Method of purifying aqueous solutions of metal hydroxides

Details Method of purifying aqueous solutions of metal hydroxides Method of purifying aqueous solutions of metal hydroxides

1978-12-04

1981-04-07

Wyse, Thomas G.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210914, 204 99, C02F 172

Patent

active

042604940

ABSTRACT:
A process is disclosed for purifying aqueous solutions of metal hydroxides.
An aqueous solution of a metal hydroxide, such as sodium hydroxide, containing a complex of a heavy metal contaminant, such as mercury, is heated.
An oxidizing agent, such as hydrogen peroxide, is reacted with the solution to precipitate solid particles of an oxide of the heavy metal, for example, mercuric oxide, in a solution. The solid particles of mercuric oxide are separated from the solution by filtration.
The purified solution comprised of water and sodium hydroxide and containing less than about 0.3 part per million mercury by weight is sold commercially. The solid particles of mercuric oxide are landfilled or otherwise utilized.

REFERENCES:
patent: 3674428 (1972-07-01), Dean et al.
patent: 3764495 (1973-10-01), Guptill et al.
patent: 3764496 (1973-10-01), Hultman et al.
patent: 3847598 (1974-11-01), Coulter et al.

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