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

1980-08-18

1982-06-08

Wyse, Thomas G.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

210914, 210721, 204 99, C01D 136

Patent

active

043339131

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: 4147626 (1979-04-01), Findlay et al.
patent: 4260494 (1981-04-01), Dotson et al.

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