Effect mechanism of nonane-1,1-bisphosphonic acid as an alternative collector in monazite flotation: Experimental and calculational studies
发布时间：2022-04-12
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影响因子：3.712
DOI码：10.1016/j.jre.2021.05.004
发表刊物：Journal of Rare Earths
关键字：Nonane-1,1-bisphosphonic acid (C9-BPA); Monazite; Flotation; First-principles calculation; Rare earths
摘要：Monazite ((Ce, La)PO4) is one of the major types of light rare earth minerals from which the light rare earth elements cerium (Ce) and lanthanum (La) are economically extracted. Flotation is extensively used to recover fine-grained monazite. Sodium oleate (NaOL) is considered as the collector with strong collecting ability for monazite flotation. However, this study shows that its collecting ability is still limited. In this paper, a phosphonic acid, nonane-1,1-bisphosphonic acid (C9-BPA), was employed as the novel collector in place of NaOL. Flotation experiments show that even when the C9-BPA dosage is less than one-fifth of the NaOL dosage, the monazite recovery using C9-BPA as the collector is approximately 22 wt% higher than that using NaOL. The mechanism by which C9-BPA adsorbs on monazite was investigated using zeta potential, infrared (IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements as well as first-principles calculations. Zeta potential measurements show a more significant decrease in the zeta potentials of monazite after the addition of C9-BPA compared to those after the addition of NaOL. For C9-BPA-treated monazite, the characteristic peaks of C9-BPA are observed in the IR and C 1s XPS spectrum, whereas for monazite treated by NaOL, no characteristic peak of NaOL was observed. Experimental results show that C9-BPA has a stronger affinity towards the monazite surface than NaOL as confirmed by the higher adsorption energy of CP-BPA on the monazite surface (‒204.22 kJ/mol) than NaOL (‒48.48 kJ/mol). This study demonstrates an extensive application value and prospect of C9-BPA in monazite flotation and helps design novel collectors with strong collecting ability for monazite flotation.
论文类型：期刊论文
通讯作者：田孟杰
学科门类：工学
一级学科：矿业工程
是否译文：否
发表时间：2021-05-15
收录刊物：SCI
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S1002072121001241#undfig1
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