Gypsum (Marine) Reduction with Kutch Lignite

Central Salt and Marine Chemicals Research Institute, Bhavnagar (Gujarat)

(Manuscript received 25 October 1971; revised 24 January 1972; accepted 28 March 1972)

The decomposition of marine gypsum has been studied at the laboratory stage with Kutch lignite. The experimental ratio for gypsum to fixed carbon in the lignite is 1 : 2. The reaction is completed in less than 30 min at 800°C. With higher percentage of lignite, the small amount of sulphur in the lignite leads to sulphide formation.