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A novel process for the regeneration and purification of spent electrolyte from sodium hydroxide zinc metallurgy to reduce sodium hydroxide consumption is reported in this paper. This is achieved through a method of causticisation, which maintains the quality of zinc metal powder. This process consists of two steps: sodium carbonate separation and causticisation. The sodium carbonate in the spent...
An integrated hydrometallurgical process for the production of zinc and lead concentrates from lean oxidized zinc ores by alkaline leaching, followed by two-step sulfide precipitation of lead and zinc sulfides, is developed. The lean zinc oxidized ore was firstly ground to a size below 0.2mm, followed by alkaline leaching at 90°C for 120min in NaOH solution, in which both zinc and lead are effectively...
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