Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1977-07-08
1978-08-15
Hearn, Brian
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
423240, 423488, 423493, 423633, 423DIG1, 134 10, 214 35R, C01G 4902, C01G 4910, C01B 701
Patent
active
041072677
ABSTRACT:
A process for regenerating waste acid, such as waste hydrochloric acid pickling liquor by producing aqueous hydrochloric acid of pickling concentration and generating iron oxide including that of pigment grade, comprises the steps of (1) concentrating the waste liquor, (2) reacting the concentrated liquor at a temperature below 1000.degree. F. in the presence of oxygen and hydrocarbon combustion gases and on a recycled moving bed of particles without vibration of the reactor bottom, (3) separating the iron oxide dust from the other gases from the reactor, (4) cooling these gases using the same concentrator, (5) absorbing the hydrogen chloride from the cooled gas in an aqueous solution, (6) scrubbing the unabsorbed gases in water to absorb the hydrogen chloride gas remaining in the gases from the absorber, and (7) condensing any liquids and any residual HCl remaining in the exhaust gases before exhausting them as non-polluting gases into the atmosphere and passing the condensate back into the waste acid concentrator.
REFERENCES:
patent: 1882864 (1932-10-01), Nickerson
patent: 1918398 (1933-07-01), Johnson
patent: 1955038 (1974-04-01), Walker et al.
patent: 3342557 (1967-09-01), Metaizeau
patent: 3549351 (1970-12-01), Lundquist
patent: 3745207 (1973-07-01), Hansen
Gerber Eliot S.
Hearn Brian
Toledo Pickling & Steel Service, Inc.
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