Method for removal of nickel and iron from alkali metal hydroxid

Details Method for removal of nickel and iron from alkali metal hydroxid Method for removal of nickel and iron from alkali metal hydroxid

1999-10-14

2000-06-27

Phasge, Arun S.

Electrolysis: processes, compositions used therein, and methods

Electrolytic synthesis

Preparing inorganic compound

205536, 210695, C25B 134

Patent

active

060802995

ABSTRACT:
The method involves the steps of: exposing a cell liquor containing metal to a first magnet, magnetically removing up to about one third of said metal present in the cell liquor, evaporating a significant amount of water out of that fluid, and raising the temperature of that fluid to above 220 Fahrenheit and adding a small amount of sodium borohydride (NaBH.sup.4) to suppress the reaction of the caustic solution with metal in the manufacturing process, evaporating and flashing off more water from the caustic solution, cooling the solution after evaporation and then flowing it through and around a second magnet to magnetically removing an additional amount of metal the solution, filtering the solution and then magnetically removing an additional amount of metal from said solution forming a final caustic solution having 40-55% by weight caustic.

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OxyTech Systems, Inc. (Tilak Bommaraju & Paul Orosz), Caustic Evaporator Coorosion: Causes and Remedy, Mar. 1992, 15 pages.

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