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Production of sodium sulphite from smelter off-gas

CHANG Quan zhong (Chemical Plant,Jingchuan Co., Ltd., Jingchang, Gansu, 737104, China)  
Sodium sulphite is produced by reaction of low SO 2 smelter off gas with about 11 5wt% sodium hydroxide solution The plant operates with a SO 2 absorption of 99 6% and the product is up to the first class specification of national standard without any waste effluence The design adopts double effect falling film evaporators for concentration,baffling vacuum filter for ferrous removal,vibrating fluidized bed for dehydration,and DCS for automatic control,resulting in increased labor productivity and reduced energy consumption
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