리튬함유 폐액으로부터 D2EHPA에 의한 리튬의 회수

Abstract

Abstract A study on the solvent extraction for the recovery of Li from lithium-containing waste solution was investigated usingD 2 EHPA as an extractant. The experimental parameters, such as the pH of the aqueous solution, concentration of extractant andphase ratio were observed. Experimental results showed that the extraction percentage of Li was increased with increasing theequilibrium pH. More than 50% of Li was extracted in eq. pH 6.0 by 20% D 2 EHPA. From the analysis of McCabe-Thiele dia-gram, 95% of Li was extracted by four extraction stage at phase ratio(O/A) of 3.0. Stripping of Li from the loaded organic phasescan be accomplished by sulfuric acid as a stripping reagent and 90 ~ 120 g/L of H 2 SO 4 was effective for the stripping of Li.Finially, Li was concentrated about 11.85 g/L by continuous stripping process, and then lithium carbonate was prepared by pre-cipitation method.Key words : Solvent extraction, D 2 EHPA, Lithium, Lithium carbonate · Received : July 10, 2014 · Revised : August 22, 2014 · Accepted : September 4, 2014Corresponding Author : Jae-woo Ahn (E-mail : jwahn@daejin.ac.kr)Advanced Materials Science & Engineering, Daejin University, Hoguk-ro 1007, Pocheon-si, Gyeonggi-do 487-711, KoreaTel : +82-31-539-1982 / Fax : +82-31-539-1980ⓒThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the termsof the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permitsunrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.