Method for deeply removing molybdenum from tungstate solution through ion exchange process

An ion exchange method and tungstate technology, which is applied in the field of deep molybdenum removal from tungstate solution by ion exchange method, can solve the problems of short service life, complicated process and high cost of resin, and achieve extended service life, simple operation, short process effect

Active Publication Date: 2015-03-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the molybdenum removal process from the molybdenum-containing tungstate solution in the prior art, the removal of molybdenum is not complete, the cost is high, and the process is relatively complicated, especially in the process of removing molybdenum from the tungstate solution by the existing ion exchange method, the negative molybdenum resin The defects such as difficult desorption, short service life of the resin, the object of the present invention is to provide a kind of method that adopts polyamine-based weakly basic anion resin to selectively remove molybdenum from tungstate solution, the method has good molybdenum removal effect and easy desorption, The desorption process does not need to add an oxidant, which greatly prolongs the service life of the resin, and the method is short in flow, simple in operation, low in cost, and easy to realize industrial application

Method used

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  • Method for deeply removing molybdenum from tungstate solution through ion exchange process

Examples

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Effect test

Embodiment 1

[0022] Thioated molybdenum-containing sodium tungstate solution containing WO 3 249.65g / L, containing Mo 3.98g / L, flowing through the ion exchange column filled with polyamine-based weakly basic anion resin, when the processing capacity of the feed liquid is 12 times the volume of the resin bed, the Mo content in the effluent is 0.0069 g / L, Mo / WO 3 The mass ratio is 2.76×10 -5 ; Negative molybdenum resin is desorbed with 0.5mol / L NaOH solution. When the amount of desorbent is 6 times of the resin bed volume, the molybdenum desorption rate reaches over 99%.

Embodiment 2

[0024] The desorbed resin in Example 1 is directly used for another batch of molybdenum-containing sodium tungstate solution ion exchange through thiolation to remove molybdenum, and the solution contains WO 3 210.52g / L, containing Mo 14.92g / L, when the feed liquid treatment capacity is 6 times the volume of the resin bed, the effluent contains Mo 0.0091g / L, Mo / WO 3 The mass ratio is 4.32×10 -5 ; Negative molybdenum resin is desorbed with 0.5mol / L NaOH solution. When the amount of desorbent is 6 times the volume of the resin bed, molybdenum desorption is complete.

Embodiment 3

[0026] Thioated molybdenum-containing ammonium tungstate solution containing WO 3 192.46g / L, containing 5.21g / L molybdenum, flowing through the ion exchange column filled with polyamine-based weakly basic anion resin, when the processing capacity of the feed liquid is 10 times the volume of the resin bed, the effluent contains Mo 0.006 g / L, Mo / WO 3 The mass ratio is 3.12×10 -5 ; Negative molybdenum resin is desorbed with 0.5mol / L NaOH solution. When the amount of desorbent is 6 times of the resin bed volume, the molybdenum desorption rate reaches over 99%.

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Abstract

The invention discloses a method for deeply removing molybdenum from a tungstate solution through an ion exchange process. According to the method, multi-amine weak basic anion exchange resin is employed for selectively adsorbing and removing thiomolybdate anion from the tungstate solution subjected to sulfur substitution. The method is good in molybdenum removal effect and easy for desorption, the desorption process does not need adding an oxidant, and the service life of resin is substantially prolonged. Also the method is short in flow, simple in operation and low in cost, and is easy for industrialized application.

Description

technical field [0001] The invention relates to a method for deeply removing molybdenum from a tungstate solution by an ion exchange method, and belongs to the field of hydrometallurgy. Background technique [0002] Tungsten and molybdenum are similar elements, and their physical and chemical properties are very similar. Molybdenum is associated with tungsten minerals, but the content is different. With the depletion of high-grade tungsten ore resources, low-grade tungsten ore resources and tungsten secondary resources have become more and more important raw materials for tungsten metallurgy, and the concentration of molybdenum ions in tungstate solutions produced from these raw materials is also increasing. higher. In order to prepare pure tungsten compounds, efficient and thorough separation of molybdenum from tungstate solution is an essential link. The current industrial processes for removing molybdenum from tungstate solutions are based on the fact that molybdenum c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
CPCC01G41/00
Inventor 肖连生曹佐英张贵清李青刚曾理关文娟
Owner CENT SOUTH UNIV
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