Saint Petersburg State Technological Institute, Saint Petersburg, Russia:

E. E. Maltseva, Post-Graduate Student
A. A. Blokhin, Professor, Head of a Chair of Technology of Rare Elements and Rare-Element-based Nanomaterials, e-mail: blokhin@list.ru

Yu. V. Murashkin, Assistant Professor

“Scientific-Research Center “Gidrometallurgiya” LLC, Saint Petersburg, Russia:

M. A. Pleshkov, Leading Researcher

Representative Office of Purolite company in CIS, Moscow, Russia:

M. A. Mikhaylenko, Representative on Scientific-Technical Problems

There was researched the possibility of extraction of rhenium from molybdenum-containing solutions after autoclave decomposition of molybdenite concentrates by oxygen in presence of nitric acid, using weak base anion resins Purolite A170 and A172. There was found that rhenium is adsorbed by these resins completely, and rhenium distribution coefficients on them are decreased slightly with increasing of concentration of sulfuric acid. Significant amounts of molybdenum are sorbed by A170 macroporous resin with rhenium, in contrast to A172 gel resin. However, when sulfuric acid concentration is increased from 0.2 to 2 mol/l, molybdenum distribution coefficient on A170 resin is reduced by more than an order of magnitude. When concentration of nitric acid in the solutions is increased, the rhenium capacity of both anion exchange resins is decreased. Rhenium stripping by ammonia solutions from A172 resin is not complete, which leads to reduction of its rhenium sorption value in next sorption-stripping cycles. At the same time, ammonia solutions readily strip rhenium from A170 resin. Usage of A170 macroporous resin as sorbent was offered on the first stage of sorption extraction of rhenium directly from solutions, obtaining as a result of decomposition of molybdenite concentrates. Both A170 macroporous and A172 gel resins are applicable for the second concentration of rhenium from primary desorbates.

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