F-在方解石表面的吸附及其对方解石表面性质的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2785-2791.

F^-在方解石表面的吸附及其对方解石表面性质的影响

殷玉兰, 陈俊宏, 谢燕, 敖先权

贵州大学化学与化工学院,贵阳 550025

收稿日期:2022-03-17 修回日期:2022-04-25 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 敖先权,博士,教授。E-mail:aoxianquan@163.com
作者简介:殷玉兰(1995—),女,硕士研究生。主要从事矿产资源绿色高效利用的研究。E-mail:n533317456@163.com
基金资助:
国家重点研发计划(2018YFE0110300);贵州省科技计划(黔科合平台人才[2020]4105)

Adsorption of F^- on Calcite Surface and Its Effect on Calcite Surface Properties

YIN Yulan, CHEN Junhong, XIE Yan, AO Xianquan

College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

Received:2022-03-17 Revised:2022-04-25 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 氟元素主要存在于磷矿和萤石等矿物中,这些矿物中都伴生有方解石脉石矿物,在浮选分离的弱酸条件下,矿物表面的F^-会部分溶出并吸附到矿物表面,从而影响矿物表面性质。本文研究了F^-在方解石表面的吸附及其对方解石表面性质的影响机理。结果表明,在矿浆pH 值为5.5时,F^-以化学吸附的方式吸附在方解石表面,随着吸附时间的增加吸附量逐渐增加,90 min时方解石对F^-的吸附达到平衡。在油酸钠(NaOL)为捕收剂时,F^-的存在会降低方解石表面的疏水性。通过Zeta电位测试、溶液化学计算和X射线光电子能谱仪(XPS)分析表明,F^-会和方解石表面的Ca²⁺反应生成CaF₂沉淀,占据方解石表面的Ca位点,降低NaOL在方解石表面的吸附量。

关键词: F^-, 方解石, 油酸钠, 表面吸附, 表面性质, 溶液化学

Abstract: Fluoride mainly exists in minerals such as phosphate rock and fluorite, which are associated with calcite gangue minerals. Under the condition of the flotation separation of the weak acid, mineral surface of F^- will be partically dissolved and adsorbed to the mineral surface, thus affecting the mineral surface properties. The adsorption behavior of F^- on calcite surface and the effect of F^- on calcite surface properties were studied in this paper. The results show that F^- is adsorbed on calcite surface by chemisorption at 5.5 pH value of calcite pulp, and the adsorption amount increases gradually with the increase of time, and F^- adsorption by calcite reaches equilibrium at 90 min. When sodium oleate (NaOL) is used as collector, the presence of F^- weakens the hydrophobicity of calcite surface. Zeta potential test, solution chemistry calculation and X-ray photoelectron spectroscopy (XPS) analysis show that the F^- reacts with Ca²⁺on calcite surface to form CaF₂ precipitation, which occupies Ca sites on calcite surface and reduces the adsorption of NaOL on calcite surface.

Key words: F^-, calcite, sodium oleate, surface adsorption, surface property, solution chemistry

中图分类号:

TD97

殷玉兰, 陈俊宏, 谢燕, 敖先权. F^-在方解石表面的吸附及其对方解石表面性质的影响[J]. 硅酸盐通报, 2022, 41(8): 2785-2791.

YIN Yulan, CHEN Junhong, XIE Yan, AO Xianquan. Adsorption of F^- on Calcite Surface and Its Effect on Calcite Surface Properties[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2785-2791.

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