Cadmium Ions Recovery by Chemical Precipitation Method from Rezidual Solutions of Galvanic Plating
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چکیده
This study deals with the removal of cadmium (II) from cadmium plating wast water by chemical precipitation in shape of white crystalline precipitate, using oxalic acid o,5M as chemical reagent.It was studied the influence of pH, dose of reagent, temperature and also the influenceof initial concentration of cadmium cation.The efficiency of process was expressed in percentage for all the experiments.The removal of cadmium (II) from wastewater stream and discharged was made to optimum pH, optimum dose of precipitation agent, temperature 6070 0 C, for an initial concentration of 0,0088 M Cd/L.The extraction degree attained 80% proffitability (removal of cadmium ion). The quantity of cadmium unextractable like cadmium oxalate shape was removed by precipitation with limes tone 10%. The final effluent is corresponding to SR ISO 8288, as regarde the content of allowed cadmium ion. The optimizated conditions and entired process cadmium recovery are presented in a technologoical flux.
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