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Zn is to be recovered from an ore containing ZnS. The ore is first roasted with...

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Chemistry

Zn is to be recovered from an ore containing ZnS. The ore isfirst roasted with oxygen to produce ZnO, which is leached withaqueous H2SO4 to produce water - soluble ZnSO4 and an insoluble,worthless residue called gangue. The decanted sludge of 20,000 kg/hcontains 5 wt% water, 10 wt% ZnSO4, and balance as gangue. Thissludge is to be washed with water in a continuous, countercurrentwashing system to produce an extract, called a strong solution, of10 wt% ZnSO4 in water, with a 98% recovery of ZnSO4. Assume thatunderflow from each washing stage contains, by weight, two parts ofwater (sulfate - free basis) per part of gangue. Determine thestages required.

Answer & Explanation Solved by verified expert
4.4 Ratings (785 Votes)
The stages required for purification of Zinc from its ore ZnS is Roasting ZnS ore is heated in presence of air above 9000c on the reberveratory furnace During roasting Zinc sulphide is converted to Zinc Oxide    See Answer
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