Watson, Cole, Grindle & Watson
Method for recovery of Zn and Pb from iron and steel dust
 A method of recovering Zn and Pb from iron and steel dust wherein the interior of a rotary smelting furnace connected to the discharge side of a rotary kiln is heated by a burner 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. 
Sumitomo Metal Mining Company Limited
Y Y C
Y10S Y02P C22B
additional additional inventional
Yukio Yoshiaki Yasuo Hiromi Motohiro
Ishikawa Mori Ojima Harada Yasukawa