Process and apparatus for the low temperature recovery of ferrou

Details Process and apparatus for the low temperature recovery of ferrou Process and apparatus for the low temperature recovery of ferrou

1990-04-23

1991-10-15

Lewis, Michael L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423488, 423493, 62544, B01D 902, C01B 707, C01G 4910

Patent

active

050572903

ABSTRACT:
Processes and apparatus for the closed-loop regeneration of spent hydrochloric acid pickle liquors that have been used to pickle ferrous metals by recovering ferrous chloride from the spent pickle liquors at very low temperatures. The process includes maintaining the hydrochloric acid and iron concentrations within the spent pickle liquor at levels that will prevent the liquor from freezing when cooled to about -10 degrees Fahrenheit and that will permit the formation of ferrous chloride crystals within the spent pickle liquor when the liquor is cooled below about +18 to 20 degrees Fahrenheit and to about -10 degrees Fahrenheit. The ferrous chloride crystals formed at such low temperatures are then removed from the pickle liquor, which then permits reuse of the free hydrochloric acid remaining within the thus regenerated pickle liquor in normal pickling operations.

REFERENCES:
patent: 3540513 (1970-11-01), Sumiya et al.
patent: 3900955 (1975-08-01), Peterson

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