B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
53/6
B01D 53/34 (2006.01) B01D 53/50 (2006.01) C21B 13/08 (2006.01) C22B 1/02 (2006.01) C22B 1/11 (2006.01)
Patent
CA 1135060
METHOD FOR REMOVING SULFUR OXIDES FROM HOT EXHAUST GASES PRODUCED DURING MANUFACTURE OF REDUCED IRON PELLETS ABSTRACT OF THE DISCLOSURE A method for removing sulfur oxides from hot exhaust gases produced during manufacture of reduced iron pellets, which comprises: using a grate-kiln type furnace including a pretreatment furnace comprising a drying zone, a preheating zone following said drying zone, a hardening zone following said preheating zone, and a travelling grate passing sequen- tially through said zones, and a rotary kiln receiving the output material from said hardening zone; feeding green pellets prepared mainly from a dust principally comprising iron oxides discharged from an iron and steelmaking metallurgical furnace and/or an iron ore fine, together with a granular solid desulfurizing agent, onto the entry side of said travelling grate, said dust and/or said iron ore fine containing a considerable amount of sulfur oxides; passing said green pellets and said solid desulfurizing agent sequentially through said drying zone, said preheating zone and said hardening zone on said travelling grate to said rotary kiln, while passing hot exhaust gases produced in said rotary kiln, in a direction opposite to the travelling direction of said green pellets - 1 - and said solid desulfurizing agent, sequentially through said hardening zone, said preheating zone and said drying zone, thereby drying, preheating and hardening said green pellets in travel on said travelling grate through said zones, and simultaneously preheating said solid desulfurizing agent sufficiently to cause said solid desulfurizing agent to perform statisfactorily the function thereof to absorb the sulfur oxides contained in said hot exhaust gases before charging into said rotary kiln; and, reducing the hardened pellets from said hardening zone in said rotary kiln to manufacture reduced iron pellets, and removing by absorption the sulfur oxides from said hot exhaust gases produced in said rotary kiln during reducing said hardened pellets, by means of said preheated solid desulfurizing agent. - 2 -
337936
Ito Masaharu
Nagano Seiki
Nakamura Yutaka
Shiobara Katsuaki
Yamamoto Ryoji
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
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