Abstract: There are provided processes for preparing alumina. These processes can comprise leaching an aluminum-containing material with HCl so as to obtain a leachate comprising aluminum ions and a solid, and separating said solid from said leachate; reacting said leachate with HCl so as to obtain a liquid and a precipitate comprising said aluminum ions in the form of AlCl3, and separating said precipitate from said liquid; and heating said precipitate under conditions effective for converting AlCl3 into Al2O3 and optionally recovering gaseous HCl so-produced. These processes can also be used for preparing various other products such as hematite, MgO, silica and oxides of various metals, sulphates and chlorides of various metals, as well as rare earth elements, rare metals and aluminum.
Type:
Grant
Filed:
September 17, 2012
Date of Patent:
July 5, 2016
Assignee:
Orbite Technologies Inc.
Inventors:
Richard Boudreault, Joël Fournier, Denis Primeau, Marie-Maxime Labrecque-Gilbert
Abstract: There are provided processes for treating fly ash. For example, the processes can comprise leaching fly ash with HCl so as to obtain a leachate comprising aluminum ions and a solid, and separating the solid from the leachate; reacting the leachate with HCl so as to obtain a liquid and a precipitate comprising the aluminum ions in the form of AlCl3, and separating the precipitate from the liquid; and heating the precipitate under conditions effective for converting AlCl3 into Al2O3 and optionally recovering gaseous HCl so-produced.
Type:
Grant
Filed:
March 11, 2013
Date of Patent:
November 10, 2015
Assignee:
Orbite Technologies Inc.
Inventors:
Richard Boudreault, Joël Fournier, Denis Primeau