Iron ore sintering process with reduced emissions of toxic gases by waste gas recirculation

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(11)

EP 1 038 980 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.12.2000 Bulletin 2000/49

(43)	Date of publication A2:
	27.09.2000 Bulletin 2000/39

(21)	Application number: 00301900.7

(22)	Date of filing: 08.03.2000

(51)	International Patent Classification (IPC)⁷: C22B 1/20

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

19.03.1999 GB 9906323

(71)	Applicant: Corus UK Limited
	London W1V 2BS (GB)

(72)	Inventor:
	Southern, Stuart Martyn Pencoed, Mid Glamorgan CF35 6NX (GB)

(74)	Representative: Fry, Alan Valentine et al
	FRY HEATH & SPENCE The Old College 53 High Street Horley Surrey RH6 7BN Horley Surrey RH6 7BN (GB)

(54)	Iron ore sintering process with reduced emissions of toxic gases by waste gas recirculation

(57) A method of sintering iron ore in a sinter strand comprises providing a sinter feedstock and depositing said feedstock onto a travelling grate, igniting said feedstock using a sinter strand burner(s), and combusting said feedstock by drawing air through the feedstock with a plurality of wind boxes situated along the length of the strand, to produce sintered products rich in iron and waste gases. Waste gases from only those wind boxes whose temperature exceeds a predetermined level (200-250°C) are recycled to provide combustion feed air for the feedstock or air for the sinter strand ignition burner(s), thereby substantially reducing or eliminating the production and/or emission of dioxins.

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