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    1.
    发明专利
    未知

    公开(公告)号：ES2085498T3

    公开(公告)日：1996-06-01

    申请号：ES92101115

    申请日：1992-01-24

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMIT PETER DR ,  HOFFMEISTER HANS DR ,  REUTER ROLAND

    IPC: C01G25/02 ,  C04B35/486

    Abstract: The invention relates to monoclinic zirconium oxide having an SiO2 content of less than 1% by weight, which is characterised by dendrite-shaped particles having a mean grain size (d50 value) in the range from 0.5 mu m to 3.0 mu m and a specific surface area (BET) in the range from 3 to 15 m /g. The zirconium oxide is prepared by thermal cracking of zirconium silicate in a high-frequency or medium-frequency inductive fusion furnace with a sinter crust crucible, quenching of the melt by blowing air onto a melt jet and/or spraying the latter with water and leaching the thermally cracked zirconium silicate with concentrated alkali metal hydroxide solution at 100 to 200 DEG C. The zirconium oxides according to the invention is distinguished from prior zirconium oxide by its improved suitability for the production of zirconium silicate colouring materials of the host lattice and inclusion types - pigments of higher colour intensity are obtained.

    2.
    发明专利
    未知

    公开(公告)号：DE4106535A1

    公开(公告)日：1992-09-03

    申请号：DE4106535

    申请日：1991-03-01

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMITT PETER DR ,  HOFFMEISTER HANS DR ,  REUTER ROLAND

    IPC: C01G25/02 ,  C04B35/486

    Abstract: The invention relates to monoclinic zirconium oxide having an SiO2 content of less than 1% by weight, which is characterised by dendrite-shaped particles having a mean grain size (d50 value) in the range from 0.5 mu m to 3.0 mu m and a specific surface area (BET) in the range from 3 to 15 m /g. The zirconium oxide is prepared by thermal cracking of zirconium silicate in a high-frequency or medium-frequency inductive fusion furnace with a sinter crust crucible, quenching of the melt by blowing air onto a melt jet and/or spraying the latter with water and leaching the thermally cracked zirconium silicate with concentrated alkali metal hydroxide solution at 100 to 200 DEG C. The zirconium oxides according to the invention is distinguished from prior zirconium oxide by its improved suitability for the production of zirconium silicate colouring materials of the host lattice and inclusion types - pigments of higher colour intensity are obtained.

    6.
    发明专利
    未知

    公开(公告)号：DE59205715D1

    公开(公告)日：1996-04-25

    申请号：DE59205715

    申请日：1992-01-24

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMIT PETER DR ,  HOFFMEISTER HANS DR ,  REUTER ROLAND

    IPC: C01G25/02 ,  C04B35/486

    Abstract: The invention relates to monoclinic zirconium oxide having an SiO2 content of less than 1% by weight, which is characterised by dendrite-shaped particles having a mean grain size (d50 value) in the range from 0.5 mu m to 3.0 mu m and a specific surface area (BET) in the range from 3 to 15 m /g. The zirconium oxide is prepared by thermal cracking of zirconium silicate in a high-frequency or medium-frequency inductive fusion furnace with a sinter crust crucible, quenching of the melt by blowing air onto a melt jet and/or spraying the latter with water and leaching the thermally cracked zirconium silicate with concentrated alkali metal hydroxide solution at 100 to 200 DEG C. The zirconium oxides according to the invention is distinguished from prior zirconium oxide by its improved suitability for the production of zirconium silicate colouring materials of the host lattice and inclusion types - pigments of higher colour intensity are obtained.

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