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The cyanide removal step is not employed to produce an effluent of suitable quality to meet the imposed effluent discharge limits but rather relies on fur- ther removal of cyanide by natural degradation in the tailings ponds. The regulated parameters in the effluent from the tailings pond are usually below the objective limits of this process.Recently, brand name products such as DTOX have been introduced, based on the sulphide precipitation process principles (Min- eral Process Control, 2013). The reaction between cyanide and polysulfide–sulfur contained in DTOX converts hydrogen cyanide to thiocyanate. In addition, heavy metal ions can be precipitated as cyanide, and free and complex cyanides are neutralised. The end products released to the environment contain carbonates and ammonia. It is claimed that the reaction is safer and the rates are more rapid than those of hypochlorite. The experiments conducted to investigate the reaction in a 2% (20,000 mg/L) solutionof sodium cyanide revealed that the reaction was 95% complete
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