·been developed to leach copper from chalcopyrite concentrates These pro cesses recover copper via hydrometal lurgical leaching of the copper compo nent of chalcopyrite concentrates fol lowed by solvent extraction and electro winning A number of demonstration plant operations have been conducted but as of this writing none of the processes
·The Sepon copper plant has started up successfully in March of 2005 The initial plant capacity is set for 60 000 tpa of copper The autoclave oxidation of pyrite/sulfur will provide virtually all acid and ferric sulfate and heat required for the copper leaching process
·The copper cement can be removed at the end of each cycle or after several cycles of operation ACID SUPPLY The source of sulphuric acid for leaching is usually a major consideration for small plants If the plant is located in an area where acid can be purchased at low cost one of the greater items of capital expense can be avoided
·Gold and silver can be recovered by adding a lime boil step before cyanide leaching The Copper Pressure Oxidation Plant is an Outotec proprietary technology for impure concentrate refining The new process offers an effective way to dissolve concentrate remove impurities and recover copper as LME A grade cathodes In addition the flowsheet
·Copper Leaching Practices For centuries small amounts of copper have been recovered from acid mine drainage waters In recent years the expansion of copper bearing waste dump leaching for copper recovery has established a technological basis that is rapidly converting the art of copper leaching into a science
CLC uses a process known as Clean Technology thanks to which the copper produced is ready for sale directly from the plant The final product is % pure copper classed as Grade A The reactors or leaching tanks an essential part of processing the ore have been developed for CLC by the Finnish company Outotec This
·plant size and carbon inventory and thus the cost of the adsorption circuit SART for copper control in cyanide heap leaching by M Stewart and D Kappes Synopsis Copper cyanide is a common component of cyanide treatable precious metal ores The copper concentration in production heaps can be
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