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RECOVERY OF METALS FROM ACID MINE DRAINAGE BY SELECTIVE SEQUENTIAL PRECIPITATION PROCESSES
Abstract
The enhanced oxidation of su lphide minerals by mini ng activities is a worldwide problem of significant environmental interest because of leading to the generation of Acid Mine Drainage (AMD). These waters e xhibit very different chemical and physical properties depending on their origin and the geochemical nature of the site of exploitation. Low pH, high concentration of sulphates and various heavy metals cause their deleterious effect on the environmen t. Treatment methods to address AMD are focused on neutralizing, stabilizing and re moving pollutants through various physical, chemical and biological processes. This paper reports the results of studies conducted to develop and optimise the process of selective sequential precipitation (SSP). This process allows removing of selected metals (Fe, Cu, Al, Zn, Mn) from real AMD in the form of hydroxides using solution of sodium hydroxide and sulphides using bacterially produced hydrogen sulphide at the various values of pH.
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References9
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