Method and apparatus for recovering acid and metal salts from pr

Details Method and apparatus for recovering acid and metal salts from pr Method and apparatus for recovering acid and metal salts from pr

1995-05-19

1996-10-08

Fortuna, Ana

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210644, 210649, 210181, 210774, 2101952, 423139, 423140, 62541, B01D 1504, B01D 1100, B01D 3518

Patent

active

055628281

ABSTRACT:
Spent acid contaminated with metal salts in a hot solution removed from a metal pickling bath is directed to one side of an anionic membrane to separate acid ions from the metal salt solution by diffusion dialysis through the membrane. Most of the metal salts in the remaining low acidity mother liquor are crystallized by refrigerating the mother liquor. The crystals are dewatered (in a centrifuge, for example) to produce a commercially viable noncorrosive byproduct, and the substantially decontaminated mother liquor is directed to the opposite side of the diffusion membrane, where it receives the acid ions diffusing through the membrane, and is then recycled to the pickling bath. Heat interchange between the hot spent acid solution and the recycled acid lowers the temperature of the spent acid to an optimum value for dialysis while raising the temperature of the recycled acid to close to the bath temperature. Heat interchange between the contaminated mother liquor leaving dialysis and the refrigerated decrystallized mother liquor precools the contaminated liquor prior to refrigeration and concurrently warms the returning mother liquor to near optimum dialysis temperature.

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Brown, C., "Productivity improvements through recovery of pickle liquors with the APU process", Iron and Steel Engineer, Jan. 1990, pp. 55-60.
Brown, C., "Acid/Metal Recovery by Recoflo Sorption," presented at the 23rd Conference of Metallurgists of the CIM, Quebec City, Quebec, Aug. 19-22, 1984, pp. 1-15.
"Final Report Reclamation And Re-Use Of Spent Hydrochloric Acid Hazardous Waste Reduction Grant," Pace Laboratories, Inc., Feb. 14, 1986, pp. 1-44.
Link, W. F., "The Solubility Of Ferrous Sulfate In Sulfuric Acid Solutions", Soolubilities Inorganic& Metal Compounds, vol. 1 & 2, 4th Ed., pp. 1047-1051 (1958).
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