Methods for purifying aluminium ions
AssigneeOrbite Technologies Inc.
InventorsRichard Boudreault, Joël Fournier, Hubert Dumont, Jean-François Samuel, Jonathan Bouffard, Sophie Lepage, Ann-Christine Huard, Claudia Gravel-Rouleau, Marie-Maxime Labrecque-Gilbert
Life of this patent
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Abstract
There are provided processes for purifying aluminum ions. Such processes comprise precipitating the aluminum ions under the form of Al(OH)3 at a first pH range; converting Al(OH)3 into AlCl3 by reacting Al(OH)3 with HCl and precipitating said AlCl3; and heating the AlCl3 under conditions effective for converting AlCl3 into Al2O3 and optionally recovering gaseous HCl so-produced. The processes can also comprise converting alumina into aluminum.
Claims20
A process for purifying aluminum ions comprising:
- leaching an aluminum containing material chosen from an aluminum-containing ore, a recycled industrial aluminum-containing material, red mud, fly ashes, slag, alumina, aluminum hydroxide, aluminum chloride and aluminum metal with an acid so as to obtain a leachate comprising said aluminum ions and ions from at least one metal;
- and optionally a solid residue;
- optionally separating the leachate from the solid residue;
- precipitating said aluminum ions from said leachate in the form of Al(OH)3 at a pH of about 7 to about 10 in order to obtain a solid comprising said Al(OH)3 and a liquid comprising said ions from said at least one metal;
- separating said solid from said liquid;
- converting said Al(OH)3 into AlCl3 by reacting Al(OH)3 with HCl and precipitating said AlCl3;
- recovering said AlCl3;
- and
- heating said AlCl3 under conditions effective for converting AlCl3 into Al2O3 and optionally recovering gaseous HCl so-produced.
A process for purifying aluminum ions comprising:
- leaching an aluminum containing material chosen from an aluminum-containing ore, a recycled industrial aluminum-containing material, red mud, fly ashes, slag, alumina, aluminum hydroxide, aluminum chloride and aluminum metal with an acid so as to obtain a leachate comprising said aluminum ions and ions from at least one metal;
- and optionally a solid residue;
- optionally separating the leachate from the solid residue;
- precipitating said aluminum ions from said leachate in the form of Al(OH)3 at a pH of about 7 to about 10 in order to obtain a solid comprising said Al(OH)3 and a liquid comprising said ions from said at least one metal;
- separating said solid from said liquid;
- converting said Al(OH)3 into AlCl3 by reacting Al(OH)3 with HCl and precipitating said AlCl3;
- recovering said AlCl3;
- heating said AlCl3 under conditions effective for converting AlCl3 into Al2O3 and optionally recovering gaseous HCl so-produced;
- and
- converting said Al2O3 into aluminum.
Dependencies are inferred from the claim text.