Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1991-12-23
1993-05-18
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210681, 210688, 210912, 210913, C02F 128
Patent
active
052118525
ABSTRACT:
Provided is a process for the removal of metal ions from water which comprises filtering the water through a bed or layer of granular lightburned or hardburned magnesium oxide. The use of granular hardburned or granular lightburned grades of the magnesium oxide provides one with a most effective process for the removal of metal ions, as well as a process which permits a greater throughput of water before the effectiveness of the magnesium oxide decreases substantially.
The process of the present invention also involves an acidic backwash to regenerate the granular magnesium oxide. The acidic backwash is used to strip the captured metal ions from the surface of the granules, and has been found to be quite effective. The acid is generally a dilute acid, e.g., about 1 to 10 percent by weight acid concentration.
REFERENCES:
patent: 4181607 (1980-01-01), Schiller et al.
patent: 4752397 (1988-06-01), Sood
patent: 4834957 (1989-05-01), Van de Walle
Schiller et al., "Removal of Heavy Metals from Water", Published U.S. patent application Ser. No. 06/318,710, Department of the Interior, PB83-140913.
Schiller et al., "Removal of Heavy Metals from Water", Published U.S. patent application Ser. No. 06/325,269, Department of the Interior, PB83-140905.
J. E. Schiller, D. N. tallman & S. E. Khalafalla, "Mineral Processing Water Treatment Using Magnesium Oxide", Environmental Progress, May 1984, pp. 136-141.
Smith David M.
Van de Walle Richard H.
Wajer Mark T.
Chin Gay
Cintins Ivars
Martin Marietta Magnesia Specialties Inc.
Winchell Bruce M.
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