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2 Physicochemical Problems of Mineral Processing

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Reverse flotation of collophanite at natural pH using isooctyl polyoxyethylene ether phosphate as a collector

Li Hongqiang, Zhang Wen, Chen Qian, Huang Peng, Kasomo Richard M., Zou Ze, Weng Xiaoqing, He Dongsheng, Yang Siyuan, Song Shaoxian

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 4

78--86

Reverse flotation of collophanite at natural pH could significantly decrease the cost of pH regulators. In this study, isooctyl polyoxyethylene ether phosphate (AEP) was tested as a new surfactant in the reverse flotation of collophanite. