Method for treating waste water used in alkali metal hydroxide m

Details Method for treating waste water used in alkali metal hydroxide m Method for treating waste water used in alkali metal hydroxide m

1999-10-14

2000-09-26

Reifsnyder, David A.

Liquid purification or separation

Processes

Using magnetic force

210737, 210774, 210781, 210787, 210799, 210806, 205346, 205508, 205510, 204240, 204241, B01D 3506, B01D 3518, B01D 3700, C25B 116

Patent

active

061238538

ABSTRACT:
A method to process waste water by removing metals, such as nickel or iron during the production of alkali metal hydroxides comprising the steps of: mixing the waste water with a cell liquor and blending the two fluids, magnetically removing up to 33% of the metals present in the solution from blended fluids using a first magnet prior to evaporation, flashing and cooling of the blended fluids, and then magnetically removing an additional amount of metals from the resultant more concentrated caustic solution using with a second magnet prior to filtration of the more concentrated caustic solution.

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patent: 4260469 (1981-04-01), McIntyre et al.
patent: 5290470 (1994-03-01), Dutcher
Eriez Manufacturing Co., Ferrous Traps (SB-420P), 1998, 8 pages.
OxyTech Systems, Inc. (Tilak Bommaraju & Paul Orosz), Caustic Evaporator Coorosion: Causes and Remedy, Mar. 1992, 15 pages.

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