H.c. Starck Gmbh

H. C. Starck, Gmbh & Co Kg

Hermann C. Starck Gmbh & Co. Kg

Gerhard Gille

Prabhat Kumar

Armin Olbrich

Juliane Meese-Marktscheffel

Viktor Stoller

Bernd Mende

Benno Gries

Frank Schrumpf

Josef Schmoll

Dirk Naumann

Michael Erb

Wolfgang Mathy

Ines Lamprecht

Sven Albrecht

Matthias Jahn

Ulrich Krynitz

Brad Lemon

Michael Kruft

Astrid Gorge

Gerd Maikowske

Jörg Bredthauer

Astrid Görge

J&ouml;rg M&uuml;nchow

Peter Aulich

Mario Salvadori

James Daily

The invention relates to novel pre-alloyed metal powders a method for production and use thereof.

Metal powder

Process for the electrochemical decomposition of precursors in powder form by introducing a powder batch between two electrodes of an electrolysis cell, electrodes being designed to be liquid-permeable, and the electrolyte flowing through the powder batch perpendicularly to the electrode surfaces, and electrolysis cell suitable therefor, which is essentially characterized in that at least one electrode has a structure which consists of a supporting pierced plate (), an electrode plate () provided with perforations, and a filter cloth () arranged between the supporting pierced plate () and the electrode plate (), and in that the cathode () is shielded from the cell by means of a liquid-permeable separator ().

Process for the electrochemical decomposition of powders and electrolysis cells suitable therefor

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

A process for reducing the content of alkali metal impurities (e.g., potassium) in ammonium metallate solutions is described. The process involves subjecting a feed solution containing ammonium metallate and alkali metal impurities to membrane filtration. The membrane filtration results in the formation of a retentate having a reduced level alkali metal relative to the feed solution, and a permeate containing substantially the balance of alkali metal. The permeate may also be further treated, to remove alkali metal there from, by passage through a cation exchange column, thereby forming a cation exchange treated permeate that may be combined with the retentate of the membrane filtration step.

Purification of ammonium metallate solutions

The invention relates to a method for producing wolfram carbides by gas-phase carburetion of wolfram powders and/or suitable wolfram precursor compounds in powder form at temperatures above 850&#xb0; C. According to the method a CO/CO mixture with a COcontent greater than the Boudouard equilibrium content corresponding to the carburetion temperature is used as carburetion gas phase.

Method for producing tungsten carbides by gas-phase carburization

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 preparation of powder mixtures or composite powders from at least one first type of powder from the group consisting of high-melting metals, hard materials and ceramic powders and at least one second type of powder from the group consisting of binder metals, binder-metal mixed crystals and binder-metal alloys, where the second type of powder is formed from precursor compounds in the form of water-soluble salts in an aqueous suspension of the first type of powder by precipitation as oxalate, removal of the mother liquor and reduction to the metal.

Powder mixture or composite powder, a method for production thereof and the use thereof in composite materials

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

A process is described for the production of metal powder and alloy powders containing at least one of the metals iron, copper, tin, cobalt or nickel, by mixing aqueous metal salt solutions with an aqueous carboxylic acid solution, separating the precipitation product from the mother liquor and reducing the precipitation product to the metal.

Pre-alloyed powder

Cobalt/cobalt oxide powder having the composition Co.sub.x (CoO).sub.1-x, where x is from 0.02 to 5, and a process for its production and use in nickel hydroxide electrodes for secondary batteries to enhance capacity.

Cobalt/cobalt oxide powder

This invention relates to submicron carbonitride powders of titanium and, optionally, other transition metals of the fifth (Me.sup.(5)) and sixth (Me.sup.(6)) secondary group of the periodic system of elements which have the following general molar composition: (Ti.sub.L Me.sub.M.sup.(5) Me.sup.(6).sub.1-L-M) (C.sub.1-y N.sub.y).sub.z with 0.50.ltoreq.L.ltoreq.1; 0.ltoreq.m.ltoreq.0.15; 0.ltoreq.(1-L-M).ltoreq.0.50; 0.10.ltoreq.y.ltoreq.0.95 and z.gtoreq.0.90, to a process for the production of these powders and to their use.

Growing community of inventors

Goslar, Germany

Gerhard Gille