Selective removal of dolomite from rare earth element-bearing phosphorite by flotation and leaching and the adsorption mechanism of agents on mineral surfaces

IF 1.6 4区化学 Q4 CHEMISTRY, PHYSICAL

Surface and Interface Analysis Pub Date : 2023-11-21 DOI:10.1002/sia.7271

Jun Xie

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引用次数: 0

Abstract

The rare earth elements (REEs)-bearing phosphorite was a potential REE resource, which contained all REEs except polonium, among them lanthanide, cerium, neodymium, and yttrium were especially enriched. REEs mainly occurred in fluorapatite (Fap) and had a high positive correlation with phosphorus content. By adopting a new green environmental fatty acid collector GJBW and through one roughing and one refining reverse flotation process, all REEs were pre-enriched. The flotation concentrate was further leached with citric acid (CA), and all REEs were further enriched. The results of X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) showed that dolomite (Dolo) was removed and Fap was enriched in phosphorite, the selective enrichment of phosphorus and REEs was realized. Density functional theory (DFT) calculation revealed the mechanism of deep purification of REEs and phosphorus in phosphorite by CA at the micro-scale. The results showed that the number and strength of bonding between CA and Dolo (104) surface were greater than that between CA and Fap (001) surface, and CA was more easily adsorbed on Dolo (104) surface. Under the same conditions, Dolo in phosphorite was more easily leached by CA, while Fap was further enriched. This process provided a theoretical basis for the comprehensive recovery of REEs and phosphorus from phosphorite.

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浮选浸出法选择性去除含稀土磷矿中的白云石及药剂在矿物表面的吸附机理

含稀土磷矿是一种潜在的稀土资源，除钋外，其余稀土元素均富集，其中镧系元素、铈、钕和钇富集。稀土元素主要赋存于氟磷灰石(Fap)中，与磷含量呈高度正相关。采用新型绿色环保型脂肪酸捕收剂GJBW，通过1粗1精反浮选工艺，对所有稀土元素进行了预富集。浮选精矿用柠檬酸(CA)进一步浸出，所有稀土元素进一步富集。x射线衍射仪(XRD)、傅里叶变换红外光谱(FT-IR)和x射线光电子能谱(XPS)分析结果表明，磷矿中白云石(Dolo)被去除，Fap富集，实现了磷和稀土的选择性富集。密度泛函理论(DFT)计算揭示了微尺度CA深度净化磷矿中稀土和磷的机理。结果表明，CA与Dolo(104)表面的结合次数和强度大于CA与Fap(001)表面的结合次数和强度，CA更容易吸附在Dolo(104)表面。在相同条件下，磷酸矿中的Dolo更容易被CA浸出，而Fap则进一步富集。该工艺为磷矿中稀土和磷的综合回收提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Surface and Interface Analysis 化学-物理化学

CiteScore

3.30

自引率

5.90%

发文量

130

审稿时长

4.4 months

期刊介绍： Surface and Interface Analysis is devoted to the publication of papers dealing with the development and application of techniques for the characterization of surfaces, interfaces and thin films. Papers dealing with standardization and quantification are particularly welcome, and also those which deal with the application of these techniques to industrial problems. Papers dealing with the purely theoretical aspects of the technique will also be considered. Review articles will be published; prior consultation with one of the Editors is advised in these cases. Papers must clearly be of scientific value in the field and will be submitted to two independent referees. Contributions must be in English and must not have been published elsewhere, and authors must agree not to communicate the same material for publication to any other journal. Authors are invited to submit their papers for publication to John Watts (UK only), Jose Sanz (Rest of Europe), John T. Grant (all non-European countries, except Japan) or R. Shimizu (Japan only).