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US 12,692,170 B2Granted
Process for the preparation of pure lithium oxide
AssigneeAlbemarle Germany GmbH
InventorsUlrich Wietelmann, Ahmet Karaca, Johannes Klösener, Mary Schäder, Holger Schwerin, Henrike Rempel, Katrin Wessels, Rolf Sanders, Alexander Hübner
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Abstract
The invention relates to a process for the production of pure lithium oxide and its use, wherein lithium carbonate is reacted with finely divided, elemental carbon in powder form in the temperature range between 600 and 1200° C., wherein the two reactants are intensively premixed prior to the thermolysis process so that the bulk density of the mixture is reduced by at least 5%, preferably by at least 15%.
Claims19
A process for the production of lithium oxide from
- lithium carbonate with a median particle size (D50) between 2 and 150 μm, determined by laser diffraction, and
- elemental carbon in powder form with a median primary particle size (D50) of <1 μm, determined by electron microscopy,
- with calcination in a temperature range between 60° and 1200° C.,
- characterized in that
- prior to the calcination the lithium carbonate and the carbon are combined in a molar ratio of 1:0.1 to 1:1.2 and are mixed and compacted, whereby the carbon particles surround the lithium carbonate particles and form a coating and a bulk density of a resulting mixture is increased by at least 5% compared to a bulk density of a mixture of the lithium carbonate particles and the carbon particles prepared without compaction, the bulk density being determined according to EN ISO 697.
2 more elements
Dependencies are inferred from the claim text.