Working up sodium sulfate-containing residues
AssigneeBASF SE
InventorsHermann Meyer, Rainer Roemer, Gerhard Pforr
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Abstract
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.
Claims4
A process for working up a sodium sulfate-containing wastewater residue, wherein the sodium sulfate in the wastewater residue is thermally cleaved in the presence of a reducing agent and silicate-containing additives under reducing conditions at a temperature above 1000.degree. C. to give gaseous sulfides and oxides of sulfur as well as a free-flowing alkaline slag.
Dependencies are inferred from the claim text.