Preparation of granulated alkaline earth metal carbonate
AssigneeSolvay Barium Strontium GmbH
InventorsDieter Goldmann, Ludwig Pfeifer, Karl Koehler, Peter Wallbrecht, Norbert Mingels
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Abstract
A method for preparing granulated alkaline earth metal carbonate, particularly barium carbonate or strontium carbonate, by adding a binding agent and optionally water; granulating the resulting mixture, preferably in the presence of water; drying the granular product; and optionally subjecting the granular product to a high-temperature treatment, in which the material to be granulated and the granulated material do not contact any inorganic refractory material during the granulation, during subsequent drying, and during any high-temperature treatment.
Claims8
A method for preparing granulated calcium carbonate, barium carbonate or strontium carbonate, comprising the steps of:
- granulating an alkaline earth metal carbonate selected from the group consisting of calcium carbonate, barium carbonate and strontium carbonate in the presence of water and a binding agent, wherein said water is present in an amount up to 17 wt.-% based on the dry weight of the alkaline earth metal carbonate and said binding agent is present in an amount of from 1 to 5 wt.-% based on the dry weight of the alkaline earth metal carbonate;
- and
- subsequently drying the granulated alkaline earth metal carbonate in a separate drying step at a temperature of from 100.degree. to 250 .degree. C.;
- and
- wherein said alkaline earth metal carbonate is maintained out of contact with inorganic refractory materials during and after said granulating step and said drying step.
Dependencies are inferred from the claim text.