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    Process for the stagewise fluidized bed roasting of sulfidic iron minerals
    6.
    发明专利
    Process for the stagewise fluidized bed roasting of sulfidic iron minerals 未知

    公开(公告)号：GB930448A

    公开(公告)日：1963-07-03

    申请号：GB3712761

    申请日：1961-10-17

    Applicant: BASF AG

    Inventor： WITTMANN GEORG ,  HILLE JOSEPH ,  WOLF HERBERT

    IPC: C22B1/02 ,  C22B1/10 ,  C22B1/14

    Abstract: Coarse grained roasted ore is obtained by the stagewise roasting of sulfidic iron minerals, such as pyrites or pyrrhotites, in fluidized beds with separate and independent supply of air to the individual fluidized beds and separate and independent withdrawal of the roasted gases from the individual fluidized beds. The sulfidic iron mineral is introduced with a maximum grain size of 10 mm., preferably 8 mm. The height of the fluidized bed in each of the individual fluidized beds is kept at 20-35c m., preferably 25-30 cm. and the amount of air introduced hourly into the pre-roasting stage is kept between 5,700 and 20,000 m3(S.T.P.)/m2 roasting surface and the amount of air introduced hourly in the further roasting stage or stages is kept between 2,000 and 2,700 m3(S.T.P.)/m2 roasting surface. The upper limit of the sulfur content in the preliminary roasted material is given by the atomic ratio of Fe;S equal to 1:1,20. Flotation pyrites can be roasted by the method of the invention if they are first agglomerated into pellets with a diameter up to about 10 mm. A conical fluidized bed furnace, constructed downwardly, can be used at least for the preroasting stage. Specifications 811,859, 814,707 and 886,786 are referred to.

    A fluidised layer process for the production of anhydrous aluminium chloride
    8.
    发明专利
    A fluidised layer process for the production of anhydrous aluminium chloride 未知

    公开(公告)号：GB850440A

    公开(公告)日：1960-10-05

    申请号：GB439859

    申请日：1959-02-09

    Applicant: BASF AG

    Inventor： HILLE JOSEPH ,  DUERRWAECHTER WOLFGANG

    IPC: C01F7/58

    Abstract: Anhydrous aluminium chloride is produced by reacting gamma alumina with chlorine and carbon monoxide and/or with phosgene in the presence of an alkali-metal aluminium chloride melt, in a fluidised bed. The process is characterized in that the grain size distribution of the gamma alumina is such that the maximum percentages increse in volume from the state where no gas passes through the alumina to the point where the layer exhibits signs of "boiling" is between 40% and 55%, preferably between 45% and 50%. The major part by weight of the gamma alumina has a grain size of less than 60 microns. The gamma alumina may be a mixture of ground and unground particles. Specification 668,620 is referred to.

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