H.c. Starck Gmbh

H. C. Starck, Gmbh & Co Kg

H. C. Stack Gmbh & Co. Kg

H.c. Starck Surface Technology and Ceramic Powders Gmbh

Frank Schrumpf

Josef Schmoll

Matthias Jahn

Gerhard Gille

Viktor Stoller

Sven Albrecht

Armin Olbrich

Juliane Meese-marktscheffel

Gerd Maikowske

Michael Erb

Juliane Meese-Marktscheffel

Dirk Naumann

Astrid G&ouml;rge

Michael Lohse

Klaus-Jürgen Marschall

Uwe Kutzler

Stefan Zimmermann

Aloys Eiling

Michael Kruft

Astrid Gorge

Juliane Messe-Marktscheffel

Stefan Frässle

Jürgen Fischer

Thomas Schmidt

Roland Scholl

Michael Reiss

Michael Reiβ

Astrid Görge

Peter Thienel

Wolfgang Kiliani

The invention provides for a cermet powder containing

Metal powder

Process for the production of a powdered spherical tungstic acid by acidification of an aqueous alkaline tungstate solution with mineral acid at elevated temperature, preferably in a continuous stirred tank or a cascade of at least 2 continuous stirred tanks, and tungstic acid obtainable in this way, which is characterized by a high bulk density and spherical morphology.

Tungstic acid powder consisting of spherical tungsten particles and method for producing same

The invention is related to a boride of a metal of transition group four of the periodic table of the elements, wherein at least 40 wt. % of the particles have a grain size of more than 106 &#x3bc;m, determined by sieve analysis according to ASTM B 214, and these particles consist of grown, monocrystalline grains. The invention also relates to a cermet, wettable powder and a surface coating which contain the boride. The invention further relates to a process to prepare the boride. The invention additionally relates to a process to prepare a cermet or a wettable powder.

Inorganic compounds

The invention is directed to ammonium paratungstate decahydrate containing at least 75% of crystals having a length of at least 200 &#x3bc;m and having a ratio of length to width of less than 4.5:1.

Ammonium paratungstate hydrates and ammonium paratungstate decahydrate

The invention is directed to a process for the continuous preparation of ammonium paratungstate hydrate by back reextraction of a tungsten-laden organic phase with an ammonia-containing aqueous solution in a mixer-settler apparatus. The reextraction is carried out at an NH:W molar ratio of from 0.83 to 1.30, and a volume feed ratio of the tungsten-laden organic phase to the ammonia-containing aqueous solution of from 5 to 25. The above crystalline is in high purity and in high yield. The production method can be carried out in a simple and energy-efficient manner.

Method for producing ammonium paratungstate hydrates and ammonium paratungstate decahydrate

A process for preparing nickel hydroxide by alkaline precipitation from nickel salt solutions in the presence of complexing agents, in which the precipitation is carried out at at least two different locations in the same mother liquor with different precipitation kinetics at the different locations and the mother liquor is mixed prior to agglomeration of the precipitated primary crystals, is described.

Nickel hydroxide and method for producing same

The invention relates to a method for producing metal hydroxides or alkaline metal carbonates by anode dissolution of the corresponding metals and precipitation of the hydroxides or alkaline carbonates in an aqueous medium. The anode dissolution of the metal components is carried out in the anode compartment of a three-compartment electrolytic cell. An aqueous auxiliary salt solution is fed to an intermediate compartment that is disposed between the anode compartment and the cathode compartment and that is separated therefrom by a porous membrane. An at least not alkaline metal salt solution is continuously taken from the anode compartment while an alkaline auxiliary salt solution is continuously taken from the cathode compartment. The at least not alkaline metal salt solution and the alkaline auxiliary salt solution are combined outside the electrolytic cell for the purpose of precipitating metal hydroxides or alkaline metal carbonates.

Method for producing metal hydroxides or alkaline metal carbonates

A process is described for the production of spherical nickel hydroxide by anodic dissolution of a nickel electrode and precipitation of nickel hydroxide in a completely intermixed electrolysis cell, wherein an electrolysis brine is used which has a content of 20 to 50 g/l of chloride ions and 1 to 7 g/l of ammonia with a pH value of 9.5 to 11.5 and a temperature of 45 to 60&deg; C.

Method for producing nickel hydroxides

The present invention relates to basic cobalt(II) carbonate, agglomerated from fine primary particles and of general composition Co&lsqb;(OH) &rsqb; &lsqb;CO &rsqb; , where 0.1&lE;a&lE;0.9, and to spheroidal cobalt(II) hydroxide, to a process for producing them and to their use.

Spheroidally agglomerated basic cobalt(II) carbonate and spheroidally agglomerated cobalt(II) hydroxide, process for their production and their use

The present invention relates to cobalt(II) oxide containing metallic cobalt, to a process for the production thereof and to the use thereof.

Cobaltous oxide containing finely-dispersed metallic cobalt, methods of producing the same and use thereof

The present invention relates to processes for the production of cobalt(II) carbonates corresponding to the general formula Co&lsqb;(OH),&rsqb;,&lsqb;CO,&rsqb;,, cobalt(II) carbonates and cobalt(II) oxalate carbonates obtainable by the process and the use thereof.

Basic cobaltous carbonates, process for preparing the same and their use

Cobalt metal agglomerates, a method of producing them and their use

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Goslar, Germany

Frank Schrumpf