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| free sulphuric acid (A method of leaching zinc from a zinc concentrate by grinding the zinc concentrate in an aqueous solution containing free sulfuric acid and ferric ions. Dominator_Salvator) | |||
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| free sulphuric acid (A method of leaching zinc from a zinc concentrate by grinding the zinc concentrate in an aqueous solution containing free sulfuric acid and ferric ions. Dominator_Salvator) | |||