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US 3,961,031 AGranted
Method for removal of mercury in sulfur dioxide-containing gas
AssigneeNippon Mining Co., Ltd.
InventorsHiroshi Yasui, Iwao Kyono, Hideo Aoki, Haruo Manabe
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Abstract
A method for the removal of mercury contained in a sulfur dioxide-containing gas which comprises contacting the sulfur dioxide-containing gas with an aqueous thiourea solution which optionally contains an acid at an acid concentration higher than one normal to selectively absorb mercury in a vapor state.
Claims7
A method for the removal of mercury vapor contained in a sulfur dioxide-containing gas containing at least 0.1% by volume sulfur dioxide which comprises contacting the sulfur dioxide-containing gas with an aqueous thiourea solution having a pH below 0.5.
Dependencies are inferred from the claim text.