The present disclosure relates to processes for recovering rare earth elements from various materials. The processes can comprise leaching the at least one material with at least one acid so as to obtain a leachate comprising at least one metal ion and at least one rare earth element, and a solid, and separating the leachate from the solid. ... Orbite Aluminae Inc
There are provided processes for treating red mud. For example, the processes can comprise leaching red mud with hcl so as to obtain a leachate comprising ions of a first metal (for example aluminum) and a solid, and separating said solid from said leachate. ... Orbite Aluminae Inc
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. ... Orbite Aluminae Inc