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US 5,994,252 AGranted
Process for producing spherical metal-oxide powder particles
AssigneeRW silicium GmbH
InventorsReinhard Feige, Friedhelm Bramsiepe
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Abstract
There is a process for producing spherical metal-oxide powder particles. They are used as finely ground raw and filler materials in mineral, ceramic and refractory construction, technical and auxiliary materials, as well as for polishing and grinding agents.
Claims12
Process for producing spherically shaped metal-oxide powder particles comprising the steps of
- (a) reducing aluminum oxide and at least one metal oxide selected from the group consisting of SiO.sub.2, MgO and CaO thermally and evaporating to produce evaporated products;
- (b) oxidizing the evaporated products by mixing with air or oxygen in a gas stream, and condensing as melt particles;
- (c) cooling the melt particles further in the gas stream and solidifying to form metal-oxide powder particles;
- and
- (d) separating the powder particles from the gas stream via a dust filter.
2 more elements
Dependencies are inferred from the claim text.