Roasting

Roasting

The concentrates are fed into the fluidised bed roaster and roasted with oxygen at 950°C. The objective of the Roasting process is to convert zinc sulphide to acid soluble zinc oxide and sulphur dioxide gas, utilising the following reaction.

2 ZnS + 3O2 = 2ZnO + 2SO2

The solid zinc oxide (ZnO, Calcine) is separated from the gaseous sulphur dioxide (SO2) utilising various techniques. The collected zinc oxide is sent to the Leaching Plant and the sulphur dioxide goes to the Sulphuric Acid Plant via the Gas Cleaning Plant.

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