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.

公开(公告)号：DK0439695T3

公开(公告)日：1993-12-27

申请号：DK90121041

申请日：1990-11-02

Applicant: DEGUSSA

Inventor： SPEER DIETRICH DR ,  KISS AKOS DR ,  KLEINSCHMITT PETER DR

IPC: C01G49/00 ,  C09C1/00 ,  C09C1/22 ,  C09C1/28

Abstract: Inclusion pigments (I) are based on Zr silicate (II) as shell substance, in which coloured cpds. (Fe1-xMnx)2O3 of formula (III) are enclosed as discrete phase and are mixed crystals. In (III) x is 0.05-0.60. Pref. (Fe,Mn) zeolites are used as (III). Esp. x is 0.05-0.20 or 0.30-0.60. (I) are prepd. by calcining a mixt. of ZrO2 and SiO2 or their precursors in 1:1 molar ratio for 0.5-8 hrs. at 750-1200 deg.C in the presence of mineralisers and Fe and Mn cpds. or cpds. contg. Fe and Mn with an Fe/Mn atomic ratio of 90:10 to 20:80. Pref. calcination temp. is 850-1000 deg.C for an Fe/Mn ratio of 50:50-80:20 and 1050-1200 deg.C for an Fe/Mn ratio of 50:50-30:70. Unincluded Mn and Fe cpds. are removed by treating the calcined prod. with acid.

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.

公开(公告)号：DE4108624A1

公开(公告)日：1992-09-17

申请号：DE4108624

申请日：1991-03-16

Applicant: DEGUSSA

Inventor： SPEER DIETRICH DR ,  KISS AKOS DR ,  KLEINSCHMITT PETER DR ,  HORST JENNY ,  ZELL CHRISTEL

IPC: C09C1/34 ,  C01B33/00 ,  C04B35/26 ,  C04B35/48 ,  C09C1/00

Abstract: The invention relates to occlusion pigments based on zirconium silicate as the covering substance and chromium(III) oxide as a discretely occluded coloured compound. The occluded Cr2O3 has a D50 value of 0.1 to 3.0 mu m and is a brilliant light green. Compared with non-occluded Cr2O3 having the same D50 value, the pigments according to the invention can be used without trouble for the production of decorations. They are also suitable for direct printing and high-temperature firing-on processes. The pigments are produced by calcining a mixture of zirconium dioxide, silicon dioxide, mineralisers and chromium oxide.

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.

公开(公告)号：DE3925356A1

公开(公告)日：1991-02-07

申请号：DE3925356

申请日：1989-07-31

Applicant: DEGUSSA

Inventor： DESCHLER ULRICH DR ,  PANSTER PETER DR ,  KLEINSCHMITT PETER DR

IPC: C07F7/10 ,  C07F7/18

Abstract: N,N'-disubstituted or N,N,N'- or N,N',N'-trisubstituted thioureas with additional organyloxysilyl function and tertiary amine function of the general formula These compounds are prepared as follows: a) Aminoorganylsilanes of the general formula are reacted in an organic, inert solvent with carbon disulfide, b) The dithiocarbamates formed thereby having the general formula: are isolated and combined with at least the equimolar amount of an amino compound of the general formula H2N-(CH2)n-NR32, this mixture is heated until the reaction is completed and the desired product is subsequently isolated.

公开(公告)号：DE2318652A1

公开(公告)日：1974-11-07

申请号：DE2318652

申请日：1973-04-13

Applicant: DEGUSSA

Inventor： DITTRICH GUNTHER DR ,  KLEINSCHMITT PETER DR ,  MANNSFELD SVEN-PETER DR ,  SCHMIDT FELIX DR ,  WAGNER ADOLF

IPC: A62D3/32 ,  A62D101/26 ,  A62D101/45 ,  C02F9/00 ,  C21D1/46 ,  C23C8/40 ,  A62D3/00

Abstract: Pollution by waste from melts used in hardening, carburising and nitriding steel, and from heat-treatment melts contg. alkali nitrite/nitrate, is prevented by common destruction of (1) cyanides, cyanates and complex cyanides (I)and of (2) nitrates and nitrites (II). Powdery mixts contg (I) and (II) are reacted with one another, in molten or sinter sintered conditions, using a wt. ratio (II):(I)>2.1(>4), and reducing excess (II) by reaction with C or C-contg. substances in molten phase. Mixts of powdered salts are heated at least to formation of melt, partic. when C is added after reaction of (I) and (II), or powdered salts contg. (I) or (II) may be introduced into stirred melt of the other cpd gp. Reduction with C may be effected also during reaction of salt mixts. esp. at 50 degrees C above their melting temp.