Flotation separation and enrichment of rhodium by sodium nitrate-ammonium thiocyanate-cetylpyridinium bromide system
LI Yu-ling1,SI Xue-zhi2,MA Dong-dong1,MA Wan-shan*1
1.College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China; 2.College of Chemistry and Chemical Engineering,Henan University of Technology, Zhengzhou 450052, China
Abstract：The new flotation separation and enrichment method of rhodium by sodium nitrate-ammonium thiocyanate-cetylpyridinium bromide system (CPB) system was studied. The influence of acidity as well as the concentration of sodium nitrate, ammonium thiocyanate and CPB on the flotation rate of Rh3+ was investigated. The optimal conditions for the flotation separation of Rh3+ were obtained. Moreover, the flotation separation mechanism of Rh3+ was also discussed. The results showed that Rh3+ could react with ammonium thiocyanate and CPB under optimal conditions to form water insoluble ternary complex [CPB+]3[(Rh(SCN)63-], which was floated on the upper layer of salt-water phase and formed liquid-solid phase with clear interface. The acidity of solution was controlled at pH 2. When the concentration of sodium nitrate, ammonium thiocyanate and CPB was 0.2 g/mL, 8.0×10-3 mol/L and 3.0×10-3 mol/L, respectively, the quantitative separation of Rh3+ from Al3+, Mn2+, Ga3+, Fe2+, Cd2+, Mg2+, V, Ni2+ and Cr3+ was realized. The proposed method was applied to the flotation separation of trace Rh3+ in synthetic water samples. The recoveries were between 97.6% and 99.1%.
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