2.
    发明专利
    未知

    公开(公告)号:FI916079A0

    公开(公告)日:1991-12-20

    申请号:FI916079

    申请日:1991-12-20

    Applicant: DEGUSSA

    Abstract: A layer of air-placed concrete or a ready-mixed concrete is produced by using, as mixing water, an aqueous suspension of a synthetically produced silica, for example a precipitated silica.

    5.
    发明专利
    未知

    公开(公告)号:DE3867693D1

    公开(公告)日:1992-02-27

    申请号:DE3867693

    申请日:1988-02-23

    Applicant: DEGUSSA

    Abstract: The method continuously meters powdery material using compressed gas, the supply of the latter to a double or multiple pipe via a branch pipe being alternately interrupted and the branch pipe filled with the material. The latter is then further transported by the gas. There can be a stop valve for the gas in each branch pipe, followed by a non-return valve. The stop valves are connected to a silo for the material and a vent pipe.

    DEVICE FOR EMPTYING CONTAINERS FILLED WITH POWDERS

    公开(公告)号:CA1171121A

    公开(公告)日:1984-07-17

    申请号:CA370299

    申请日:1981-02-06

    Applicant: DEGUSSA

    Abstract: Powders having a relatively low powder density can be emptied from transportation containers only with dust formation on an undesired large scale. The device for emptying containers filled with powders of the invention comprises a vacuum pipe, a fluidization device disposed thereon adjacent the open end of said pipe. This fluidization device may have the shape of a double cone shell disposed concentrically around the pipe or of a hollow sphere disposed concentrically around the pipe. The fluidizing air can be passed into the powder through boreholes disposed in the direction of the opening of the pipe. In order to prevent the vacuum pipe from becoming attached to the container wall by suction, the opening of the vacuum pipe has castellated rims.

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