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    Process for the stagewise fluidized bed roasting of sulfidic iron minerals
    13.
    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.

    Production of pure concentrated sulfuric acid
    20.
    发明专利
    Production of pure concentrated sulfuric acid 未知

    公开(公告)号：GB1010554A

    公开(公告)日：1965-11-17

    申请号：GB3380462

    申请日：1962-09-04

    Applicant: BASF AG

    Inventor： KLINGER WILLI ,  WOLF HERBERT

    IPC: C01B17/88 ,  C01B17/90

    Abstract: Pure concentrated H2SO4 is prepared by introducing gaseous SO2 and water into the lower and upper parts respectively of a column, the central portion of which contains packing, whereby a layer of boiling 97-98.3% H2SO4 is formed in the central portion; and removing part of the reaction heat by supplying excess water, allowing excess to vapourize, condense at the top of the column, and be returned to the boiling H2SO4. The remaining reaction heat is removed by product H2SO4, which is passed through a de-aerator and cooler. Temperatures of 320-333 DEG C. can be maintained under normal pressure. Up to 10% of an inert gas, e.g. air or N2, may be mixed with the SO3, and escapes at the top of the column with any SO2. Parts of the column which come into contact with H2SO4 are made of, or lined with, quartz or noble metals.

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