Recovery of lithium from simulated secondary resources using combination technique of solvent extraction and electrodialysis

Name: Pattamart Waengwan

keyword: Acidic extractant

; Electrodialysis

; Extraction efficiency

; Selectivity

; Solvent extraction

Abstract: Lithium extraction is currently too inefficient to be economical or marketable. The objective of this work was to study the separation mechanism involved in lithium recovery from spent battery leachate via the combination of solvent extraction and an electrodialysis technique. The first step was to determine the best extractant and the most inexpensive approach to recover lithium chemically from lithium-ion batteries from a solution containing another desired metal. The Li2CO3 solution was used to represent leachate solution from a spent battery. The extraction efficiency of various extracting types was investigated. The highest level of efficiency for extracting lithium ions from aqueous solution was obtained with bis(2-ethylhexyl) phosphate (DEHPA), with 75% recovery. By studying the effects of selected extractants in this experiment, it was found that the acidic extractant group provided a better extraction efficiency than solvating extractants. Influential variables, including extraction time, pH of aqueous solution, and initial concentration were investigated further. The results indicate that 6 h of extraction brings the system to equilibrium, and pH 1.5 provides the best extraction efficiency. Another experiment was performed to determine the membrane efficiency using a Nafion membrane series without potential. It was found that the membrane from an extrusion melt process (Nafion117, Nafion115) achieved a higher level of efficiency than a membrane from a solution casting process (Nafion211, Nafion212). The highest level of efficiency was 52%, and this was achieved with the Nafion117 membrane. Then, the electrodialysis experiment was set up. This was done on a small scale with about 150 mL of Li2CO3 and 150 mL of DEHPA. The influences of the applied voltage and equilibrium separation were investigated. The greatest efficiency, 50%, was obtained with 0.8 V and the Nafion117 membrane. Separation began after 10 min and reached equilibrium after 30 min. There was a significant decrease in the time taken, from 32 h to 30 min, when the electrodialysis experiment was conducted as compared with a condition where no potential was applied

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Tippapust Eksangsri

Role: advisor

Created: 2020

Modified: 2023-02-24

Issued: 2023-02-24

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2020.1169

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Engineering

Grantor: Thammasat University

©copyrights Thammasat University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	10691pattamart.pdf	5.04 MB	1	2025-04-18 09:05:46

ใช้เวลา

0.031145 วินาที