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    31.
    发明专利
    未知

    公开(公告)号：NO20053293L

    公开(公告)日：2005-09-16

    申请号：NO20053293

    申请日：2005-07-05

    Applicant: OUTOKUMPU OY

    Inventor： STRODER MICHAEL ,  STOCKHAUSEN WERNER ,  NUBER DIRK

    IPC: B01J8/00 ,  B01J8/18 ,  C04B11/028 ,  F27B15/02 ,  F27B15/10 ,  F27B15/16

    Abstract: The present invention relates to a method for the heat treatment of fine-grained solids, in particular gypsum, in which the solids are heated to a temperature of 50 to 1000° C. in a fluidized bed reactor (1), and to a corresponding plant. To improve the energy utilization, it is proposed to introduce a first gas or gas mixture from below through a preferably central gas supply tube (3) into a mixing chamber (21) of the reactor (1), the gas supply tube (3) being at least partly surrounded by a stationary annular fluidized bed (2) which is fluidized by supplying fluidizing gas, and to adjust the gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed (2) such that the particle Froude numbers in the gas supply tube (3) are between 1 and 100, in the annular fluidized bed (2) between 0.02 and 2 and in the mixing chamber (21) between 0.3 and 30.

    35.
    发明专利
    未知

    公开(公告)号：DE10336676A1

    公开(公告)日：2005-03-17

    申请号：DE10336676

    申请日：2003-08-09

    Applicant: OUTOKUMPU OY

    Inventor： SNEYD STUART ,  HIRSCH MARTIN ,  NUBER DIRK

    IPC: C21B13/00 ,  C22B1/248 ,  C22B5/14 ,  C22B5/18 ,  C21B13/14 ,  C22B1/10

    Abstract: This invention relates to a process for reducing solids containing iron oxide, such as iron ore, in which fine-grained solids are heated and at least partly calcined in a pre-heating stage ( 2, 9 ). In a first fluidized-bed reactor ( 14 ) downstream of the preheating stage ( 2, 9 ), the solids are prereduced and reduced further in a second fluidized-bed reactor ( 16 ). Downstream of the second reactor ( 16 ) a briquetting stage ( 20 ) is provided, in which the solids are briquetted at a temperature above 500 ° C. To increase the energy efficiency of the process and improve the flowability of the solids in the briquetting stage ( 20 ), magnesite is added to the preheating stage ( 2, 9 ) together with the solids containing iron oxide, which magnesite is at least partly calcined in the preheating stage ( 2, 9 ) to obtain magnesium oxide. Furthermore, the invention relates to a corresponding plant.

    36.
    发明专利
    未知

    公开(公告)号：DE10260741A1

    公开(公告)日：2004-07-08

    申请号：DE10260741

    申请日：2002-12-23

    Applicant: OUTOKUMPU OY

    Inventor： NUBER DIRK ,  STOCKHAUSEN WERNER ,  STROEDER MICHAEL

    IPC: B01J8/00 ,  B01J8/18 ,  C04B11/028 ,  F27B15/02 ,  F27B15/10 ,  F27B15/16 ,  B01J8/24

    Abstract: The present invention relates to a method for the heat treatment of fine-grained solids, in particular gypsum, in which the solids are heated to a temperature of 50 to 1000° C. in a fluidized bed reactor (1), and to a corresponding plant. To improve the energy utilization, it is proposed to introduce a first gas or gas mixture from below through a preferably central gas supply tube (3) into a mixing chamber (21) of the reactor (1), the gas supply tube (3) being at least partly surrounded by a stationary annular fluidized bed (2) which is fluidized by supplying fluidizing gas, and to adjust the gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed (2) such that the particle Froude numbers in the gas supply tube (3) are between 1 and 100, in the annular fluidized bed (2) between 0.02 and 2 and in the mixing chamber (21) between 0.3 and 30.

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