Removing sulphur di:oxide from flue gas from cupola furnace - by washing with caustic soda soln., oxidising resulting sodium bi:sulphite to sodium sulphate, and evaporating water by mixing with hot slag from furnace

摘要

In a process for eliminating SO2 from the effluent gases from a cupolar furnace using a caustic soda wash, after absortion of the flue gas and subsequent oxidn. of the Na bisulphite to Na sulphate, the aq. Na sulphate soln. is led into the cooling slag to evaporate its water content. USE/ADVANTAGE - The process avoids a separate processing stage for recovering the Na sulphate, utilises waste heat in the slag to evaporate off the water, and gives the Na sulphate in the form in which it can be dumped together with the slag