Method of and apparatus for recovering mercury from drainage

Details Method of and apparatus for recovering mercury from drainage Method of and apparatus for recovering mercury from drainage

1991-12-09

1993-04-06

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210719, 210750, 210757, 210180, 210188, 210218, 210914, C02F 162, C02F 170

Patent

active

052000877

ABSTRACT:
In a method of and apparatus for recovering mercury from drainage, mercury-containing waste water is fed into a first treating tank where the waste water is heated together with a metal having a stronger ionizing tendency than mercury, to reduce mercury ions in the waste water and free the mercury ions as metallic mercury. The solution under treatment is then transferred to a second treating tank where the solution is alkalinized, and mercury ions remaining in the solution is reduced by means of a water soluble metallic salt having a stronger ionizing tendency than mercury, to free the mercury ions as metallic mercury. Mercury vapor containing gases generating from the first and second treating tanks are cooled in a cooling device, and condensed and liquefied mercury is collected in a gas-liquid separator. Exhaust gas generating from the gas-liquid separator is fed into the solution under treatment in the second treating tank.

REFERENCES:
patent: 3463635 (1969-08-01), Rhodes et al.
patent: 3857704 (1974-12-01), Conlter
patent: 4566975 (1986-01-01), Allgnlin
patent: 4599177 (1986-07-01), Hayashi et al.
patent: 5098579 (1992-03-01), Leigh et al.
patent: 5122279 (1992-06-01), Gross

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