Neutralization using lime products is employed in a number of mining operations to precipitate dissolved cations from complex acidic sulphate process solutions, process waste streams, and acidic effluents. The objective of the neutralization step varies widely from narrowly controlled selective cation precipitation to bulk cation co-precipitation. Considerations for process design, control and plant operating practice for a) acidic effluent treatment for discharge, b) selective removal of ferric iron and pentavalent arsenate for bioleach circuit redox control, and c) selective precipitation from a complex Co–As–Cu–Ni–Ag pressure leachate are discussed based on conceptual operating flowsheets.
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