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US 2012/0237418 A1Published application
Processes for extracting aluminum from aluminous ores
AssigneeOrsite Aluminae Inc.
InventorsRichard BOUDREAULT, Serge ALEX, Fabienne BIASOTTO
Life of this patent
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Abstract
There are provided processes for extracting aluminum ions from aluminous ores and for preparing alumina. Such processes can be used with various types of aluminous ores such as aluminous ores comprising various types of metals such as Fe, K, Mg, Na, Ca, Mn, Ba, Zn, Li, Sr, V, Ni, Cr, Pb, Cu, Co, Sb, As, B, Sn, Be, Mo, or mixtures thereof.
Claims20
A process for preparing alumina comprising:
- leaching an aluminous ore with an acid so as to obtain a leachate and a solid residue, and separating said leachate from said solid residue;
- removing at least a portion of iron ions contained in said leachate by reacting said leachate with a base in order to obtain a pH of at least 10 and substantially selectively precipitating said at least a portion of said iron ions and separating said precipitated at least a portion of said iron ions from said leachate so as to obtain an Al-rich composition;
- purifying said Al-rich composition;
- and
- converting said purified Al-rich composition into alumina.
2 more elements
A process for preparing alumina comprising:
- leaching an aluminous ore with an acid so as to obtain a leachate and a solid residue, and separating said leachate from said solid residue;
- at least partially removing iron ions from said leachate by substantially selectively precipitating said iron ions at a pH greater than 10 by reacting said leachate with a base and at least partially removing said precipitated iron ions from said leachate, thereby obtaining an Al-rich composition comprising Al3+ ions;
- purifying said Al3+ ions;
- and
- converting said Al3+ ions into alumina.
2 more elements
A process for extracting aluminum ions from an aluminous ore, said process comprising:
- leaching said aluminous ore with an acid and obtaining a composition comprising aluminum ions and iron ions;
- at least partially removing said iron ions from said composition by substantially selectively precipitating said iron ions at a pH of at least 10 by reacting said composition with a base and at least partially removing said precipitated iron ions, thereby obtaining an Al-rich composition comprising Al3+ ions;
- and
- purifying said Al3+ ions.
1 more element
A process for extracting aluminum ions from argillite, said process comprising:
- leaching said argillite with HCl so as to obtain a composition comprising a leachate and a solid residue;
- separating said leachate and said solid residue from one another;
- at least partially removing iron from said leachate by substantially selectively precipitating iron ions by reacting said leachate with a base and removing a so-formed precipitate, so as to obtain an Al-rich composition comprising Al3+ ions;
- and
- purifying said Al3+ ions by substantially selectively precipitating said Al3+ ions.
2 more elements
Dependencies are inferred from the claim text.