Process for making high purity aluminum oxide
AssigneePolar Sapphire Ltd.
InventorScott Nichol
Life of this patent
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Abstract
A method comprising contacting high-purity acid, high-purity aluminum, and high-purity water to form a first solution in a heated non-contaminating vessel, wherein the aluminum is employed in at least a stoichiometric amount relative to the acid, heating the first solution in a non-contaminating container, to provide a mother liquor and solid aluminum salts, separating the solid aluminum salts from the mother liquor, heating the solid aluminum salts in a non-contaminating crucible, to provide alpha aluminum oxide, and, optionally, washing the alpha aluminum oxide with high-purity water after some or all of the heating of the solid aluminum salts to provide the alpha aluminum oxide.
Claims21
A method comprising:
- (a) in a heated non-contaminating vessel, contacting high-purity acid, high-purity aluminum and high-purity water to form a first solution, wherein the high-purity aluminum is employed in at least a stoichiometric amount relative to the acid;
- (b) in a non-contaminating container, heating the first solution, to provide a mother liquor and solid aluminum salts;
- (c) separating the solid aluminum salts from the mother liquor;
- (d) in a non-contaminating crucible, heating the solid aluminum salts, to provide alpha aluminum oxide;
- and
- (e) optionally washing the alpha aluminum oxide with high-purity water after some or all of the heating of step (d) to provide a washed alpha aluminum oxide, wherein one or both of the alpha aluminum oxide provided by the heating of step (d) or the washed alpha aluminum oxide provided by the washing of step (e) is at least about 99.99 wt % pure aluminum oxide.
A method comprising:
- (a) contacting high-purity acid, high-purity aluminum, and high-purity water in a non-contaminating vessel to form a first solution;
- (b) at least one of heating and gas injecting the first solution, to provide a mother liquor and solid aluminum salts;
- (c) separating the solid aluminum salts from the mother liquor;
- (d) heating the solid aluminum salts, to provide alpha aluminum oxide;
- and
- (e) washing the alpha aluminum oxide, to provide washed alpha aluminum oxide,
- wherein one or both of the alpha aluminum oxide provided by the heating of step (d) or the washed alpha aluminum oxide provided by the washing of step (e) is at least about 99.99 wt % pure aluminum oxide.
Dependencies are inferred from the claim text.