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HomeMiningMetallurgy & Process DesignCyanidation TechnologiesCyanide DestructionSO2 (Sulfur Dioxide) Air
SGS offers a number of cyanide destruction processes. The SO2 air process is relatively simple and invariably cost-effective. During the process, sulfite ions react with atmospheric oxygen and a copper catalyst as follows:
2CN- + Na2S2O5 + 2O2 + 2OH- --> 2CNO- + Na2SO4 + SO42- + H2O
The SO2 process offers a number of advantages over other cyanide destruction methods including:
SGS can review your flowsheet at both the batch and pilot scale and assess if the SO2 air process is appropriate for your project or mine. The batch test allows our metallurgists to carefully monitor the CNWAD concentrations and establish the target conditions (catalyst, oxygen, redox potential) for continuous pilot testing. Data from these is used to design a flowsheet and set parameters resulting in compliant cyanide concentrations in your tailings at the lowest possible cost. Our pilot testing will demonstrate this for all stakeholders.
SGS has the robust technology and technical expertise to provide you with bankable and effective cyanide management at every stage of your gold recovery operation. Contact us early in the planning stages of your project to learn if the SO2 air process is the best solution for destroying the cyanide used in your operations.