A lithium ion sorbent includes an organosilane-grafted lithium ion sieve. The organosilane-grafted lithium ion sieve is a reaction product of a lithium ion sieve and an organosilane. The lithium ion sieve is either a delithiated orthosilicate or a delithiated metal oxide. The organosilane reagent is of the general formula: R.sup.1—(CH.sub.2).sub.n—Si—R.sup.4.sub.3 where R.sup.1 is an organic moiety containing a functional group selected from an acrylate, methacrylate or vinyl group or their derivatives, R.sup.4 is either a hydrolysable alkoxy group or a methyl group, where at least one of the three R.sup.4 groups is a hydrolysable alkoxy group and n is 1-3. This lithium ion sorbent is durable and useful for adsorbing lithium from aqueous resources. The lithium ion sorbent can also be used in the manufacture of a composite material where the organosilane-grafted lithium ion sieve is covalently incorporated into a porous crosslinked polymeric support scaffold.

Provided is a method for producing a lithium-containing solution that prevents the dissolution of the whole lithium manganese oxide while maintaining the efficiency of an elution step. The method for producing a lithium-containing solution comprises performing an adsorption step of contacting a lithium adsorbent obtained from lithium manganese oxide with a low lithium-containing liquid for adsorption to give post-adsorption lithium manganese oxide, an elution step of contacting the post-adsorption lithium manganese oxide with an acid solution to give a lithium-containing solution with residual manganese, and a manganese oxidation step of oxidating manganese to give a lithium-containing solution with a suppressed manganese concentration, performed in this order. The acid solution is a 0.5 mol/L or more and 4.0 mol/L or less hydrochloric acid solution. According to the production method, in the elution step, the dissolution of the whole lithium manganese oxide can be suppressed while maintaining the efficiency of exchange reaction between cations including Li.sup.+ and H.sup.+. Thus, the repeated use of the lithium adsorbent becomes possible.

Proposed is a method of manufacturing an inorganic ion exchanger with improved selectivity for lithium. The exchanger is represented by the following general formula: H.sub.aNbO.sub.(2.5+0.5.Math.a).Math.bLi.sub.2O.Math.cWO.sub.3.Math.dH.sub.2O, wherein “a” is a number ranging from 0.5 to 2.0, “b” is a number ranging from 0.01 to 0.5, “c” is a number ranging from 0.01 to 0.2, and “d” is a number ranging from 0.1 to 2.0. The method consists of: interacting a soluble niobate (V) with an acid to form a hydrated niobium (V) oxide and a hydrated tungsten (VI) oxide, which co-precipitate and form a mixed hydrated niobium (V) and tungsten (VI) oxide; granulating the obtained product; converting the granulated product into a lithium form; calcining the lithium form to obtain a mixed granulated tripled lithium, niobium (V) and tungsten (VI) oxide, and converting the lithium-form into an H-form of the inorganic ion-exchanger by treating it with an acid solution.

The invention relates to lithium-selective inorganic ion exchangers for the extraction of lithium from lithium-containing natural and technological brines. More specifically, invention relates to a technology for recovering lithium in the presence of oxidizing or reducing agents. The inorganic ion-exchanger is present in the form of solid particles which are represented by a chemical non-stoichiometric compound in the form of an inorganic polymeric aqua-oxo-hydroxo complex intended for selective extraction of lithium from lithium-containing natural and industrial brines, the inorganic ion-exchanger being represented by the following general formula:

H.sub.aNbO.sub.(2.5+0.5.Math.a).Math.bL.sub.2O.Math.cWO.sub.3.Math.dH.sub.2O;

wherein: “a” is a number ranging from 0.5 to 2.0, “b” is a number ranging from 0.01 to 0.5, “c” is a number ranging from 0.01 to 0.2, and “d” is a number ranging from 0.1 to 2.0.

The invention relates to lithium-selective inorganic ion exchangers for the extraction of lithium from lithium-containing natural and technological brines. More specifically, invention relates to a technology for recovering lithium in the presence of oxidizing or reducing agents. The inorganic ion-exchanger is present in the form of solid particles which are represented by a chemical non-stoichiometric compound in the form of an inorganic polymeric aqua-oxo-hydroxo complex intended for selective extraction of lithium from lithium-containing natural and industrial brines, the inorganic ion-exchanger being represented by the following general formula:

H.sub.aNbO.sub.(2.5+0.5.Math.a).Math.bL.sub.2O.Math.cWO.sub.3.Math.dH.sub.2O;

wherein: “a” is a number ranging from 0.5 to 2.0, “b” is a number ranging from 0.01 to 0.5, “c” is a number ranging from 0.01 to 0.2, and “d” is a number ranging from 0.1 to 2.0.

The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from minerals, and recycled products.

The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from minerals, and recycled products.

Compositions and methods of preparing sorbent compositions (SCs) and protonated sorbent compositions (PSCs) for use in concentrating lithium from native brines are described. In particular, SCs of the general formula Li.sub.1.3-1.6Mn.sub.1.6-1.7O.sub.4, methods of preparing the SCs and PSCs that have improved properties for lithium extraction and concentration over single and multiple cycles are described.

Compositions and methods of preparing sorbent compositions (SCs) and protonated sorbent compositions (PSCs) for use in concentrating lithium from native brines are described. In particular, SCs of the general formula Li.sub.1.3-1.6Mn.sub.1.6-1.7O.sub.4, methods of preparing the SCs and PSCs that have improved properties for lithium extraction and concentration over single and multiple cycles are described.

The present disclosure relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products.