2.
    发明专利
    未知

    公开(公告)号:DK224580A

    公开(公告)日:1980-11-24

    申请号:DK224580

    申请日:1980-05-22

    Applicant: HOECHST AG

    Abstract: 1. Use of calcium sulfate for dehydrating waste water sludge, characterized in that acid waste gypsum such as that which is obtained by subjecting phosphate ores to processing treatment with sulfuric acid for the preparation of phosphoric acid, is used.

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