Working up sodium sulfate-containing residues

Details Working up sodium sulfate-containing residues Working up sodium sulfate-containing residues

1989-08-30

1990-11-20

Russel, Jeffrey E.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423540, 423541R, 423542, C01B 1752, C01B 1774

Patent

active

049717812

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.

REFERENCES:
patent: 2726143 (1955-12-01), Mares
patent: 3061408 (1962-10-01), Lurie
patent: 4237103 (1980-12-01), Prible
patent: 4704136 (1987-11-01), Weston et al.
patent: 4808264 (1989-02-01), Kignell
patent: 4857282 (1989-08-01), Mullen

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