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The separation of In from the synthesis solution with Ga, Fe, and Al has been studied by the solvent extraction using D2EHPA as an extractant. The effects as a function of the concentration of extractant and HCl on the extraction of In were investigated. The extraction of In and Ga increased with decreasing HCl concentration, but that of Fe and Al was independent. Separation factor between In and Ga of 115 was obtained at 1.0 M D2EHPA in the presence of 0.5 M HCl of feed solution. Consequently, this study shows that D2EHPA is suitable extractant for In extraction from the synthesis solution. Extraction efficiency and separation factor could be increased by controlling HCl and extractant concentration.

In this study, we have investigated solvent extraction of Ga and recovery of high pure Ga solution from MOCVD dust formanufacturing of LED chip. Effect of extractan, concentration of extractant were examined for choosing the more effectiveextractant and high pure Ga solution was fabricated by multi-stage extraction/stripping process. For extraction/separation of Gabased on the analysis of raw-material in previous study, 3 different extractants PC 99A, DP-8R, Cyanex 272 has been inves-tigated and the extraction efficiency of 1.5 M Cyanex 272 was 43.8%. It was conformed that extraction efficiency of Ga was83% in multi-stage extraction and 5N high purity Ga stripping solution without impurities also obtained.Key words : MOCVD dust, Ga purification, solvent extraction, Cyanex 272 · Received : June 25, 2015 · Revised : July 15, 2015 · Accepted : July 24, 2015Corresponding Author : Chan Gi Lee (E-mail : cglee@iae.re.kr)Advanced Materials & Processing Center, Institute for Advanced Engineering, 175-28, 51 Goan-ro, Baegam-myeon, Cheoin-gu,Youngin-si, Gyeonggi-do, 449-863, Koreaⓒ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.

Various waste PCBs arose during disassembly of LCD TVs and monitors in which they originally functioned for transmission of imaging signal, power supply, and imaging control. In those functional PCBs, gold and copper are contained at far more acceptable level, exceeding mining grade ores. Those valuable metals and their contents widely vary with functionality and end use of PCBs. Therefore, compositional analysis of individual waste PCBs from disassembled LCD TVs and monitors were performed in the present study to classify them into three categories: high gold yield and low gold yield PCBs and those without gold contents. Besides, additional chemical analysis was made to reveal gold and copper contents in the waste PCBs arising from actual disassembly/separation of end-of-life LCD TVs and monitors.

The glass has been used continuously since ancient period up to the present day. The smart glass industry in which the advanced technology is added is developing. The life cycle of the smart glass is faster than traditional glass. Therefore, the basic and core technology development is needed for recycling of smart glass according to the replace period. Among the smart glass the recycling development of the automobile industry is the most needed areas. At the end of life of the automobile, the amount of the smart glass is expected to be over 23,000 tons per year. In this paper, the current status of domestic Korean automobile glass has been comprehensively investigated. Finally, Korean domestic smart glass recycling technology is also briefly introduced.