How does the concentration of sulfuric acid and ferric sulfate affect the leaching efficiency of silver and copper?

Label:chem

Topic
The study employs Response Surface Methodology (RSM) with a Central Composite Design (CCD) to evaluate the effects of sulfuric acid and ferric sulfate concentrations on the leaching efficiency of silver and copper from photovoltaic waste.
Answer
The leaching efficiency of silver and copper is significantly influenced by the concentrations of sulfuric acid and ferric sulfate. For silver, both sulfuric acid and ferric sulfate concentrations, along with their quadratic terms, significantly affect leaching efficiency. The optimal conditions for silver recovery are around 0.2M sulfuric acid and 0.15M ferric sulfate. For copper, ferric sulfate concentration is the primary factor influencing leaching efficiency, with sulfuric acid having a negligible effect. The model predicts that increasing ferric sulfate concentration enhances copper recovery.
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