| 摘要 |
<p>nonferrous metallurgy; applicable in electrochemical recovery of noble metals. SUBSTANCE: method includes neutralization of aqueous solution after extraction processing of noble metals, for instance, raffinate after extraction of platinum and palladium up to residual acidity of 20-30 g/l of HCl. Solution is treated in electrolyzer on flat titanium cathode with current density of 1500-2000 A/sq.m and voltage of 8-12 V. Formed in process of electroflotocoagulation occurring in electrolyzer are hydroxides of base metals on which organic substance found in solution are adsorbed. Organic substances include extracting agents and solvents, for instance, tributyl phosphate, kerosene, octanol, etc. Purified solution contains traces of inorganic impurities and organic matter. For this solution, noble metals are deposited on three-dimensional cathode made of graphite material. EFFECT: higher efficiency due to processing of solutions obtained in extraction processing of noble metals, increased recovery and purity of final product. 3 cl, 1 tbl, 3 ex</p> |
