Saint Petersburg State Technological Institute, Saint Petersburg, Russia:

A. A. Blokhin, Professor, Head of a Chair of Technology of Rare Elements and Nanomaterials on their basis, e-mail: blokhin@list.ru

LLC “Scientific-Research Centre “Gidrometallurgiya”, Saint Petersburg, Russia:
M. A. Pleshkov, Leading Researcher, e-mail: pleshkov@gidrometall.ru
Ya. M. Shneerson, Chief Executive Officer, e-mail: src@gidrometall.ru

Representative Office of Purolite Ltd. in Russia, Moscow, Russia:
M. A. Mikhaylenko, Hydrometallurgy director, e-mail: purolite_mm@co.ru

There was carried out the assessment of the results, reached using strongly basic anionites for sodium tungstate conversion into ammonium tungstate during the processing autoclave-soda decomposition solutions of standard sheelite concentrates. Sampling the gel anionites АМ, Amberjet 4400, Purolite SGA 600, Purolite PFA600 and macroporous anionite Purolite А500U for tungsten sorption directly from carbonate solutions defined the largest tungsten capacity of gel anionites Purolite PFA600 and Amberjet 4400. Anionites transition from chloride into hydrocarbonate or carbonate forms allows significant increase of their tungsten capacity to the skip and complete dynamic exchange capacity. Anionites transition from hydrocarbonate into carbonate form has almost no influence on their capacity characteristics. There were obtained the data about tungsten desorption from anionites by the mixture of solutions NH₄HCO₃ and (NH₄)₂CO₃ and ammonia solutions NH₄Cl. Application of both methods leads to the similar results. There were carried out the experiments of tungsten sorption from real solutions of autoclave-soda decomposition of sheelite concentrate, containing the impurities of silicon, arsenic, phosphorous, molybdenum and organic substances, together with target component. During the sorption from real solutions, complete dynamic exchange tungsten capacity of anionite Purolite PFA600 and anionite Amberjet 4400 reach 145 mg WO₃/ml of ionite and 136 mg WO₃/ml of ionite, respectively. Anionite transfer from hydrocarbonate form into carbonate, as well as NaOH addition to the sorption-fed solution leads to reduction of silicon sorption, and to decreasing its concentration in strippants.

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