Adsorption of Oleate on Collophane Surface Studied by Microscopic Reflectance Infrared Fourier Transform Spectroscopy
YE Jun-jian1, 3, 4, ZHANG Qin2, 3, 4*, HOU Bo2, 3, 4, SHEN Zhi-hui2, 3, 4, LI Xian-hai2, 3, 4
1. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
2. Mining College, Guizhou University, Guiyang 550025, China
3. National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China
4. Guizhou Key Laboratory of Comprehensive Utilization of Non-Metallic Mineral Resources, Guiyang 550025, China
Abstract：Infrared spectral analysis technology has become one of the most important research techniques in the field of action mechanism of flotation reagents. Due to the high adsorptivity of mineral, it is difficult to detect the weak signal of adsorbed reagents on mineral surface by traditional transmission infrared KBr disc spectroscopy. In this study, the adsorption form and morphology of oleate on collophane surface were measured by microscopic reflectance infrared Fourier transform at various oleate concentrations. We found that the reflectance infrared spectroscopy had greater sensitivity for adsorbed oleate species on surface when being compared with transmission infrared technique, which was more suitable to reveal the adsorption mechanism at normal flotation concentrations of oleate. The results showed that the chemisorbed oleate at a single peak of 1 552 cm-1 and calcium oleate precipitate physically adsorbed at doublet peaks of 1 570 and 1 535 cm-1 coexisted on the collophane surface at lower oleate concentration under alkaline condition. In addition, when the oleate concentration was over critical micelle concentration, the collophane surface became hydrophilic due to the adsorption of oleate micelles, which made sodium oleate solution leave on the surface, so the above peaks were covered by the sodium oleate peak of 1 560 cm-1. What’s more, the peak intensity of adsorbed oleate sharply decreased after being washed with deionized water, because the residual sodium oleate and calcium oleate precipitate physically adsorbed could be rinsed. Besides, according to the two-dimensional micrographs, with the increase of sodium oleate concentration the adsorbed oleate aggregated into the laminated structure from a dot structure, and its coverage enlarged but it was not a complete coverage. This was attributed to the surface heterogeneity. These could provide a better understanding of the interaction mechanism between oleate and collophane in the flotation of phosphate ores and high-phosphorus iron ores.
[1] XU Peng-yun, LI Jing, CHEN Zhou, et al(许鹏云，李 晶，陈 洲，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2017, 37(8): 2389.
[2] ZHENG Guo-xi, JIA Fang-ru(郑国锡，贾方如). Industrial Minerals & Processing(化工矿山技术), 1983, (3): 36.
[3] ZHU Yi-min(朱一民). Non-Ferrous Mining and Metallurgy(有色矿冶), 1988, (3): 10.
[4] Cao Q, Cheng J, Wen S, et al. Minerals Engineering, 2015, 78: 114.
[5] FENG Qi-ming, ZHAO Yan-sen, ZHANG Guo-fan(冯其明，赵岩森，张国范). The Chinese Journal of Nonferrous Metals(中国有色金属学报), 2012, 22(10): 2902.
[6] Gong W Q, Parentich A, Little L H, et al. Colloids and Surfaces, 1991, 60: 325.
[7] Gong W Q, Parentich A, Little L H, et al. Langmuir, 1992, 8: 118.
[8] Hind A R, Bhargava S K, McKinnon A. Advances in Colloid and Interface Science, 2001, 93(1): 91.
[9] Lu Y, Drelich J, Miller J D. Journal of Colloid and Interface Science, 1998, 202: 462.
[10] Miller J D, WANG Jing-liang, YU Tian(米勒 J D，汪镜亮，雨 田). Metallic Ore Dressing Abroad(国外金属矿选矿), 2002，(5): 11.
[11] Mielczarski J A, Cases J M, Tekely P, et al. Langmuir, 1993, 9(12): 3357.
[12] ZOU Wei-qi, ZOU Yu-liang, ZHANG Xue-jun(邹伟奇，邹育良，张学军). Petroleum Geology & Oilfield Development in Daqing(大庆石油地质与开发), 2013, 32(3): 45.
[13] PENG Wen-shi, LIU Gao-kui, KE Li-qin(彭文世，刘高魁，柯丽琴). Acta Mineralogica Sinica(矿物学报), 1986, 6(1): 26.
[14] WENG Shi-fu(翁诗甫). Fourier Transform Infrared Spectroscopy(傅里叶变换红外光谱分析). 2nd ed.(第2版). Beijing: Chemical Industry Press(北京: 化学工业出版社), 2010. 305.
[15] Somasundaran P, Amankonah J O, Ananthapadmabhan K P. Colloids and Surfaces, 1985, 15: 309.
[16] Paiva P R P, Monte M B M, Simo R A, et al. Minerals Engineering, 2011, 24(5): 387.
[17] Chennakesavulu K, Raju G B, Prabhakar S, et al. International Journal of Mineral Processing, 2009, 90(1-4): 101.
[18] JIN Gu(金 谷). Surfactant Chemistry(表面活性剂化学). 2nd ed.(第2版). Hefei: Press of University of Science and Technology of China(合肥: 中国科学技术大学出版社), 2013. 101.
