Method for the purification of gases containing mercury and simultaneous recovery of the mercury in metallic form
AssigneeBoliden Aktiebolag
InventorsFrostein Dyvik, Kjetil Borve
Life of this patent
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Abstract
A method for the purification of gases containing mercury and simultaneous recovery of the mercury in metallic form by a process where primarily a reaction takes place between metallic vapory mercury and mercury (II)-chloride compounds in solution in a liquid phase, during which the formation and deposition of only slightly soluble Hg (I)-chloride (calomel) occur, the deposited calomel being oxidized to easily soluble Hg (II)-chloride compounds by the adding of chlorine, and metallic mercury and at least some of the chlorine used being recovered by electrolysis of said formed Hg(II)-chloride.
Claims8
A method for the purification of gas containing mercury and the recovery of mercury in metallic form comprising:
- (a) reacting metallic vaporous mercury in the gas with mercuric chloride compounds in a liquid phase whereby mercurous chloride is formed;
- (b) oxidizing the mercurous chloride with chlorine in a liquid phase whereby a concentrated solution of mercuric chloride compounds is formed;
- (c) subjecting the concentrated solution of mercuric chloride compounds to electrolysis whereby metallic mercury and chlorine is formed;
- and
- (d) supplying said formed chlorine to step (b).
Dependencies are inferred from the claim text.