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AN INVESTIGATION ON THE IMPROVEMENT OF ZINC EXTRACTION FROM SILICEOUS CONCENTRATES

H. Atashy J. Rahnama-Rad M. Fallahnejad
Department of Chemical Faculty of basic sciences, Faculty of engineering
Engineering, Faculty of Engineering, Islamic Azad University, Zahedan sciences, Sistan & Baluchestan
University of Sistan and Baluchestan, Zahedan .Iran Branch, Zahedan, I.R. Iran University, Zahedan, I.R. Iran [email protected]

Abstract: Inhibiting of gel forming, under certain pH and temperature conditions, is one of the most effective ways in leaching process of siliceous zinc concentrates. In order to provide the crucial conditions for extracting zinc from siliceous zinc concentrates, the variables, e.g. temperature, pH, time duration, rotation speed of mixer and the remaining time which are known to affect the leaching process efficiency have been optimized. Experimental results indicate that the decreasing pH to close one, keeping solution temperature near boiling-point, mixing speed close to 200 rpm and the time duration of each period to be 180 minutes, optimizes the efficiency. Furthermore, to inhibit gel forming and super saturation which decreases efficiency, extraction time should be decreased. Due to gradual pH increase in the second stage of the experiments, impurities will not be dissolved and hence their omission will be more effective.

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