Procedure for the purification and recovery of mercury in metall

Details Procedure for the purification and recovery of mercury in metall Procedure for the purification and recovery of mercury in metall

1991-11-05

1993-08-03

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75670, C22B 4300

Patent

active

052324885

ABSTRACT:
A process is described for the recovery, in metallic form, of mercury present in roasting gases, containing SO.sub.2, so that the purified gas has less than 0.1 mg/m3 of this element. Essentially, the system consists of a conventional device for the cooling and scrubbing of the gas; two irrigated towers with an acid solution of Hg(SCN).sub.4.sup.2- free SCN.sup.- and active carbon; two wet electrostatic precipitators, one in front of the first tower and another between them and a reactor for scrubbing the emulsion (soot) obtained from the condensation, with ammonium. All mercury-bearing tailings are recycled to the roasting oven at appropriate intervals, until under certain conditions the hot gases attain a mercury content of more than 40 mg/m3.

REFERENCES:
patent: 3961031 (1976-06-01), Yasui et al.

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