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Hi everyone. I wonder how is oxidizing gas (O2/air) flow rate is calculated for the atmospheric cyanide leach.
I have experience with pressure oxidation of sulfides. The calculation method is very straightforward. First – calculate stoichiometric consumption for reactions. Second – consider for the O2 utilization (usually 80-90%) and distribute gas in accordance with kinetics in compartments.
With cyanide leach, however, it is different. Stoichiometric consumption is extremely low (Elsner equation). As well as O2 utilization. But we know that we must blow enough air/oxygen to provide high dissolved oxygen content (8-10 ppm? sometimes higher with special aeration devices). Is that the main design criterion?
If so, how to calculate what is the air flow rate to provide that DO content?
And what is the standard industrial practice: how much air is fed to the CIP/CIL tanks? In Nm3 per ton of solid or Nm3 per 1000m3 of slurry… Any indication will help.
Thanks.