(19)
(11) EP 0 576 212 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.11.1994 Bulletin 1994/47

(43) Date of publication A2:
29.12.1993 Bulletin 1993/52

(21) Application number: 93304736.7

(22) Date of filing: 17.06.1993
(51) International Patent Classification (IPC)5: B22D 1/00, C22B 9/05, B22D 41/58
(84) Designated Contracting States:
DE ES FR IT

(30) Priority: 18.06.1992 GB 9212953

(71) Applicant: FOSECO INTERNATIONAL LIMITED
Nechells Birmingham B7 5JR (GB)

(72) Inventors:
  • Cullen, Liam
    Erdington, Birmingham, B24 9DY (GB)
  • Clark, Michael Robert
    Stourbridge, West Midlands (GB)

(74) Representative: Eyles, Winifred Joyce 
Burmah Castrol Group Patents Department Burmah Castrol House Pipers Way
Swindon, Wiltshire SN3 1RE
Swindon, Wiltshire SN3 1RE (GB)


(56) References cited: : 
   
       


    (54) Purifying molten metal


    (57) Unwanted solid, non-metallic inclusions are removed from molten metal in a refractory-lined vessel by bubbling inert gas upwardly through the metal.
    The invention provides a gas permeable nozzle block (16) shaped to contain a nozzle (17) with a centrally-disposed through bore and to be sealingly set in the refractory lining (13) of a vessel (10) to contain molten metal, the nozzle block (16) having a gas-receiving channel (18) to extend around the nozzle (17) and means to connect the gas-receiving channel (18) to a source of gas.






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