METHODS OF WASHING AWAY GYPSEOUS SCALE FROM SCRUBBERS FOR SMOKE DESULPHURIZATION BY THE WET LIME-GYPSUM PROCESS

摘要

1356527 Removing gypseous scale MITSUBISHI JUKOGYO K K 13 Nov 1972 [11 Nov 1971] 52357/72 Heading C7E Gypseous scale formed on scrubbers for smoke disulpherization by the wet lime-gypsum process is removed by washing with an aqueous solution of sodium carbonate. Sulphur containing effluent gas is fed to first and second absorption columns 1, 1' and thence to the atmosphere. Lime slurry is fed to the absorption columns where it is converted into calcium sulphite and sulphate, which are then extracted for gypsum reclaiming. The scale is removed by washing with sodium carbonate fed from a tank 3 by pump 5. After washing, the solution is stored in a tank 4 and fed to a tank 2 where it is mixed with the lime slurry to form calcium sulphite and caustic soda.