GRINDING STABILIZING ADDITIVE FOR VERTICAL ROLLER MILLS

    公开(公告)号:US20210122675A1

    公开(公告)日:2021-04-29

    申请号:US16959627

    申请日:2018-06-15

    Abstract: Method for grinding a solid in a vertical roller mill (VRM) and a cement composition prepared by the disclosed methods. A method comprises grinding a solid comprising a cement clinker under a water spray in the presence of a grinding stabilizing additive, wherein the grinding stabilizing additive comprises: (i) an alkanol amino acid compound or a disodium or dipotassium salt thereof having the structural formula: (I), (ii) a glycol; or a mixture of (i) and (ii), wherein the water spray level is reduced by at least 5% compared to a control. Cement compositions prepared by the disclosed methods have the pre-hydration level (Wk) equal to or less than 1.5%. The values and preferred values of R1-3 are disclosed herein.

    POLYACRYLIC ACID GRINDING AID FOR ENHANCED CEMENT POWDER FLOWABILITY

    公开(公告)号:US20240208862A1

    公开(公告)日:2024-06-27

    申请号:US18390613

    申请日:2023-12-20

    CPC classification number: C04B7/52 C04B16/04 C04B2103/50

    Abstract: A method for grinding cement clinker particles, comprising: introducing to a composition comprising dry cement clinker particles, in a ball mill or roller mill, whereby said particles are ground to have a finer average particle size, an aqueous grinding additive composition comprising: from about 0.1 to about 15% by weight of at least one polyacrylic acid or a salt thereof; and water; and grinding the dry composition comprising the cement clinker particles and the aqueous grinding additive composition to produce a cement product having a pack set index (PSI) greater than that obtained when the polyacrylic acid is not present in the grinding additive.

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