RIVS Group, Saint-Petersburg, Russia

A. Ya. Boduen, Director of the Hydrometallurgical Department, Candidate of Engineering, Sciences, a_boduen@rivs.ru

Saint-Petersburg Mining University, Saint-Petersburg, Russia
S. B. Fokina, Associate Professor, Candidate of Engineering Sciences
A. T. Fedorov, Assistant, Candidate of Engineering Sciences
G. V. Petrov, Professor, Doctor of Engineering Sciences

The results of the studies into adsorption process of platinum group metals (PGM) from hydrochloric acid solutions during processing of low-sulfide flotation concentrates using the pressure oxidative leaching (POL)—hydrochlorination technology are presented. The sorption isotherms of platinum and trivalent rhodium from hydrochloric acid individual and joint solutions on AH-31, Rossion-70 and Purolite S985 ions were constructed; the kinetic regularities were analyzed using the mathematical models of Boyd, Schmuckler, Lagergren and Ho–Mackey. It is proved that adsorption extraction of platinum and partially rhodium at all ion exchangers is most reliably described by a pseudo-first-order Lagergren model, i.e. in the first minutes the process is limited by film diffusion. It is experimentally found that the use of Purolite S985 ion exchange resin is accompanied by high recovery of platinum and rhodium from both their individual and collective solutions (at 96 %), which significantly exceeds the performance of ion-exchange resin Rossion-70. The use of the POL–hydrochlorination–PGM sorption technology to process flotation concentrates with subsequent ammonia desorption and additional acidic washing of the ionite with hydrochloric acid provides a collective platinum metal concentrate that meets the requirements of refining production.

The study was carried out using laboratory resources of the Sharing Center at the Saint-Petersburg Mining University. The authors express their gratitude and appreciation to the specialists within the RIVS Group and to the members of the Metallurgy Department at the Saint-Petersburg Mining University for the care, help and encouragement rendered during preparation of the article.

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