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New insights into the mixed anionic/cationic collector adsorption on ilmenite and titanaugite: An in situ ATR-FTIR/2D-COS study
Minerals Engineering ( IF 4.8 ) Pub Date : 2021-05-07 , DOI: 10.1016/j.mineng.2021.106946
Liping Luo , Longhua Xu , Jinping Meng , Jiahui Lu , Houqin Wu

Elucidation of the co-adsorption characteristics of multiple functional groups will help to screen suitable reagents to improve the floatability and comprehensive utilization of valuable minerals. Herein, salicylhydroxamic acid (SHA), an anionic collector with two functional groups, mixed with a cationic collector dodecylamine (DDA) in ilmenite-titanaugite flotation system was in-depth studied mainly using in-situ attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) combined with the two-dimensional correlation spectroscopic analysis (2D–COS) and X-ray photoelectron spectroscopy (XPS). The highest flotation separation performance, at pH 8–9, can be achieved using the SHA/DDA complex with a molar ratio of 6:1. Moreover, atomic force microscope (AFM) analysis ulteriorly proved the selectivity of the mixed SHA/DDA collector in the ilmenite-titanaugite flotation system. In-situ ATR-FTIR combined with 2D-COS gave the characteristic sequential adsorption and interaction with the functional groups related to SHA/DDA, which was further confirmed in the results of XPS. The preferred adsorption configuration for the adsorption of the mixed collector were drew to explain the flotation separation between ilmenite and titanaugite. It is predictable that the detailed study into the hybrid collectors with multiple functional groups will provide new insights into the design, synthesis and development of more-powerful collectors.



中文翻译:

钛铁矿和钛铁矿上混合的阴离子/阳离子捕收剂吸附的新见解:原位ATR-FTIR / 2D-COS研究

阐明多个官能团的共吸附特性将有助于筛选合适的试剂,以提高有价值的矿物质的漂浮性和综合利用。在此,主要利用原位衰减全反射傅里叶变换红外光谱(ATR)技术,对钛铁矿-钛钙铁矿浮选系统中具有两个官能团的阴离子收集剂水杨基异羟肟酸(SHA)与阳离子收集剂十二烷基胺(DDA)进行了深入研究-FTIR)与二维相关光谱分析(2D–COS)和X射线光电子能谱(XPS)相结合。使用摩尔比为6:1的SHA / DDA复合物,可以在pH 8–9时实现最高的浮选分离性能。而且,原子力显微镜(AFM)分析进一步证明了钛铁矿-黄铁矿浮选系统中SHA / DDA混合捕集剂的选择性。XPS结果进一步证实了原位ATR-FTIR与2D-COS结合产生的特征性顺序吸附和与SHA / DDA相关官能团的相互作用。绘制了用于吸附混合捕集剂的优选吸附构型,以解释钛铁矿和钛铁矿之间的浮选分离。可以预见,对具有多个功能组的混合收集器的详细研究将为更强大的收集器的设计,合成和开发提供新的见解。XPS结果进一步证实了原位ATR-FTIR与2D-COS结合产生的特征性顺序吸附和与SHA / DDA相关官能团的相互作用。绘制了用于吸附混合捕集剂的优选吸附构型,以解释钛铁矿和钛铁矿之间的浮选分离。可以预见,对具有多个功能组的混合收集器的详细研究将为更强大的收集器的设计,合成和开发提供新的见解。XPS结果进一步证实了原位ATR-FTIR与2D-COS结合产生的特征性顺序吸附和与SHA / DDA相关官能团的相互作用。绘制了用于吸附混合捕集剂的优选吸附构型,以解释钛铁矿和钛铁矿之间的浮选分离。可以预见,对具有多个功能组的混合收集器的详细研究将为更强大的收集器的设计,合成和开发提供新的见解。

更新日期:2021-05-08
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