公开(公告)号：US20250034675A1

公开(公告)日：2025-01-30

申请号：US18225373

申请日：2023-07-24

Applicant: PAVEL KUDRYAVTSEV ,  Nikolai Kudriavtsev

Inventor： PAVEL KUDRYAVTSEV ,  Nikolai Kudriavtsev

IPC: C22B3/42 ,  B01J39/02 ,  B01J39/10 ,  C22B26/12

Abstract: A method of manufacturing an inorganic ion exchanger for the selective extraction of lithium from lithium-containing natural and technological brines is performed by interacting at least one soluble niobium(V) compound with an acid that contains at least one iron(III) compound, thus forming an electrolyte that contains a hydrated niobium(V) oxide and a hydrated iron(III) oxide, which co-precipitate and form a precipitate of a mixed hydrated niobium(V) and iron(III) oxide. The precipitate is washed, an excess of the electrolyte is removed, and the product is granulated with subsequent conversion into a lithium form, which is calcined and is converted to an H-form of the inorganic ion exchanger by treating thereof with an acid solution. the addition of Fe3+ ions contained in the iron(III) compound to the sorbent composition allows obtaining inorganic ion-exchange sorbents with a specific structure, which provides high selectivity, especially for lithium ions.

公开(公告)号：US20240123436A1

公开(公告)日：2024-04-18

申请号：US17956656

申请日：2022-09-29

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iiiya Kudryavtsev

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iiiya Kudryavtsev

IPC: B01J39/10 ,  B01J39/02 ,  B01J49/53 ,  C01D15/00 ,  C01G45/12 ,  C22B3/42 ,  C22B26/12

CPC classification number: B01J39/10 ,  B01J39/02 ,  B01J49/53 ,  C01D15/00 ,  C01G45/1221 ,  C22B3/42 ,  C22B26/12 ,  C01P2002/50

Abstract: The proposed method relates to producing inorganic sorbents for extracting lithium from lithium-containing natural and industrial brines. The method consists of a plurality of sequential steps, which include contacting a mixture of a soluble manganese (II) salt and aluminum (III) salt with an alkali solution in the presence of an alkali metal permanganate to obtain a precipitate of a mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide. After multiple reactions and conversions of intermediate products of the mixed hydrated manganese (III), manganese (IV), and aluminum (III) oxide, the final product is obtained as an ion exchanger in the H-form of high selectivity to lithium.

公开(公告)号：US20240035117A1

公开(公告)日：2024-02-01

申请号：US17877925

申请日：2022-07-30

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev

IPC: C22B26/12 ,  B01D15/36 ,  B01D15/18 ,  B01D15/20 ,  C22B7/00 ,  C22B3/42 ,  B01J47/02 ,  B01J49/06 ,  B01J49/53 ,  B01J49/60 ,  B01J47/14

CPC classification number: C22B26/12 ,  B01D15/362 ,  B01D15/1871 ,  B01D15/1885 ,  B01D15/203 ,  C22B7/006 ,  C22B3/42 ,  B01J47/02 ,  B01J49/06 ,  B01J49/53 ,  B01J49/60 ,  B01J47/14

Abstract: Provided are an apparatus and a method for ion-exchange extraction of lithium from natural or technological brine by using a lithium-selective inorganic sorbent operating on a principle of an ion sieve. The apparatus contains a plurality of ion-exchange columns arranged and interconnected in sequence. Flows of the brine, flush water, acidic desorption solution, and outputs, of the processed products are controlled via switchable shut-off valves. The method can be carried out by operating the apparatus in a parallel or a serial mode of column operations. In the parallel mode, all columns work simultaneously in the same manner. In the serial mode of operation, the columns work individually with a shift of the sorption-flushing-desorption-flushing cycles sequentially and with a transfer of the processed brined sequentially from the first column to the last column and from the last column to the first one thus providing continuity of the lithium-extraction process.

公开(公告)号：US20230278024A1

公开(公告)日：2023-09-07

申请号：US17688005

申请日：2022-03-07

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev

IPC: B01J45/00 ,  C22B3/42 ,  C22B26/12

CPC classification number: B01J45/00 ,  C22B3/42 ,  C22B26/12

Abstract: Proposed is a method of manufacturing an inorganic ion exchanger with improved selectivity for lithium. The exchanger is represented by the following general formula: HaNbO(2.5+0.5·a)·bLi2O·cWO3·dH2O, 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.

公开(公告)号：US20250161912A1

公开(公告)日：2025-05-22

申请号：US18517937

申请日：2023-11-22

Applicant: PAVEL KUDRYAVTSEV ,  Nikolai Kudriavtsev ,  Elena Eisurovich

Inventor： PAVEL KUDRYAVTSEV ,  Nikolai Kudriavtsev ,  Elena Eisurovich

IPC: B01J20/28 ,  B01J20/30

Abstract: Proposed is an apparatus for continuous wasteless production of a spherically granulated sorbent with a polymeric binder. The apparatus contains a first reactor for preparing a polymer solution in a water-miscible organic solvent and a second reactor that receives the polymer solution from the first reactor and is loaded with a ground inorganic sorbent together with solid, wetting, dispersing additives and a surfactant, whereby a suspension is formed. The suspension is dispersed into a bath filled with water, where drops of the suspension transform into spherical granules of a composite sorbent, the polymer solidifies, and the granules are sent to a water-filled tank to soak the granules and extract the remaining solvent, whereby a spherically granulated sorbent is obtained. The granules are then dried and unloaded into a receiving container. The apparatus is equipped with a system to recover byproducts and return them to the production process.

