C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 43/00 (2006.01) B01D 53/64 (2006.01) C22B 3/06 (2006.01)
Patent
CA 2054744
ABSTRACT A process is described for the recovery, in metallic form, of mercury present in roasting gases, containing SO2, 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)42- free SCN- 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.
Fernandez Tallants Miguel
Gonzalez-Posada Sanchez Armando
Consejo Superior Investgaciones Cientificas
Marks & Clerk
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