SLAG-FUMING METHOD

• Main Authors: FUJITA KEIJI, TAKAHASHI JUNICHI
• Format: Patent
• Language: English
• Published: 17.09.2009
• Subjects: 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

PROBLEM TO BE SOLVED: To provide a slag-fuming method where, in a slag-fuming method in which, while charging slag containing zinc, lead, arsenic and a halogen group element produced from a refining furnace in zinc and/or lead refining, and a copper source inside a fuming furnace, so as to form a fused body, zinc and lead are volatilized to separate by fuming, energy cost is reduced under the high volatilizing speed of zinc, and also, zinc lead-containing dust in which the content of a halogen group element is reduced can be obtained. SOLUTION: Upon the above fuming, a carbonaceous reducing agent and limestone are added to the inside of a furnace, and further, the air in an amount sufficient for burning the surplus reducing agent is fed into a vapor phase part within the furnace, so as to prevent the reduction of slag temperature. COPYRIGHT: (C)2009,JPO&INPIT