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This document summarizes a process for recovering sulphur and calcium carbonate from waste gypsum. The process involves: 1. Thermally reducing gypsum to calcium sulphide using activated carbon at 1100°C, yielding 96% calcium sulphide. 2. Suspending the calcium sulphide in water and reacting it with carbon dioxide to strip hydrogen sulfide gas and precipitate calcium carbonate. 3. Converting the hydrogen sulfide into elemental sulfur using the PIPCO process, which involves reacting hydrogen sulfide with

Author

youness

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EN