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HomeMiningMetallurgy & Process DesignCyanidation TechnologiesCyanide DestructionAlkaline Chlorination
SGS regularly develops cyanide destruction flowsheets and conducts the needed batch or pilot scale testing. Data from such tests is used to set technical parameters, and then design operating facilities that will result in compliant cyanide concentrations in your tailings at the lowest possible cost.
Alkaline chlorination yields a number of important advantages:
Limitations to alkaline chlorination include:
Alkaline chlorination is a relatively simple process in which cyanide leachate is treated in a nine-step procedure. During alkaline chlorination, cyanogen (CNCL) is formed and hydrolyzed to the cyanide (CNO) at an alkaline pH:
Reagents Cl2 + 2NaOH --> NaOCl + NaCl + H2O
Reactions NaOCl + CN-WAD --> CNO- + NaCl 4NaOCl + SCN- + 2OH- --> CNO- + SO42- + 4NaCl + H2O 3NaOCl + 2CNO- + 2H+ --> N2 + 2CO2 + 3NaCl +H2O 2Fe(CN)64- + NaOCl + 2H+ --> 2Fe(CN)63- + NaCl + H2O CNO- + H+ + H2O --> CO2 + NH3 NaOCl + CN- + 2H+ --> CNCl + Na+ + H2O CNCl + 2OH- --> CNO- + Cl- + H2O 6FeSO4 + 4Fe(CN)63- --> 2Fe3(Fe(CN)6)2 + 6SO42-
SGS has the technology and expertise to provide you with bankable and effective cyanide management at every stage of your gold recovery operation. Contact us early in the proposal and planning stage of your gold operation to learn if alkaline chlorination is the best solution for destroying the cyanide at your site.