C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/324, 53/340
C22B 7/02 (2006.01) C22B 13/00 (2006.01) C22B 19/30 (2006.01)
Patent
CA 1222140
ABSTRACT OF DISCLOSURE The invention is directed to a method of recovering Zn and Pb from iron and steel dust. According to the method the interior of a rotary smelting furnace connected to the discharge side of a rotary kiln is heated by heating means disposed on the outlet side of the rotary smelting furnace; a heating gas is introduced into the rotary kiln to subject the iron and steel dust containing Zn and Pb which was fed in the rotary kiln to a preliminary reduction with the aid of a reducing agent and, if required, a flux so as to volatilize Zn and Pb; and the product of the rotary kiln is fed into the rotary smelting furnace with addition of a flux to melt the resultant mixture and further volatilize Zn and Pb entrained in the product. The method is so effective to recover Zn and Pb at a high ratio of volatilization and prolong the duration of con- tinued furnace operation. - 17 -
459667
Harada Hiromi
Ishikawa Yukio
Mori Yoshiaki
Ojima Yasuo
Yasukawa Motohiro
Kirby Eades Gale Baker
Sumitomo Metal Mining Co. Ltd.
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