(19)
(11) EP 0 296 585 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.04.1990 Bulletin 1990/15

(43) Date of publication A2:
28.12.1988 Bulletin 1988/52

(21) Application number: 88110019.2

(22) Date of filing: 23.06.1988
(51) International Patent Classification (IPC)4: B03B 1/02, B07B 9/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 24.06.1987 JP 155430/87

(71) Applicant: NKK CORPORATION
Tokyo (JP)

(72) Inventors:
  • Zaitsu, Masaru Patent & License And Quality
    1-2 1-chome, Marunouchi Chiyoda-ku Tokyo (JP)
  • Aoshika, Katsuyuki Patent & License And Quality
    1-2 1-chome, Marunouchi Chiyoda-ku Tokyo (JP)
  • Nakanishi, Kazuo Patent & License And Quality
    1-2 1-chome, Marunouchi Chiyoda-ku Tokyo (JP)
  • Nakada, Goro Patent & License And Quality
    1-2 1-chome, Marunouchi Chiyoda-ku Tokyo (JP)

(74) Representative: Füchsle, Klaus, Dipl.-Ing. et al
Hoffmann, Eitle & Partner, Patentanwälte, Postfach 81 04 20
81904 München
81904 München (DE)


(56) References cited: : 
   
       


    (54) Method for separating crusts and substrates


    (57) A method for separating crusts and substrates comprises the steps of: classifying mixed ores composed of crusts and substrates, as a first classification step, by at least one first classifier (1), into plurality of groups of classified ores; crushing each of the groups of the classified ores into plurlaity of groups of crushed ores by crushers (2a,2b,2c) equipped with heaters, each, while the classified ores are kept heated; and classifying each of the groups of the crushed ores as a second classification step, by at least one second classifier (3a,3b,3c), thereby to separate the crusts and the substrates. The heating of the classified ores can be separately carried out by an independent heating apparatus before the crushing of the classified ores. The temperature of the heating is at 500 to 1,300°C. 800 to 1,000°C is more preferable.







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