Тип публикации: статья из журнала
Год издания: 2011
Идентификатор DOI: 10.1016/j.hydromet.2010.11.009
Ключевые слова: Platinum, Rhodium, Sorption, Anion exchangers, Chloride solutions, Ammonium thiocyanate, Basic parameters, Chemical structure, Diffusion Coefficients, Distribution coefficient, Exchange capacities, Kinetic properties, Noble metals, Purolite, Rhodium chloride, Separation factors, Sorption ability, Work Focus, Ammonium compounds, Chlorine compounds, Desorption, Hydrochloric acid, Ion exchange, Ion exchange resins, Ions, Platinum compounds, Potassium hydroxide, Precious metals, Recovery, Sulfuric acid, Thioureas, Urea, Rhodium compounds
Аннотация: This work focuses on the sorption recovery of platinum (II, IV) and rhodium (III) simultaneously present in chloride solutions, freshly prepared and stored over 3 months, on commercial anion exchangers with different physical and chemical structure. The sorption was carried out from solutions with 0.001-4.0 mol/L HCl. The initial platinum and rhodium concentrations in contacting solutions were 0.25-2.5 mmol/L Sorption and kinetic properties of the chosen anion exchangers were investigated and the basic parameters of exchange capacity, recovery, distribution coefficients, separation factors, process rate, diffusion coefficients and half-exchange times were calculated. It is shown that anion exchangers investigated possess high sorption ability to platinum and rhodium chloride complexes, which does not deteriorate in case of stored solutions. Desorption of platinum and rhodium from the resins investigated was carried out with hydrochloric acid (2 mol/L), thiourea (1 mol/L) in sulfuric acid (2 mol/L) or in potassium hydroxide (2 mol/L) as well as by ammonium thiocyanate (2 mol/L). It was shown that complete separation of platinum and rhodium can be carried out with 2 mol/L HCl on anion exchanger Purolite S 985, whereas 2 mol/L NH(4)SCN as an elution agent leads to complete separation of noble metals on anion exchangers Purolite S 985, Purolite A 500 and AM-2B. (C) 2010 Elsevier B.V. All rights reserved.
Выпуск журнала: Vol. 105, Is. 3-4
Номера страниц: 341-349
ISSN журнала: 0304386X
Место издания: AMSTERDAM
Издатель: ELSEVIER SCIENCE BV
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