| CPC B01J 39/10 (2013.01) [B01J 39/02 (2013.01); B01J 49/53 (2017.01); C01D 15/00 (2013.01); C01G 45/1221 (2013.01); C22B 3/42 (2013.01); C22B 26/12 (2013.01); C01P 2002/50 (2013.01)] | 20 Claims |
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1. A method for obtaining an inorganic sorbent for extraction of lithium from a lithium-containing brine, the method comprising:
contacting a mixture of at least one soluble manganese (II) salt in an aqueous solution and at least one aluminum (III) salt in an aqueous solution with an alkali solution in a reaction container in a mother solution in the presence of an alkali metal permanganate to obtain a precipitate of a mixed hydrated manganese (III), manganese (IV), and aluminum (oxide, which comprises a non-stoichiometric compound;
washing the obtained precipitate by decanting with deionized water to a certain content in the mother solution of the at least one alkali metal salt;
discontinuing the decanting and settling the precipitate in the reaction container to a predetermined level;
removing a transparent part of the mother solution to obtain a precipitate suspension in a residue of the mother solution;
transferring the obtained precipitate of the precipitate suspension in the residue of the mother solution to a freezer container and freezing the precipitate to a solid frozen state for obtaining a mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide in an icy granular form having a surface;
removing at least one alkali metal salt from the surface of the icy granular form;
thawing the mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide to form a resulting granulated mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide and thawing the mother solution to form a thawed mother solution;
separating the icy granular form from an excess of the thawed mother solution;
converting the resulting granulated mixed hydrated manganese manganese (IV), and aluminum (III) oxide into an H-form of the granulated mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide by treating thereof with a solution of an acid;
converting the H-form of the granulated mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide into a Li-form of the granulated mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide by treating thereof with a solution of a lithium-containing compound;
drying and calcining the Li-form of the granulated mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide to obtain a dehydrated granulated mixed manganese (III), manganese (IV), and aluminum (III) oxide, which contains in its composition four oxides and comprises a lithium-form of an inorganic ion-exchanger; and
converting the obtained lithium-form of an inorganic ion exchanger into an H-form of the ion-exchanger by treating thereof with an acid solution.
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