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Question

While ZnS is roasted, the temperature is consistently maintained above
8600C while the influx of air is controlled – True or False?


A

True

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B

False

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Solution

The correct option is A

True


This is to prevent the oxidation of ZnS to ZnSO4 which again converts back into ZnS during the smelting-Carbon Reduction step

Above 8600C and under a controlled blast of air, ZnS + 1.5O2 ZnO + SO2

With excess air and temperature lower than 8600C

ZnS + 2O2 ZnSO4

During smelting,

ZnSO4+ 4C ZnS + 4CO


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