C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/354
C22B 7/02 (2006.01) C21B 13/08 (2006.01)
Patent
CA 1169662
ABSTRACT OF THE DISCLOSURE In a method for recovering zinc and lead from a dust containing ferric oxide, zinc oxide and lead oxide dis- charged from a metal refining metallurgical furnace, the dust is charged into the entry of a rotary kiln together with a granular carbonaceous reducing agent. The atmosphere of the interior of the kiln comprises a reducing atmosphere zone accounting for a major portion of the interior including the entry section of the kiln and an oxidizing atmosphere zone accounting for a minor portion of the interior including at least a part of the exit section of the kiln. The tempera- ture of the interior of the kiln is increased by the combus- tion of a fuel from at least one burner installed at the exit section of the kiln directed toward the interior of the kiln. The dust is reduced in the reducing atmosphere zone to vaporized zinc and lead, and also to reduce the ferric oxide into ferrous oxide. The resultant zinc and lead are reoxi- dized in the oxidizing atmosphere zone, and discharged from the kiln, together with exhaust gases produced in the kiln to recover zinc and lead. The method includes the characterizing step of reoxidizing the ferrous oxide into the ferric oxide in the oxidizing atmosphere zone. The characterizing step has an effect enabling saving an amount of the reducing agent used as the fuel which corresponds to the amount necessary to generating the heat corresponding to that obtained by the re- oxidation heat of the ferrous oxide.
383309
Suzawa Yoshiro
Watanabe Hisashi
Yatsunami Kazuharu
Himeji Tekko Refine Co. Ltd.
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
Toshin Seiko Kabushiki Kaisha
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