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Heavy Metal Recovery from Waste CRT Funnel Glasses by the Combined Process of Rapid phase-separation and Mechanochemical Extraction
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2021-09-24 , DOI: 10.1021/acssuschemeng.1c04824
Mingfei Xing 1, 2 , Yuanjie Liu 1 , Yu Li 1 , Liang Zhao 1 , Zixin Li 1 , Li Zhao 1, 2
Affiliation  

An innovative and sustainable method of extracting heavy metal oxides (PbO, BaO, and SrO) from a cathode ray tube (CRT) funnel glass was developed. Funnel glass was first remelted with 20 wt % B2O3 at 1000 °C for 30 min in air atmosphere. Most of the heavy metal oxides (PbO, BaO, and SrO) were quickly migrated from the funnel glass to the B2O3-rich phase. Then, heavy metal oxides were recovered efficiently from phase separation product by a sustainable wet ball-milling process (replaced the traditional strong acid) using ethylene diamine tetraacetic acid (EDTA) as extraction reagent at room temperature. Mechanical activation caused the rapid dissolution of the B2O3-rich phase in water. Thus, heavy metal cations (Pb2+, Ba2+, and Sr2+) could be extracted as a metal-EDTA, and the solid residue was high silica glass powder (silica purity >92 wt %). The extraction rates of Pb, Ba, and Sr were 95.74%, 93.57%, and 94.76% when only milling for 5 min and reached 99.35%, 98.07%, and 96.40% for 60 min under optimum conditions: EDTA adding amount, 2 g; rotational speed, 500 rpm; and water/solid ratio, 0.8, respectively. Heavy metal ions could be recovered by sulfate precipitation, and the soluble metal-EDTA could be transformed into solid EDTA when pH < 3. Thus, this paper provides a sustainable method for detoxification and reutilization of heavy metals containing silicate waste.

中文翻译:

快速相分离和机械化学萃取联合工艺从废CRT漏斗玻璃中回收重金属

开发了一种从阴极射线管 (CRT) 漏斗玻璃中提取重金属氧化物(PbO、BaO 和 SrO)的创新和可持续方法。首先将漏斗玻璃与 20 wt% B 2 O 3在 1000 °C 下在空气中重熔30 分钟。大多数重金属氧化物(PbO、BaO 和 SrO)迅速从漏斗玻璃迁移到富含B 2 O 3 的相。然后,在室温下使用乙二胺四乙酸(EDTA)作为萃取剂,通过可持续的湿球磨工艺(取代传统的强酸)从相分离产物中有效地回收重金属氧化物。机械活化引起 B 2 O 3的快速溶解- 水中的富相。因此,重金属阳离子(Pb 2+、Ba 2+和Sr 2+)可以作为金属-EDTA 提取,固体残留物为高二氧化硅玻璃粉末(二氧化硅纯度> 92 wt%)。Pb、Ba、Sr的萃取率在5 min时分别为95.74%、93.57%和94.76%,在最佳条件下,60 min时分别达到99.35%、98.07%和96.40%:EDTA添加量,2 g ; 转速,500 rpm;和水/固体比分别为 0.8。硫酸盐沉淀可以回收重金属离子,当pH < 3时,可溶性金属-EDTA可以转化为固体EDTA。因此,本文为含硅酸盐废物的重金属解毒和再利用提供了一种可持续的方法。
更新日期:2021-10-04
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