Global Patent Index - EP 0992594 A1

EP 0992594 A1 2000-04-12 - Process of reducing dioxine and furan emissions in iron ore agglomeration installations

Title (en)

Process of reducing dioxine and furan emissions in iron ore agglomeration installations

Title (de)

Verfahren zur Verringerung der Dioxin- und Furanemission bei der Sinteragglomeration von Eisenerzen

Title (fr)

Procédé de réduction des émissions de dioxines et de furanes par les installations d'agglomération de minerais de fer

Publication

EP 0992594 A1 (FR)

Application

EP 98870210 A

Priority

EP 98870210 A

Abstract (en)

An inhibitor comprising a concentrated aqueous calcium oxide or hydroxide suspension is introduced before or during the agglomeration process, to inhibit formation of dioxins and furans. The inhibitor can be directly mixed with the constituents before being fed into the plant, or can be introduced at the same time as one of the constituents, preferably coal powder. The inhibitor is an agent capable of liberating ammonia under operational conditions, particularly at the agglomeration temperature. The mixing operations are carried out in a rotary mixer (drum), and moisture contents of up to 8% of the total supplied material are possible.

Abstract (fr)

La présente invention se rapporte à un procédé de traitement de minerais de fer et/ou des ses additifs, caractérisé par l'étape consistant à introduire un inhibiteur de formation de PCDD/F préalablement ou durant le processus, notamment le processus d'agglomération. De préférence le procédé comporte la pulvérisation d'hydroxide de calcium sous forme d'un lait de chaux sur le coke à mesure que celui-ci est prélevé du silo de stockage. Le coke traité, les minerais et les adjuvants sont reçus sur une bande transporteuse qui les amène au mélangeur, d'où le mélange est acheminé vers la bande d'agglomération. <IMAGE>

IPC 1-7 (main, further and additional classification)

C22B 1/16; C22B 1/20; C22B 1/245; C22B 1/243

IPC 8 full level (invention and additional information)

C22B 1/16 (2006.01); C22B 1/20 (2006.01); C22B 1/243 (2006.01); C22B 1/245 (2006.01)

CPC (invention and additional information)

C22B 1/243 (2013.01); C22B 1/16 (2013.01); C22B 1/20 (2013.01); C22B 1/245 (2013.01)

Citation (search report)

  • [E] EP 0875587 A1 19981104 - BRITISH STEEL PLC [GB]
  • [X] EP 0421979 A1 19910410 - VOEST ALPINE STAHL DONAWITZ [AT], et al
  • [X] EP 0526446 A2 19930203 - VOEST ALPINE STAHL DONAWITZ [AT], et al
  • [X] EP 0535699 A1 19930407 - SUMITOMO METAL IND [JP]
  • [X] BE 1008097 A6 19960116 - CENTRE RECH METALLURGIQUE [BE]
  • [X] PATENT ABSTRACTS OF JAPAN vol. 003, no. 104 (C - 057) 4 September 1979 (1979-09-04)
  • [X] DATABASE WPI Section Ch Week 7718, Derwent Publications Ltd., London, GB; Class M24, AN 77-31923Y, XP002094325
  • [X] DATABASE WPI Section Ch Week 8431, Derwent Publications Ltd., London, GB; Class M24, AN 84-191301, XP002094326

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0992594 A1 20000412

INPADOC legal status


2000-08-09 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20000512

2000-04-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19981015

2000-04-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-04-12 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI