Tungsten Hydrometallurgy Ion Exchange New Technology Research

Aiming at problems of the traditional ion exchange technology in tungsten hydrometallurgy,including low concentration of the feed solution,high water consumption and waste water discharge and so on,a novel ion exchange technology is advanced,which strong alkali anion-exchange resin in HCO₃^- form is applied as adsorption agent and mixing ammonium solution including NH₄HCO₃ and(NH₄)₂CO₃ as desorption agent.The influence of concentration of WO₃ and NaOH in feed,contact time of adsorption on adsorption of WO₃,the influence of composition of desorption agent,contact time on WO₃ desorption,and the behavior of impurities phosphor and arsenic in adsorption and desorption is explored in the single-column with simulated feed at first,and then test in serial column is conducted,at last the industrial feed is used to confirm the result of experiment.The result shows that,the novel ion exchange technology can separate phosphor and arsenic from WO₃ while convert Na-2WO₄ to (NH₄)₂WO₄,the novel ion exchange technology is feasible in technique. The WO₃ concentration of the feed solution in the novel ion exchange technology can be up to 80～100 g/L,is higher than the one in the traditional ion exchange technology notable,the effluent of adsorption can be returned for leaching after proper treatment.The novel ion exchange technology can strengthen the production,reduce the water consumption and waste water discharge,recover the alkali in leaching liquor of tungsten ores,and is an clean production technology for tungsten hydrometallurgy.