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8.2.3 Operating Costs The main operating costs involve reagents, electricity, labor and waste treatment. Reagent usage for the leaching circuit is reflective of experimental results during this project. Based on the colorimeter measurement, approximately 1.15g of free bromine can be recycled after a 10-hour leaching under the optimal leaching condition. By assuming that the effective recycling rate for bromine is 90%, when 1 tonne bromine is used in the leaching circuit, approximately 0.043 tonnes of bromine could be recycled. Regarding the circuit for metal purification and recovery, reagent usage was estimated by a cost model for a 7000 TPY copper SX-EW plant. The price per kilowatt hour was estimated from Costmine 2017 for an average energy cost in Arizona of $0.07/kWhr (Costmine, 2017). Operating costs for after-process treatments, including emission, wastewater treatment and hazardous disposal, were estimated to be 10% of the operating cost. Table 8.2 Major equipment costs Equipment shredder Mixers (closed tank) Pump (process) Pump (slurry) Mixers (closed tank) Tanks (settler) EW cell Sum (rounded) Specification 950kg/h 106.7 cm impeller diameter discharge size 2/9 ft discharge size 2/9 ft 91.4 cm impeller diameter 757 L 1.3 m X 1.37m X 4.6 m - No. Cost $/unit 1 25,000 2 45,000 1 10,500 1 11,000 6 37,000 6 460 36 113,024 - - Total cost, $ 25,000 90,000 10,500 11,000 222,000 2,760 4,068,864 4,627,000 Hammermill 4.9m X 3.0m boom with 152 kg-m impact energy hammer 1 62,900 62,900 Inclined screens,standard 1.2m X 2.4m triple deck 1 40,300 40,300 Filters, plate and frame pressure - 3 22,500 67,500 Gas fired solution heater 1,000,000btu/hr output 1 26,300 26,300 108PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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