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US 12,415,731 B1Granted
Methods for purifying graphite
AssigneeWestwater Resources, Inc.
InventorCevat W. Er
Life of this patent
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Abstract
The invention relates to methods for purifying graphite comprising the steps of caustic roasting, acid leaching, and thermal treatment.
Claims10
A method of obtaining purified graphite from a natural flake graphite concentrate or spheroidized graphite, comprising the steps of:
- caustic roasting the graphite concentrate sample or spheroidized graphite to react silicon to form water soluble compounds and to provide a roasted graphite in a furnace;
- caustic leaching the roasted graphite to remove silica;
- washing and filtering the roasted graphite;
- acid leaching the roasted graphite to remove iron compounds and metal hydroxides;
- caustic leaching the roasted graphite to remove impurities;
- acid leaching the roasted graphite to remove iron compounds and metal hydroxides;
- washing and filtering the roasted graphite;
- drying the roasted graphite;
- thermally treating the roasted graphite to remove silicon, iron, sodium, and sulfur resulting in the purified graphite.
6 more elements
Dependencies are inferred from the claim text.