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基于天然产物石榴皮碱的pH和光开关型捕收剂对铝酸锂的浮选

Lithium aluminate flotation by pH- and light-switchable collectors based on the natural product punicine.

作者信息

Zgheib Ali, Acker Sophie, Fischer Maximilian Hans, Namyslo Jan C, Strube Franziska, Rudolph Martin, Fittschen Ursula E A, Wollmann Annett, Weber Alfred P, Nieger Martin, Schmidt Andreas

机构信息

Clausthal University of Technology, Institute of Organic Chemistry Leibnizstrasse 6 D-38678 Clausthal-Zellerfeld Germany

Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology Chemnitzer Str. 40 D-09599 Freiberg Germany.

出版信息

RSC Adv. 2024 Mar 20;14(13):9353-9364. doi: 10.1039/d4ra00116h. eCollection 2024 Mar 14.

DOI:10.1039/d4ra00116h
PMID:38510489
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10952527/
Abstract

Derivatives of the natural product punicine [1-(2',5'-dihydroxyphenyl)pyridinium chloride] were developed as switchable collectors for the flotation of lithium-containing engineered artifical minerals (EnAMs). These EnAMs are formed by pyrometallurgical processing of end-of-life lithium-ion batteries. Depending on the pH value and the lighting conditions, punicines exist in water as cations, two different electrostatically neutral mesomeric betaines, anionic tripoles, radical cations or radical anions. The radical species form by photochemically induced disproportionation reactions. We prepared punicine derivatives introducing alkyl chains in the pyridinium moiety (4-methyl, 4-ethyl, 4-octyl and 4-undecanyl) to install hydrophobic groups and examined the recovery rates of the flotation of lithium aluminate (LiAlO). We varied the lighting conditions (darkness, daylight, LED irradiation at = 390-400 nm) and the pH value, the collector's and frother's concentration, and the flotation time. With our collectors, recovery rates of lithium aluminate up to 90% were accomplished when the flotation was conducted in Hallimond tubes exposed to daylight at pH 11 in water.

摘要

天然产物石榴碱[1-(2',5'-二羟基苯基)氯化吡啶]的衍生物被开发为用于浮选含锂工程人造矿物（EnAMs）的可切换捕收剂。这些EnAMs是通过对报废锂离子电池进行火法冶金处理而形成的。根据pH值和光照条件，石榴碱在水中以阳离子、两种不同的静电中性互变异构甜菜碱、阴离子三极体、自由基阳离子或自由基阴离子的形式存在。自由基物种通过光化学诱导的歧化反应形成。我们制备了在吡啶鎓部分引入烷基链（4-甲基、4-乙基、4-辛基和4-十一烷基）以引入疏水基团的石榴碱衍生物，并研究了铝酸锂（LiAlO）浮选的回收率。我们改变了光照条件（黑暗、日光、波长为390-400 nm的LED照射）、pH值、捕收剂和起泡剂的浓度以及浮选时间。使用我们的捕收剂，当在Hallimond管中于pH值为11的水中暴露于日光下进行浮选时，铝酸锂的回收率可达90%。

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