Orbite Technologies Inc.

Aem Technologies Inc.

Hubert Dumont

Richard Boudreault

Marie-Maxime Labrecque-Gilbert

Joël Fournier

Denis Primeau

Jean-François Samuel

Jonathan Bouffard

Sophie Lepage

Ann-Christine Huard

Claudia Gravel-Rouleau

There are provided processes for purifying aluminum ions. Such processes comprise precipitating the aluminum ions under the form of Al(OH)at a first pH range; converting Al(OH)into AlClby reacting Al(OH)with HCl and precipitating said AlCl; and heating the AlClunder conditions effective for converting AlClinto AlOand optionally recovering gaseous HCl so-produced. The processes can also comprise converting alumina into aluminum.

Methods for purifying aluminium ions

The disclosed processes can be effective for treating various materials comprising several different metals. These materials can be leached with HCl for obtaining a leachate and a solid. Then, they can be separated from one another and a first metal can be isolated from the leachate. Then, a second metal can further be isolated from the leachate. The first and second metals can each be substantially selectively isolated from the leachate. This can be done by controlling the temperature of the leachate, adjusting pH, further reacting the leachate with HCl, etc. The metals that can be recovered in the form of metal chlorides can eventually be converted into the corresponding metal oxides, thereby allowing for recovering HCl. The various metals can be chosen from aluminum, iron, zinc, copper, gold, silver, molybdenum, cobalt, magnesium, lithium, manganese, nickel, palladium, platinum, thorium, phosphorus, uranium, titanium, rare earth element and rare metals.

Processes for preparing alumina and magnesium chloride by HCl leaching of various materials

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Laval, Canada

Hubert Dumont