Process for producing sulfuric acid from waste acid and iron sul

Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing

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423 83, 423522, 423540, 423632, 423154, 423DIG2, C01B 1790, C01B 1750, C01G 2300, C01G 4902

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active

041630475

ABSTRACT:
A process for the recovery of sulfuric acid from waste sulfuric acid containing iron sulfate and from solid iron sulfate of high water content of crystallization which consists essentially of:
A. concentrating waste sulfuric acid to an acid concentration of 25-55 weight percent, based upon the suspension, by removing water therefrom;
B. mixing the concentrated acid of Step A with recycled concentrated sulfuric acid obtained from Step E to form a resultant acid mixture of acid concentration of 30-65 weight percent, based upon the suspension;
C. adding said solid iron sulfate of high water content of crystallization to the acid mixture of Step B thereby obtaining iron sulfate of low water content of crystallization;
D. separating the iron sulfate of low water content from the resultant sulfuric acid solution of Step C;
E. concentrating the separated sulfuric acid solution of Step D to an acid concentration of 45-70 weight percent, based on salt-free acid, and recycling at least a portion thereof to Step B; and
F. thermally decomposing the iron sulfate from Step D to produce iron oxide and sulfur dioxide.

REFERENCES:
patent: 2098056 (1937-11-01), McBerty
patent: 2184419 (1939-12-01), Fowler et al.
patent: 2185095 (1939-12-01), Smith et al.
patent: 2202414 (1940-05-01), Barnes et al.
patent: 2960391 (1960-11-01), Sweet et al.

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