Keil & Weinkauf
Working up sodium sulfate-containing residues
 Sodium sulfate-containing residues are worked up by reducing the sulfate by a process in which the sulfate or a mixture or solution of the sulfate is thermally cleaved by adding oxygen, air or oxygen-enriched air at above 1000.degree. C., in particular above 1200.degree. C., under reducing conditions to give gaseous sulfides and oxides of sulfur as well as alkaline slag. The sulfur compounds contained in the gaseous reaction products can be further processed to sulfur, sulfur dioxide and sulfuric acid. 
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C C C Y C Y C C C C
C04B C04B C01B Y02P C01B Y02W C04B C01B C01B C01B
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Hermann Rainer Gerhard
Meyer Roemer Pforr