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A method for extracting lithium by a split adsorption device

An adsorption device and a technology for extracting lithium, which are applied in separation methods, filtration separation, chemical instruments and methods, etc., can solve the problems of improving desorption efficiency and ineffectiveness, and achieve shortening elution time, accelerating migration rate, and improving desorption rate effect

Active Publication Date: 2021-08-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The installation of the filter has no effect on the desorption process and the improvement of the desorption efficiency

Method used

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  • A method for extracting lithium by a split adsorption device
  • A method for extracting lithium by a split adsorption device
  • A method for extracting lithium by a split adsorption device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A lithium adsorbent with a particle size of 40 mesh is added to the adsorption column through the adsorbent addition port 3. The adsorption solution is the original brine of a lithium-containing magnesium sulfate subtype salt lake. The solution flows through the adsorption column at a flow rate of 200mL / h through the fluid inlet 1. , after 2 hours of adsorption, the liquid inlet is stopped, and water is added to the fluid inlet 1 to quickly wash the adsorbent, and then desorption is performed. Water enters from the fluid inlet 1, flows through the cylinder at a flow rate of 200mL / h, connects an external DC power supply through conductive screws between the conductive support net 5 and the conductive support net 14, and fixes the sealing ring coaxially to ensure that the fluid does not leak . The power supply voltage is 5V, wherein the conductive support net 5 is connected to the negative pole of the power supply, and the conductive support net 14 is connected to the pos...

Embodiment 2

[0048] A lithium adsorbent with a particle size of 50 mesh is added to the adsorption column through the adsorbent addition port 3. The adsorption solution is a chloride-type lithium-containing brine of a certain potassium salt segment. The solution flows through the adsorption column at a flow rate of 200mL / h through the fluid inlet 1. , after 2 hours of adsorption, the liquid inlet is stopped, and water is added to the fluid inlet 1 to quickly wash the adsorbent, and then desorption is performed. Water enters from the fluid inlet 1, flows through the cylinder at a flow rate of 200mL / h, and connects an external DC power supply through conductive screws between the conductive support net 5 and the conductive support net 14, and fixes the sealing ring coaxially to ensure that the fluid does not leak . The power supply voltage is 8V, wherein the conductive support net 5 is connected to the negative pole of the power supply, and the conductive support net 14 is connected to the p...

Embodiment 3

[0050] Add a lithium adsorbent with a particle size of 5 mesh to the attached column through the adsorbent addition port 3. The adsorption solution is the chloride-type salt lake old brine diluted twice. The solution flows through the adsorption at a flow rate of 200mL / h through the fluid inlet 1 After 2 hours of adsorption, stop feeding the column, add water through fluid inlet 1 to quickly wash the adsorbent, and then perform desorption. Water enters from the fluid inlet 1, flows through the cylinder at a flow rate of 200mL / h, connects an external DC power supply through conductive screws between the conductive support net 5 and the conductive support net 14, and fixes the sealing ring coaxially to ensure that the fluid does not leak . The power supply voltage is 12V, wherein the conductive support net 5 is connected to the negative pole of the power supply, and the conductive support net 14 is connected to the positive pole of the power supply, wherein the lower surface of ...

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Abstract

The invention discloses a method for extracting lithium through a split-type adsorption device, comprising: adding an adsorbent to the split-type adsorption device, making a lithium-containing solution flow through the split-type adsorption device, at least part of the lithium-containing solution Lithium ions are adsorbed by the adsorbent; water is made to flow through the segmented adsorption device to desorb the lithium ions in the adsorbent. The invention utilizes a segmented adsorption device to extract lithium from lithium-containing salt lake brine, which can effectively improve the elution rate of lithium, greatly shorten elution time, and save water consumption. The desorption is assisted by an external electric field, and the desorption lasts for 2-4 hours, and the desorption rate of lithium is between 85-92%. Compared with no electric field, the desorption efficiency of the adsorbent to lithium increased by 5-15% after the desorption continued for 2-4 hours. The time for obtaining the same extraction rate of lithium is shortened by 4‑8h through the assisted desorption by an external electric field.

Description

technical field [0001] The invention relates to the technical field of separation of inorganic metal ions, in particular to a method for extracting lithium from salt lake brine through a segmented adsorption device capable of applying an electric field. Background technique [0002] my country's salt lakes are rich in salt resources such as potassium, magnesium, lithium, and boron, with huge potential economic value. Only in the salt lakes of Qinghai Province, B 2 o 3 Reserves of 11.525 million tons, LiCl reserves of 13.886 million tons, SrSO 4 The reserves are 15.895 million tons, 181.3 thousand tons of liquid bromine ore, 7.8 thousand tons of liquid iodine ore, 38 thousand tons of liquid rubidium ore and certain liquid cesium ore resources. The adsorption method is applicable to the development of boron, lithium, iodine, bromine, rubidium, cesium, strontium and other resources. Seawater also contains certain bromine, iodine, lithium, strontium and other elements, espec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/34C02F101/10
CPCB01J20/3441C02F1/28C02F2101/10
Inventor 郭敏刘忠吴志坚李权葛飞
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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