公开(公告)号：EP3147023A4

公开(公告)日：2017-10-25

申请号：EP15795643

申请日：2015-05-18

Applicant: CHIYODA CORP

Inventor： TAKEDA DAI ,  AWAI EIJI ,  MATSUMOTO JUN ,  UEMURA MASATAKA ,  MARUKAWA HIRONOBU

IPC: B01D53/64 ,  B01D53/78 ,  B01D53/96 ,  C01G13/00 ,  C02F1/62 ,  C02F1/76

CPC classification number: B01D53/64 ,  B01D53/78 ,  B01D53/96 ,  B01D2251/108 ,  B01D2251/30 ,  B01D2257/602 ,  C01G13/00 ,  F23J15/04 ,  F23J2215/60

Abstract: The invention provides a treatment process of a gas containing zero-valent mercury and a mercury separation system, by which the amount of an iodine compound used can be reduced when the zero-valent mercury is separated from the gas containing the zero-valent mercury by using the iodine compound. The treatment process of the gas containing the zero-valent mercury has a mercury oxidation step of oxidizing the zero-valent mercury contained in the gas containing the zero-valent mercury with a first liquid phase containing an alkali metal iodide to take the zero-valent mercury into the first liquid phase, thereby obtaining a second liquid phase containing a divalent mercury ion and an iodide ion; a mercury separation step of separating the divalent mercury ion as mercury sulfide by adjusting the pH of the second liquid phase obtained in the mercury oxidation step with a pH adjustor and adding an alkali metal sulfide; and a first circulation step of circulating a third liquid phase which is obtained by separating the mercury sulfide in the mercury separation step and contains an alkali metal ion and the iodide ion to use the third liquid phase as the first liquid phase in the mercury oxidation step.