Aqueous Oxidation of Zinc Sulfide in Hydrochloric Acid

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  • Arai Kôichi
    Department of Metallurgy, Faculty of Engineering, Toyama University

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The aqueous oxidation of zinc sulfide in diluted hydrochloric acid was carried out in order to obtain fundamental data on acidic leaching conditions.<BR>Deaerated hydrochloric acid of pH 1∼3 and of 10−1∼1 mol/L Cl− was used as acidic media. The amount of zinc sulfide powder suspended in the acidic solution was 10−2∼10−1 mol/L . The solution was set under certain temperatures between 25°∼60°C and stirred at 600 rpm.<BR>Results obtained from the experiment were as follows:<BR>(1) The main dissolution reaction of zinc sulfide in acidic media was of the type of hydrogen sulfide formation and showed a parabolic behavior. The reaction was of diffusion control.<BR>(2) The influence of pH to the dissolution rate of zinc sulfide was linear and the rate of dissolution was decreased with increasing value of pH.<BR>(3) The presence of chloride ion positively influenced the dissolution of zinc sulfide, especially at high temperature.<BR>(4) The relation between the dissolution rate of zinc sulfide and the unit surface area of the ore powder suspended was almost linear. The rate was proportionally increased with increasing area of ore powder.<BR>(5) The dissolution rate of zinc sulfide was large at the initial stage and then decreased with the lapse of time. The rate of dissolution of zinc sulfide was probably decreased with the coexistence of Zn2+ in the solution.

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