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Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recyclinga??A Review

机译：两液浮选法分离用于材料回收的超细稀土荧光粉混合物a综述

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This paper reviews two separation methods applying two-step two-liquid flotation for recovering ultra-fine rare earth fluorescent powders (i.e., red, green, and blue). The paper aims to extract the science behind separation by two-liquid flotation, and to provide resulting engineering tips for material recycling. Two-liquid flotation, also called liquid-liquid extraction, involves two solvents (i.e., non-polar and polar solvents) to capture hydrophobic/hydrophobized particles at their interface, and a surfactant to selectively modify the surface property of the target powder(s). For separating a three powder mixture, two different developed flowsheets, composed of two-step separation are discussed. The major difference found was the polar solvents used. The first flowsheet (called the aqueous-organic system) employed water as a polar solvent while the second flowsheet (called the organic-organic system) utilized N,N-dimethylformamide, DMF as a polar solvent. The organic-organic system at the optimized conditions achieved both the grade and recovery of all the separated fluorescent powders at greater than 90% while the aqueous-organic system did not satisfy these criteria. This paper also reviews the mechanism behind the separation, as well as performing a cost comparison between the two methods. The cost comparison indicates that the organic-organic system is a more cost effective method for recovering rare earth fluorescent powders than the aqueous-organic system. Since the size of powders (i.e., several ?μm) is too small for the application of conventional separation technologies (e.g., froth flotation), two-liquid flotation is a unique pathway for the material recycling of ultra-fine rare earth fluorescent powders.
机译：本文概述了采用两步两液浮选回收超细稀土荧光粉（即红色，绿色和蓝色）的两种分离方法。本文旨在提取通过两液浮选进行分离的科学依据，并为材料回收提供最终的工程提示。两液浮选，也称为液液萃取，涉及两种溶剂（即非极性和极性溶剂）以在其界面处捕获疏水/疏水化的颗粒，以及一种表面活性剂以选择性地改变目标粉末的表面性质）。为了分离三种粉末混合物，讨论了由两步分离组成的两个不同的已开发流程图。发现的主要区别是所用的极性溶剂。第一个流程（称为水有机系统）使用水作为极性溶剂，而第二个流程（称为有机有机系统）使用N，N-二甲基甲酰胺，DMF作为极性溶剂。在最佳条件下，有机有机体系的分离度和回收率均高于90％，而水性有机体系不满足这些标准。本文还回顾了分离背后的机制，并进行了两种方法之间的成本比较。成本比较表明，有机有机体系比含水有机体系是一种回收稀土荧光粉的更具成本效益的方法。由于粉末的尺寸（即几μm）对于常规分离技术（例如泡沫浮选）的应用而言太小，因此两液浮选是超细稀土荧光粉的材料再循环的独特途径。

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