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External burner to up temperature? - no, rather defeats the...

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    External burner to up temperature? - no, rather defeats the purpose of recovering heat from other processes and anyway would likely be less cost effective than running the diesels for longer.
    Step-down of process heat? - best bet - burn diesel/gas at 1000C to make steam to heat ore/carbon/cyanide slurry to increase gold extraction rates and/or dry out the gold loaded carbon at the end of the process - good idea to cream off the temperature from combustion at 1000C and steam at 240C and use the energy difference to make electricity - good Carnot efficiency. Works for ALCOA.
 
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