin, and the simulated exchange column II (model φ5cm×70cm) was filled with 467g of 201×7 resin. Put the vulcanized material liquid into the simulated exchange column I, and perform a primary adsorption by WDA918 resin. The flow rate of the vulcanized material liquid is controlled to 25ml / min to obtain the primary adsorption liquid, and the concentration of ...

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Abstract

The invention provides a molybdenum removal method of ammonium tungstate feed liquid. The method comprises the steps of a sulfurizing step, wherein a sulfurizing agent is added in the ammonium tungstate feed liquid, and sulfurizing feed liquid is obtained; a stepped adsorption step, wherein the sulfurizing feed liquid is subjected to primary adsorption through WDA918 resin until achieving saturation, primary post-adsorption liquid is obtained and subjected to secondary adsorption through 201*7 resin until achieving saturation, and the molybdenum-removed ammonium tungstate feed liquid is obtained. Two kinds of resin are combined for use, the two kinds of the resin can achieve high adsorption capacity, and the good adsorption effect is achieved.

Description

Technical field [0001] The invention relates to the field of rare metal resource utilization, in particular to a method for removing molybdenum from an ammonium tungstate feed liquid. Background technique [0002] Affected by the shrinkage of the lanthanide series, the VIB elements of the fifth and sixth periods are similar in nature, and they often coexist and coexist in the same mineral, making separation difficult. Therefore, the separation of tungsten and molybdenum has always been a key and difficult issue in the tungsten smelting industry. At present, in the classic process of tungsten smelting in my country, the removal of molybdenum from ammonium tungstate solution uses a combination of selective precipitation and ion exchange. This method firstly presulfides the ammonium tungstate solution, and removes molybdenum from the ammonium tungstate solution. Mo and S 2- The thiomolybdate is formed, and then copper salt is added for co-precipitation and removal. The unprecipitate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
CPCC01G41/003
Inventor 黄万抚曾斌曾祥荣李新冬黄李金鸿胡运祯张天锡
Owner JIANGXI UNIV OF SCI & TECH
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