Lithium adsorption-desorption apparatus and lithium adsorption-desorption method using the same

Patent metadata

Field	Value
Publication number	US-2020010927-A1
Application number	US-201916503698-A
Country	US
Kind code	A1
Filing date	Jul 5, 2019
Priority date	Jul 6, 2018
Publication date	Jan 9, 2020
Grant date	—

Abstract

The invention relates to a lithium adsorption-desorption apparatus including a plurality of reaction tanks arranged in a row; a guide rail disposed at an upper portion of the reaction tank; a movable driving unit coupled to a moving means that moves along the guide rail; and a reaction housing which is mounted to the driving unit, and can be vertically moved or rotated in a state in which the lithium adsorbent is fixed thereto, and after immersing in the reaction tank, accelerates adsorption or desorption of lithium, and after being lifted, discharges residual solution from the lithium adsorbent by rotation movement.
Therefore, the lithium adsorption desorption apparatus can fix a large amount of lithium adsorbent and immerse it in a lithium-containing solution to effectively adsorb lithium and then quickly desorb lithium in a desorption solution, and can efficiently wash the lithium adsorbent in a cleaning solution.

First claim

What is claimed is:

1 . A lithium adsorption-desorption apparatus comprising,
a plurality of reaction tanks arranged in a row; a guide rail disposed at an upper portion of the reaction tank; a movable driving unit coupled to a moving means that moves along the guide rail; and a reaction housing which is mounted to the driving unit, and can be vertically moved or rotated in a state in which the lithium adsorbent is fixed thereto, and after immersing in the reaction tank, accelerates adsorption or desorption of lithium, and after being lifted, discharges residual solution from the lithium adsorbent by rotation movement.

2 . The apparatus of claim 1 , wherein the driving unit comprises,
a chain coupled to the moving means; a base plate which is connected to a chain to be vertically movable and is provided with a motor; an actuator which is disposed on one side of the base plate and vertically moves the motor; and a drive shaft which is coupled to the motor to rotate the reaction housing.

3 . A lithium adsorption-desorption apparatus comprising,
a lithium supply portion where a lithium solution tank filled with a lithium-containing solution is disposed; a reaction portion which is disposed on one side of the lithium supply portion, and is provided with a plurality of cleaning baths and desorption baths therein; a guide rail placed on a plurality of frames extending from an edge of the lithium supply portion and the reaction portion; a driving unit coupled to a moving means that is movable along the guide rail; a reaction housing which is mounted to the driving unit, and can be vertically moved or rotated in a state in which a lithium adsorbent is fixed, such that after being immersed in the lithium solution tank to adsorb lithium or after being immersed and agitated in the cleaning bath or desorption bath to wash the lithium adsorbent or desorb lithium, respectively, is lifted vertically to discharge residual solution from the lithium adsorbent by centrifugal force generated by the rotation; and a control unit disposed on one side of the reaction portion to control movement of the moving means and the driving unit.

4 . The apparatus of claim 3 , wherein the lithium-containing solution is one selected from the group consisting of seawater, brine, geothermal water, and lithium waste solution.

5 . The apparatus of claim 3 , wherein the plurality of cleaning baths and desorption baths are arranged such that the cleaning baths filled with cleaning solution and desorption baths filled with an acidic aqueous solution are alternately arranged in a row.

6 . The apparatus of claim 5 , wherein the desorption bath is provided with a lithium concentration tank on one side, which receives and stores a desorption solution concentrated by lithium desorption.

7 . The apparatus of claim 3 , wherein the guide rail is spaced apart from the upper portion of the lithium supply portion and the reaction portion so that the driving unit coupled to the moving means is located at an upper portion of the lithium solution tank, the cleaning bath, or the desorption bath.

8 . The apparatus of claim 3 , wherein the driving unit comprises,
a base plate attached to the upper portion of the cleaning bath or the desorption bath to prevent the cleaning solution or the desorption solution filled inside from flowing out of the cleaning bath or the desorption bath, a motor disposed on one side of the base plate, a drive shaft penetrating the base plate, with one end coupled to the motor and the other end coupled to the reaction housing to rotate the reaction housing, a plurality of linear actuators disposed on one side of the base plate for moving the motor vertically, and an outer frame extending from one side of the base plate that can be coupled with a chain of the moving means.

9 . The apparatus of claim 3 , wherein the driving unit vertically moves the reaction housing downward to be immersed in the lithium solution tank or the desorption bath and rotates in one direction or the other direction to accelerate adsorption or desorption of lithium for the lithium adsorbent fixed to the reaction housing,
and the driving unit vertically moves the reaction housing upwards and rotates at a predetermined speed in one direction or the other direction to discharge all the lithium-containing solution or desorption solution remaining inside the pores inside the lithium adsorbent to the outside of the lithium adsorbent.

10 . The apparatus of claim 3 , wherein the reaction housing comprises,
a housing frame connected to a drive shaft on one side, a support shelf coupled to the housing frame for supporting and fixing the lithium adsorbent, and a housing mesh surrounding the outer peripheral surface of the frame and is formed of a corrosion-resistant material through which a lithium-containing solution, a cleaning solution or a desorption solution passes.

11 . The apparatus of claim 10 , wherein a sliding door or a door fixed by a hinge is provided on one side of the housing frame so that one side is open and the lithium adsorbent can be loaded into the support shelf.

12 . The apparatus of claim 3 , wherein the lithium adsorbent, is formed by attaching delithiated manganese oxide to a porous carrier to adsorb lithium in the lithium-containing solution and desorb lithium in an acidic aqueous solution, and
the lithium adsorbent is formed in a block form so as to be fixed to the reaction housing.

13 . The apparatus of claim 3 , wherein an edge portion is disposed along one surface along the outer circumference of the lithium supply portion and the reaction portion, and a safety rail is provided at an upper portion of the edge portion.

14 . The apparatus of claim 3 , wherein a work table is disposed in the reaction portion, and the table is mounted to a rail provided at an edge of the reaction portion to be movable inside the reaction portion.

15 . A lithium adsorption-desorption method using a lithium adsorption-desorption apparatus, comprising,
(a) preparing a lithium adsorbent and mounting it on a reaction housing; (b) immersing the reaction housing in a lithium solution tank and rotating the reaction housing to accelerate lithium adsorption; (c) lifting the lithium adsorbent adsorbed with lithium together with the reaction housing to immerse in a cleaning bath filled with a cleaning solution and rotating the reaction housing to wash the lithium adsorbent; (d) immersing the washed lithium adsorbent in a desorption bath filled with a desorption solution and rotating the reaction housing to desorb lithium: (e) lifting the lithium desorbed lithium adsorbent and rotating the same to remove residual desorption solution by centrifugal force; and (f) recovering the desorption solution which contains lithium for separation and storage.

16 . The method of claim 15 , further comprising,
after said step (e), confirming whether the lithium adsorbent is damaged or contaminated, and replacing the lithium adsorbent in the reaction housing if the lithium adsorbent is damaged or contaminated, or returning to said step (b) for re-adsorbing lithium.

Assignees

• Korea Inst Geoscience & Mineral Resources

Inventors

• Chung Kang-Sup
• Kim Byoung-Gyu

Classifications

• C02F2101/10

  Inorganic compounds · CPC title

• C02F2303/16

  Regeneration of sorbents, filters · CPC title

• C02F2103/08

  Seawater, e.g. for desalination · CPC title

• C02F1/28 Primary

  by sorption (using ion-exchange C02F1/42; sorbent compositions B01J) · CPC title

• C02F1/283 Primary

  using coal, charred products, or inorganic mixtures containing them · CPC title