Process for recovering materials from bauxite residue, microwave reactor for heating mining products and method for heating a mining product
AssigneeNew Wave Royalties Sociedad Anonima
InventorLucas Arantes Araújo
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Abstract
This invention refers to a technically and economically viable process for recovery of relevant metallic and non-metallic contents from mining residues, particularly the bauxite residue, using it in its integral form. Such a process route uses energy from microwaves, assisted leaching and logic sequencing of steps that allow a technically and economically viable removal of components from the bauxite residue, particularly the residue from the Bayer process. The invention also refers to a microwave reactor that is appropriate for performing the above-mentioned process, as well as to a method for heating a mining product.
Claims2
Method for recovering materials derived from bauxite residue, the method comprising the steps of:
- mixing (100) the bauxite residue with a reducing agent to obtain a residue mixture;
- heating (110) the residue mixture in a microwave reactor (1) to obtain a reduced bauxite residue;
- performing a first milling iteration (120) on the reduced bauxite residue;
- performing a size separation (111) of the bauxite residue after the first milling iteration (120) to obtain a coarse portion (Gr) and a fine portion (Fi) of residue;
- performing magnetic separation (130) on the coarse portion (Gr) of residue to obtain a first magnetic portion (Mag. I) and a first non-magnetic portion (N. Mag. I);
- performing a second milling iteration (121) on the fine portion (Fi) of residue;
- performing magnetic separation (131) on the fine portion (Fi) of ground residue to obtain a second magnetic portion (Mag. II) and a second non-magnetic portion (N. Mag II);
- leaching (140), with sulfuric acid, the portion of non-magnetic material (N.Man I+II) obtained to obtain silica (SiO2);
- stirring (150) a leaching by-product of the leaching (140) with the addition of caustic soda to obtain titanium dioxide (TiO2);
- evaporating (160) an agitation by-product of the stirring (150) to obtain effluent (ETE);
- and
- calcinating (170) an evaporation by-product of the evaporating (160) to obtain Alumina (Al2O3).
Dependencies are inferred from the claim text.