公开(公告)号：US20240157352A1

公开(公告)日：2024-05-16

申请号：US17979999

申请日：2022-11-03

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iliya Kudryavtsev

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iliya Kudryavtsev

IPC: B01J39/10 ,  B01J39/02 ,  B01J47/014 ,  C01G45/12

CPC classification number: B01J39/10 ,  B01J39/02 ,  B01J47/014 ,  C01G45/1221 ,  C01P2002/32 ,  C01P2002/50 ,  C01P2002/74 ,  C01P2004/60

Abstract: An inorganic sorbent for lithium extraction from lithium-containing natural and technological brines, which have low concentration of lithium. The sorbent has high selectivity for lithium in ion-exchange lithium-extraction processes and is expressed by the following general formula:


HxMnOy·zAl2O3·nH2O;

wherein:



“x” is a number ranging from 0.5 to 2.0,
“y” is a number ranging from 2.0 to 3.0,
“z” is a number ranging from 0.01 to 0.1, and
“n” is a number ranging from 1.0 to 2.0.

公开(公告)号：US20230278023A1

公开(公告)日：2023-09-07

申请号：US17688047

申请日：2022-03-07

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev

IPC: B01J39/10 ,  C22B26/12 ,  C22B3/42

CPC classification number: B01J39/10 ,  C22B26/12 ,  C22B3/42 ,  B01J2523/56 ,  B01J2523/69

Abstract: 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:


HaNbO(2.5+0.5·a)·bL2O·cWO3·dH2O;

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.

公开(公告)号：US11260366B2

公开(公告)日：2022-03-01

申请号：US16504191

申请日：2019-07-05

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iliya Kudryavtsev

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iliya Kudryavtsev

IPC: B01J20/30 ,  B01J20/08

Abstract: The invention provides a method of obtaining inorganic sorbents for extraction of lithium from lithium-containing natural and technological brines. The method consists of steps of obtaining six consecutive non-stoichiometric compound, wherein at the final step the sixth non-stoichiometric compound is obtained by converting the fifth non-stoichiometric compound into a hydrogen-form of inorganic ion-exchanger by treating the fifth non-stoichiometric compound with an acid solution. The method improves selectivity and exchangeability of sorbents to lithium based on manganese oxides, as well as chemical stability of the sorbents in cyclic operations.

公开(公告)号：US20190184373A1

公开(公告)日：2019-06-20

申请号：US15841760

申请日：2017-12-14

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Joseph Kristul

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Joseph Kristul

IPC: B01J20/30 ,  B01J20/04 ,  B01J20/06 ,  B01J20/02

CPC classification number: B01J20/3028 ,  B01J20/0211 ,  B01J20/0214 ,  B01J20/04 ,  B01J20/06 ,  B01J20/3078 ,  B01J20/3085 ,  B01J39/10 ,  C02F1/42

Abstract: Proposed is a method of obtaining inorganic sorbents for extracting lithium from lithium-containing natural and technological brines. The method is carried by contacting a soluble niobate (V) with an acid in the presence of at least one zirconium (IV) salt to obtain a precipitate of a mixed hydrated niobium and zirconium oxide. Subsequent steps include granulating the precipitate by freezing, converting the product of granulation into a Li-form, calcining the Li-form, and converting the obtained granulated mixed lithium, niobium, and zirconium oxide into an ion-exchanger in an H-form. In the obtained H-form the inorganic sorbent is ready for use in lithium extraction processes.

公开(公告)号：US11179715B2

公开(公告)日：2021-11-23

申请号：US16274812

申请日：2019-02-13

Applicant: Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iliya Kudryavtsev

Inventor： Pavel Kudryavtsev ,  Nikolai Kudriavtsev ,  Iliya Kudryavtsev

IPC: B01J39/09 ,  B01J39/02

Abstract: Proposed is an inorganic ion-exchanger, which is selective to lithium and constituted a non-stoichiometric compound in the form of solid particles of a polymeric aqua-oxo-hydroxo complex represented by the following general formula: HaNbO(2.5+0.5·a).cZrO2.dH2O, wherein: “a” is a number ranging from 0.5 to 1.5, “c” is a number ranging from 0.01 to 1.0, and “d” is a number ranging from 0.1 to 2.0. The complex has a total ion exchange capacity of at least 3.5 meq/g and an ion-exchange capacity specifically to lithium of at least 2.5 meq/g. This ion-exchanger is intended for selective extraction of lithium from lithium-containing natural and industrial brines.