B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/356.5
B01D 53/14 (2006.01) B01D 53/64 (2006.01) C22B 43/00 (2006.01)
Patent
CA 1183331
A B S T R A C T The invention relates to a method for separating gaseous elementary mercury from a gas in conjunction with a wet-gas cleaning process comprising a plurality of washing stages. The mercury-containing gas is treated with an aqueous washing liquid conducted in a closed cir- cuit, the liquid containing 0.1 - 300 mmol/l mercury (II) ions and at least twice this amount of ions having the ability of forming complexes with mercury (II) ions, the mercury in the gas being oxi- dized and absorbed in the washing liquid. The invention is charac- terized in that the treatment process is carried out in conjunction with a gas-cooling process effected after the last washing stage of the wet-gas cleaning process, to form a condensate for absorbing the halogens contained in the gas. The resultant condensate is trans- ferred to the washing liquid and the mercury (II) content of the washing liquid is maintained by contacting the washing liquid with an oxidizing agent for mercury (I) ions. The agent used to oxidize mercury (I) ions is preferably chlorine gas.
400970
Boliden Aktiebolag
Gowling Lafleur Henderson Llp
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