Optimization of atmospheric leaching parameters for cadmium and zinc recovery from low-grade waste by response surface methodology (RSM).

With the increase of S/L, the recovery efficiency of Cadmium and Zinc increases due to the increase in the number of contacts, but firstly by increasing in particle size, pH and oxygen injection, the Cadmium recovery increases and then decreases, while the increase in particle size and pH for Zinc recovery has a decreasing trend because the movement of larger particles is reduced and mass transfer is also reduced.

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