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Tham khảo tài liệu 'extractive metallurgy of copper part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Costs of Copper Production 397 23.7 Production of Copper from Scrap Chapter 20 showed that copper scrap varies in grade from 99.5 Cu manufacturing wastes to 5 Cu recycled mixed-metal scrap . The high-grade manufacturing wastes require only reclamation melting casting and marketing which costs of the order of SO.lO kg of copper. Low-grade scrap on the other hand requires reclamation sorting smelting refining and marketing which costs about 0.5 per kg of copper Table 23.2. Intermediate grade scrap treatment lies between these two extremes. For scrap recovery to be profitable the difference between refined copper sales price and scrap purchase price must exceed these treatment charges. If it doesn t scrap is held off the market. 23.8 Lcach Solvent Extraction Elcctrowinning Costs The investment and operating costs of heap leach solvent extraction electro-winning plants are listed in Tables 23.12 and 23.13. The costs are shown to be considerably lower than those for conventional concentration smelting refining complexes. This accounts for the rapid adoption of leaching in the 1990 s especially in Chile. Table 23.12. Heap leach solvent extraction electrowinning investment costs. Fixed investment costs for a heap leach solvenl extraction electrowinning plant. The plant produces copper cathode plates ready for shipment from 0.75 Cu oxide ore. Stainless steel cathodes and polymer concrete cells are used. Mine investment cost is not included. Component su.s. per annual tonne of copper Heap leach system including leach pad crusher agglomerating drum on-off heap building and removal equipment piping pumps solution collection ponds etc. 1600 Solvent extraction plant including mixer-settlers pumps piping storage tanks and initial extractant and diluent 400 Electrowinning plant including electrical equipment polymer concrete cells rolled Pb-Sn-Ca anodes stainless steel cathodes cranes cathode stripping washing and handling equipment 700 Utilities and infrastructure 500 .
