| 摘要 |
A method for removing low concentrations of soluble copper in the form of cupric cation and cuprocyanide and cupricyanide anions comprises first adding ferric cation, or ferrous cation and a soluble oxidizing agent, in an amount in excess of the stoichiometric amount required to form the ferric salts of the cuprocyanide and cupricyanide anions, and after a predetermined time adding an environmentally acceptable soluble precipitant to precipitate substantially all of the remaining excess ferric cation. By this procedure, very small concentrations of soluble cupric cation and the ferric salts of the cuprocyanide and cupricyanide anions, which are typically present in such low concentrations that they remain essentially permanently suspended in colloidal solution, are removed by the insoluble ferric compound which is present in much higher concentrations. |
