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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：DE59208939D1

    公开(公告)日：1997-11-06

    申请号：DE59208939

    申请日：1992-01-25

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMITT PETER DR ,  BIRTIGH GERHARD ,  ZETZMANN KLAUS DR

    IPC: B22D41/46 ,  C04B35/653 ,  C21B7/14 ,  F27B14/06 ,  F27D3/14 ,  F27D3/15 ,  F27D25/00 ,  H05B6/24 ,  F27D23/02

    Abstract: A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In tile method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products. A device for periodic melt broaching as well as an induction melting furnace equipped with an intensively coolable run-out channel provides apparatus for carrying out the above method.

    3.
    发明专利
    未知

    公开(公告)号：BR9200699A

    公开(公告)日：1992-11-10

    申请号：BR9200699

    申请日：1992-02-28

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMIT PETER DR

    IPC: B22D41/46 ,  C04B35/653 ,  C21B7/14 ,  F27B14/06 ,  F27D3/14 ,  F27D3/15 ,  F27D25/00 ,  H05B6/24 ,  C04B35/64

    Abstract: A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In tile method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products. A device for periodic melt broaching as well as an induction melting furnace equipped with an intensively coolable run-out channel provides apparatus for carrying out the above method.

    4.
    发明专利
    未知

    公开(公告)号：BR9200697A

    公开(公告)日：1992-11-10

    申请号：BR9200697

    申请日：1992-02-28

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMIT PETER DR

    IPC: C01G25/02 ,  C04B35/486 ,  C09C1/28 ,  C04B35/48

    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.

    5.
    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.

    7.
    发明专利
    未知

    公开(公告)号：DE4106537A1

    公开(公告)日：1992-09-03

    申请号：DE4106537

    申请日：1991-03-01

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMIT PETER DR ,  BIRTIGH GERHARD ,  ZETZMANN KLAUS DR

    IPC: B22D41/46 ,  C04B35/653 ,  C21B7/14 ,  F27B14/06 ,  F27D3/14 ,  F27D3/15 ,  F27D25/00 ,  H05B6/24

    Abstract: A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In tile method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products. A device for periodic melt broaching as well as an induction melting furnace equipped with an intensively coolable run-out channel provides apparatus for carrying out the above method.

    9.
    发明专利
    未知

    公开(公告)号：ES2108051T3

    公开(公告)日：1997-12-16

    申请号：ES92101204

    申请日：1992-01-25

    Applicant: DEGUSSA

    Inventor： BINDER DIETER DR ,  KLEINSCHMITT PETER DR ,  BIRTIGH GERHARD ,  ZETZMANN KLAUS DR

    IPC: B22D41/46 ,  C04B35/653 ,  C21B7/14 ,  F27B14/06 ,  F27D3/14 ,  F27D3/15 ,  F27D25/00 ,  H05B6/24 ,  F27D23/02

    Abstract: A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In tile method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products. A device for periodic melt broaching as well as an induction melting furnace equipped with an intensively coolable run-out channel provides apparatus for carrying out the above method.

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