Comparison and Selection of Advanced Treatment Processes for Cyanide Containing Wastewater from Gold Hydrometallurgy
Four treatment processes,namely Na2SO3/air method,Na2S2O5/air method,H2O2 oxidation method,and NaClO oxidation method,were used for deep purification of cyanide containing wastewater from a gold smelting company's smelting plant.The optimal process parameters for the Na2SO3/air method treatment were determined through experiments as follows:reaction pH=9,reaction time 25 minutes,and Na2SO3 dosage 0.1 g/L;The optimal process parameters for the Na2S2O5/air method treatment are:reaction pH=10,reaction time 30 minutes,and Na2S2O5 dosage 0.1 g/L;H2O2 oxidation method treatment,with a dosage of 0.15 g/L H2O2 agent;The NaClO oxidation method is used for treatment,with a NaClO reagent dosage of 0.2 g/L.By comparing and analyzing the costs,advantages,and disadvantages of the four treatment processes mentioned above,the optimal treatment process was determined.The study provides technical support for the advanced treatment of cyanide containing wastewater.
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