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Throughout electrowinning a portion of the electrolyte passes by cooling towers to decrease its temperature and to evaporate the water it collects through the process. The entire calcining processes generate sulphur dioxide, which is managed and converted to sulphuric acid as a marketable course of by-product. 4 processing levels are usually used in hydrometallurgic zinc refining: calcining, leaching, purification and electrowinning.

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