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This process is more suitable for wastewaters rather than slurries, where H2O2 consumption might be significantly high. It was successfully used in the USA to neutralise cyanide remaining in the heap leach piles (USEPA, 1994). OK TEDI Mining Limited in Papua, New Guinea, employed H2O2 to meet extremely stringent government imposed effluent quality requirements in the 1980s. The gold mill operation throughput of 22,500 tonnes per day was a giant one by gold mill standards. The H2O2 solution was directly added to the carbon-in-pulp (CIP) tailings slurry and reacted in a mixed tank to oxidise cyanide to cyanate before discharge. This process is also known as the Degussa process because Degussa, who manufactures H2O2, developed an automated and closely controlled process in which H2O2 is efficiently used (Degussa, 1988). Although H2O2 can successfully oxidise and destroy cyanide, due to handling difficulties caused by its hazardous nature and economic reasons, it is not frequently used. Ammonia in the resulting effluent may pose toxicity to the fish.
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