C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/314
C22B 19/00 (2006.01) C22B 1/20 (2006.01) C22B 1/24 (2006.01)
Patent
CA 1043110
ABSTRACT OF THE DISCLOSURE An improvement has been provided in the production of reduced iron pellets from a material consisting mainly of dust exhausted from metallurgical furnaces for iron steel production, such as, for example, blast furnaces, converters, hearth furnaces and electric furnaces, and/or a mixture thereof, by the grate-kiln system for firing. The procedure involves the use of a travelling grate, and a rotary kiln. Hot exhaust gases from the rotary kiln are first passed through a hardening zone and then through a preheating zone first to harden and then to preheat green pellets moving therein. The exhaust gases are then intro- duced into a first dust collector, where dust of a high zinc content is collected from the exhaust gases, so that the exhaust gases are substantially completely free of zinc values. The exhaust gases so purified are then passed through a drying zone to dry green pellets moving therein. The exhaust gases are then introduced into a second dust collector, where dust is further collected from the exhaust gases. The exhaust gases are discharged out of a stack to open air. When the temperature of the exhaust gases which have passed the first dust collector is not high enough to be useful as a heat source for drying green pel- lets moving in the drying zone, the temperature of gases for drying is raised as follows. Hot gases, which are separately produced, e.g., by a fuel burner, are introduced into the drying zone. The dust of high zinc content col- lected by the first dust collector is used as a material for zinc refining. -1-
216068
Honda Akira
Miyakado Satoru
Shiohara Katsuaki
Yatsunami Kazuharu
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