Ion Exchange Method Removing Molybdenum from Ammonium Paratungstate

Tungsten and molybdenum are similar elements, with very similar properties in physical and chemical. Generally, molybdenum will exist with tungsten in the ore, but different precision ore with different molybdenum content. For getting production process, completely and effectively separating tungsten and molybdenum is a necessary link in the production process ammonium paratungstate. In traditional tungsten smelting process, there are many problems in the removing molybdenum step, for example: impurities removed not completely, huge cost, complex process and resin difficult to desorption. Therefore, studies on deeply removing molybdenum with the process ensured simple, and control costs are becoming especially meaningful. According to the problems enumerated above, using a multi-amine weakly basic anion exchange resin in the production process of ammonium paratungstate by ion-exchange method for deeply removing molybdenum is proposed in this paper.



In this method, multiple amine weakly basic anion exchange resin is used as the stationary phase, and ammonium tungstate solution containing with thiomolybdate anion as the mobile phase, carrying out anion exchange adsorption to make the thiomolybdate anion selectively adopted by multi-amine weakly basic anion exchange resin, thus to achieve the goal of  separating tungsten and molybdenum effectively, and to obtain the high purity ammonium tungstate solution; then, further evaporation, concentration and crystallization to generate high purity APT crystals.
Noted: Multi-amine weakly basic anion resin can be desorption with low concentrations of sodium hydroxide solution (0.5mol / L), thus going to be reused.

The method that selectively removing molybdenum from tungstate solution by multi-amine weakly basic anion exchange resin has the advantages such as: effectively removal ; the resin can be reused to extend its service life; a short process, simple to operation, low cost, easy to applied in industrial.

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