Selective-cation-removal purification of aluminum source
AssigneeEEStor, Inc.
InventorLucas Pettey
Life of this patent
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Abstract
A method of purifying an aluminum source includes dissolving an aluminum ion source to provide a first solution including aluminum ions having a pH of not greater than 4.0, adjusting the pH of the first solution with a tetraalkylammonium hydroxide solution to a pH in range of 4.1 to 8.4 thereby forming an aluminum hydroxide precipitate, separating the aluminum hydroxide precipitate from the first solution, washing the separated aluminum hydroxide precipitate with an aqueous solution having a pH in a range of 4.1 to 8.4, dissolving the washed aluminum hydroxide precipitate using an acid to provide a second solution having a pH of not greater than 4.0, and forming an aluminum salt from the second solution.
Claims23
A method of purifying an aluminum source, the method comprising:
- dissolving an aluminum ion source to provide a first solution including aluminum ions having a pH of not greater than 4.0;
- adjusting the pH of the first solution with a tetraalkylammonium hydroxide solution to a pH in range of 4.1 to 8.4 thereby forming an aluminum hydroxide precipitate;
- separating the aluminum hydroxide precipitate from the first solution;
- washing the separated aluminum hydroxide precipitate with an aqueous solution having a pH in a range of 4.1 to 8.4;
- dissolving the washed aluminum hydroxide precipitate using an acid to provide a second solution having a pH of not greater than 4.0;
- and
- forming an aluminum salt from the second solution.
A method of purifying an aluminum source, the method comprising:
- adjusting the pH of a first solution including aluminum ions and having a pH of not greater than 4.0 with a tetraalkylammonium hydroxide solution to a pH in a range of 4.1 to 8.4, thereby forming an aluminum hydroxide precipitate;
- washing the aluminum hydroxide precipitate with an aqueous solution having a pH in a range of 4.1 to 8.4 and an alkali metal concentration of not greater than 1 ppm;
- and
- dissolving the washed aluminum hydroxide precipitate using an acid to provide a second solution having a pH of not greater than 4.0, the second solution having an alkali metal concentration of not greater than 1 ppm.
A method of purifying an aluminum source, the method comprising:
- precipitating an aluminum hydroxide precipitate from a first solution including an aluminum ion source and having a pH of not greater than 4.0 by adding a tetraalkylammonium hydroxide solution to adjust the first solution pH to in a range of 4.1 to 8.4;
- separating the aluminum hydroxide precipitate from the first solution;
- washing the aluminum hydroxide precipitate with an aqueous solution having a pH in a range of 4.1 to 8.4 and an alkali metal concentration of not greater than 1 ppm;
- and
- dissolving the washed aluminum hydroxide precipitate using an acid to provide a second solution having a pH of not greater than 4.0, the second solution having an alkali metal concentration of not greater than 1 ppm.
Dependencies are inferred from the claim text.