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Given that bromine and sodium bromide appear to be responsible for the high operating cost, and the bromine price has been increasing from $0.75/kg in 2002 to approximately $4.8/kg in 2017 (USGS, 2002, 2017), it is beneficial to investigate the effect of the bromine price on the economic feasibility. As shown in Table 8.7, the operating cost is still higher than the revenue regarding a bromine price of $0.75/kg. The sensitivity analysis also investigated the effect of market prices for the metals of interest. From Table 8.7 we can see that increasing metal market prices by 20% does raise the revenue; however, the revenue is still lower than the operating cost, which still results in a non-economically feasible recycling plant. Table 8.6 Estimated revenue Metal Gold Silver Palladium copper Tin Lead Zinc Nickel Market price per unit (USD) Unit Average composition (%) 0.0145 0.0437 0.002 24.13 3.8 1.13 3.29 0.52 Daily revenue ($) 57,521 2278 5,853 16,533 7356 221 913 545 91,200 328,000 Metal market price 41.5 g 0.54 g 32.5 g 7 kg 20 kg 2 kg 3 kg 11 kg Daily revenue (rounded) ($) Daily Operating cost (rounded) ($) Table 8.7 Sensitivity analysis Bromine price 2017 ($4800/tonne) Operating cost 328,000 Revenue 91,200 2002 ($750/tonne) 222,000 91,200 20% 328,000 110,000 -20% 328,000 73,000 111PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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