Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan; Department of Applied and Environmental Chemistry, University of Chittagong, Chittagong 4331, Bangladesh.
J Hazard Mater. 2013 Jun 15;254-255:10-17. doi: 10.1016/j.jhazmat.2013.03.028. Epub 2013 Mar 22.
Indium is a rare metal that is mostly consumed as indium tin oxide (ITO) in the fabrication process of liquid crystal display (LCD) panels. The spent LCD panels, termed as LCD-waste hereafter, is an increasing contributor of electronic waste burden worldwide and can be an impending secondary source of indium. The present work reports a new technique for the reclamation of indium from the unground LCD-waste using aminopolycarboxylate chelants (APCs) as the solvent in a hyperbaric environment and at a high-temperature. Microwave irradiation was used to create the desired system conditions, and a substantial abstraction of indium (≥80%) from the LCD-waste with the APCs (EDTA or NTA) was attained in the acidic pH region (up to pH 5) at the temperature of ≥120 °C and the pressure of ~50 bar. The unique point of the reported process is the almost quantitative recovery of indium from the LCD-waste that ensured via the combination of the reaction facilitatory effect of microwave exposure and the metal extraction capability of APCs. A method for the selective isolation of indium from the extractant solution and recycle of the chelant in solution is also described.
铟是一种稀有金属，主要在液晶显示器（LCD）面板的制造过程中作为铟锡氧化物（ITO）消耗。废液晶显示器面板（简称 LCD 废料）是全球电子废物负担不断增加的主要来源，并且可能成为铟的潜在二次来源。本工作报道了一种从未研磨的 LCD 废料中回收铟的新技术，使用氨多羧酸盐螯合剂（APC）作为溶剂，在高压环境和高温下进行。微波辐射用于创造所需的系统条件，并且在温度≥120°C 和压力约 50 巴的酸性 pH 区域（最高可达 pH 5）中，APC（EDTA 或 NTA）从 LCD 废料中提取了大量的铟（≥80%）。该报告过程的独特之处在于，通过微波暴露的反应促进作用和 APC 的金属提取能力的结合，几乎可以从 LCD 废料中定量回收铟。还描述了一种从萃取剂溶液中选择性分离铟和在溶液中循环螯合剂的方法。
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