Sulfuric acid waste recycling by regenerative process

Details Sulfuric acid waste recycling by regenerative process Sulfuric acid waste recycling by regenerative process

1996-06-25

1998-03-24

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423522, 4235411, 423DIG2, C01B 1790, C01B 1769, C01B 1750

Patent

active

057309507

ABSTRACT:
The process will recover sulfuric acid on the 90-95% concentration range by roasting of ferrous sulfate hydrate crystals at high temperature under retort conditions. In the first step of the recovery process 6 (see FIG. 1) hydroxide slurry is reacted with the waste stream, and ferrous sulfate crystals obtained. In the second step 9 iron sulfate crystals are roasted and water of hydration reacts with sulfate and sulfur trioxide to produce sulfuric acid in a retort operation. The sulfuric acid and sulfur trioxide are condensed or absorbed in water or dilute sulfuric acid and are of a high purity, leaving iron oxide as a recovered carrier. In the third step, this iron oxide/hydroxide is reduced 13 and used to produce a slurry, which is pumped back to react with the entering sulfuric acid waste stream. The process has the following advantages:

REFERENCES:
patent: 2055419 (1936-09-01), Rosenstein
patent: 2280508 (1942-04-01), Bousquet et al.
patent: 3676107 (1972-07-01), Barnard et al.
patent: 3745207 (1973-07-01), Hansen
patent: 3906039 (1975-09-01), Furkert
patent: 3917800 (1975-11-01), McGauley et al.
patent: 4083693 (1978-04-01), Hansen
patent: 4153628 (1979-05-01), Gerken et al.
patent: 4163047 (1979-07-01), Dorr et al.

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