Saint Petersburg State Institute of Technology, Saint Petersburg, Russia:

A. A. Blokhin, Professor, Head of a Chair “Technology of rare elements and nanomaterials on their basis”, e-mail: blokhin@list.ru

Yu. V. Murashkin, Assistant Professor, e-mail: murashkin-1@mail.ru

LLC “Scientific-Research Center “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

There was made a comparison of efficiency of application of anionites Lewatit MP62 and AM-2b (АМ-2б) and ampholyte VP-14K (ВП-14К) for conversion of sodium tungstate into ammonium tungstate. Tungsten capacity of anionite Lewatit MP62 is closed to ampholite VP-14K and is by ~1.5 times higher than the one of anionite AM-2b. Tungsten desorption from anionites Lewatit MP62 and AM-2b by ammonia solution at the room temperature is not complete. Increasing of temperature to 52–54 ^оС makes possible the significant improvement of results of tungsten desorption from both anionites: tungsten desorption completeness is considerably increased; eluent volumes, which should be passed through anionites, are decreased; and tungsten concentration in strippants is increased. Experiments with application of anionite Lewatit МР62 were carried out in dynamic conditions for the processing of sodium tungstate solution, obtained as a result of autoclave-soda leaching of tungsten from scheelite concentrate of one of concentration plants. Initial solution had the following composition, g/l: 62 of WO₃, 102 of Na₂CO₃; 0.23 of Si; 3.36 of organic substances (assessment was carried out by the indicator of chemical oxygen uptake). After hydrolytic purification from silicon, solution was oxidized to the pH = 3.3, separated from the isolated organic substances and directed to the sorption into the column, fulled with anionite. Tungsten desorption was carried out by 14% solution of NH₄OH at the temperature of 54 ^оС. During the sorption of tungsten from the industrial solution, tungsten capacity of anionite МР62 is not less high than during the sorption from model solutions (>300 mg of WO³/ml of anionite). Besides, there is confirmed the complete desorption of tungsten with hot ammonia solutions from anionite MP62. Concentration of WO₃ in marketable desorbate was 78 g/l.

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