TREATMENT OF MERCURY-CONTAINING WASTE WATER

PURPOSE:To accelerate the vaporization speed of metal mercury and to reduce equipment such as a vaporization tank, by adding a reducing agent to mercury- containing waste water to form metal mercury while vaporizing the same in the presence of an aluminum salt. CONSTITUTION:A reducing agent such as...

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Bibliographische Detailangaben
Hauptverfasser:	OOKUBO TAKASHI, ETOU YOSHIHIRO, KOUNO HIROSHI, ITOU YUKIO, SUZUKI YUMI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PURPOSE:To accelerate the vaporization speed of metal mercury and to reduce equipment such as a vaporization tank, by adding a reducing agent to mercury- containing waste water to form metal mercury while vaporizing the same in the presence of an aluminum salt. CONSTITUTION:A reducing agent such as sulfite, dithionite or a boronhydride compound is added to a mercury-containing waste water such as waste water from a mercury process salt electrolytic factory or waste water from a mercury mine to form metal mercury. Subsequently, vaporization treatment of the fromed metal mercury is performed in the presence of an aluminum salt such as aluminum sulfate, aluminum chloride or polyaluminum chloride. The addition amount of aluminum may be about 40-400mg/l as Al and vaporization treatment is performed while air or nitrogen gas is passed. Metal mercury is vaporized by gas passing and reductive reaction of ionic mercury and a mercury compound is also promoted by gas passing effect.