Extraction of Thiocyanate Complexes of Metals in the Systems Based on Potassium Bis(alkylpolyoxyethylene) Phosphate and Alkylbenzyldimethylammonium Chloride
S. A. DENISOVA1, YU. I. ISAEVA1, A. M. ELOKHOV1, A. E. LESNOV2,3
1Perm State University, Perm, Russia
2Perm State Agro-Technological University, Perm, Russia
3Institute of Technical Chemistry, Ural Branch of the Russian Academy of Sciences, Perm, Russia
Keywords: жидкостная экстракция, ионные ПАВ, анионообменная экстракция, тиоцианатные комплексы металлов, liquid extraction, ionic surfactants, anion-exchange extraction, thiocyanate complexes of metals
Pages: 318-322
Abstract
The article summarizes the results obtained in the studies of the distribution of thiocyanate acid complexes of iron (III), copper (II), cobalt (II), zinc and cadmium in extraction systems based on technical surfactants - potassium bis(alkylpolyoxyethylene) phosphate (oxyphos B) in the presence of sulphuric acid, alkylbenzyldimethylammonium chloride (catamin AB) in the presence of nitric acid at room temperature or their mixture at 50 ºC. It was established that the efficiency of individual surfactants as extractants is conserved both with inorganic salts and acids used as salting-out agents. It is shown that for oxyphos B extractability decreases as a sequence Fe(III) > Co(II) > Zn > Cu(II) > Cd, while for catamine AB the sequence is Cd ≈ Zn > Co(II) > Cu(II) > Fe(III), and in the case when a mixture of surfactants is used, oxyphos B is determining, which is confirmed by the extractability sequence: Fe(III) > Co(II) > Zn > Cu(II) > Cd. Oxyphos B is an analog of neutral oxygen-containing extractants, it concentrates thiocyanate acid complexes according to the hydrate-solvate mechanism, while catamin AB, anion-exchanging extractant. is more efficient in the extraction of thiocyanate complexes. The use of a mixture of the indicated surfactants allows one to carry out the process in more diluted solutions and to obtain synergetic effects in extraction.
DOI: 10.15372/CSD2019145
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