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Next, the zinc calcine resulting from roasting and the concentrate fed through direct leaching are leached in sulphuric acid recycled from electrolysis, and this produces zinc sulphate solution. Iron is precipitated and filtered from the process in the form of jarosite.
The sulphides in the concentrate are oxidized into elemental sulphur, which is separated from the jarosite through flotation. The resulting concentrate is filtered, washed and stored in a separate basin.
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