Wet-cleaning gases containing sulfur dioxide, halogens and...

Details Wet-cleaning gases containing sulfur dioxide, halogens and... Wet-cleaning gases containing sulfur dioxide, halogens and...

B - Operations, Transporting

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B01D 53/34 (2006.01) B01D 53/46 (2006.01) B01D 53/50 (2006.01) B01D 53/68 (2006.01)

Patent

CA 1079031

A B S T R A C T O F T H E D I S C L O S U R E WET-CLEANING GASES CONTAINING SULFUR DIOXIDE, HALOGENS AND ARSENIC The invention comprises a method of wet-cleaning gases con- taining sulfur dioxide, halogens together with arsenic and/or ar- senic compounds obtained in a pyrometallurgical treatment of sulfi- dic materials. The gases are washed in a diluted sulfuric acid circulating in a closed circuit, from which arsenic is recovered. The gases are then cooled to water condensation whereby the halogens are substantially completely taken up in said condensate and sepa- rated. The separated condensate is then discharged to a recipient after precipitation of residual arsenic and neutralization.

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