Omya International Ag

Omya Gmbh

Omya Development Ag

Bahman Tavakkoli

Thomas Mangelberger

Matthias Reisinger

Michael Pohl

Jörg Sötemann

Thomas Schmölzer

Matthias Buri

Jörg Maier

Joerg Maier

The present invention relates to a process for the preparation of precipitated calcium carbonate comprising the steps of a) providing and calcining calcium carbonate comprising material; b) slaking the reaction product obtained from step a) with an aqueous ammonium chloride solution; c) separating insoluble components from the calcium chloride solution obtained from step b); d) carbonating the calcium chloride solution obtained from step c); e) separating the precipitated calcium carbonate obtained from step d); the precipitated calcium carbonate obtained by this process, as well as uses thereof.

Production of high purity precipitated calcium carbonate

The present invention relates to a method for separating mineral impurities from calcium carbonate-containing rocks by comminuting the calcium carbonate-containing rocks to a particle size in the range of from 1 mm to 250 mm, separating the calcium carbonate particles by means of a dual energy X-ray transmission sorting device.

Method for separating mineral impurities from calcium carbonate-containing rocks by X-ray sorting

The invention concerns a process for purification of calcium carbonate-comprising minerals comprising at least one flotation step, characterized in that this step implements at least one quaternary imidazoline methosulfate compound as collector agent.

Process of purification of minerals based on calcium carbonate by flotation in the presence of quaternary imidazolium methosulfate

The invention relates to a method for manufacturing dispersed mineral products by grinding the mineral raw material, sizing the same in a flow classifier, sorting the same in dispersion in air, and climinating the dispersion air. Also disclosed are devices and installations for carrying out said method. In prior art, mineral raw materials cannot be purified or are purified very inefficiently such that only very pure and high-quality starting raw materials, which are available in limited quantifies only, can be used for manufacturing high-quality dispersed mineral products, especially fillers. The aim of the invention is therefore to create a method for manufacturing dispersed mineral products, particularly fillers, in a dry process as well as devices for carrying out said method. Said aim is achieved by triboelectrically charging the dispersed mineral particles of the particle-air dispersion during the sizing process and directing the same through an electrostatic separation chamber in order to separate the foreign particles from the valuable particles.

Method and device for manufacturing dispersed mineral products

The invention relates to a method for manufacturing dispersed mineral products by grinding the mineral raw material, sizing the same in a flow classifier, sorting the same in dispersion in air, and eliminating the dispersion air. Also disclosed are devices and installations for carrying out said method.

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Puch, Austria

Bahman Tavakkoli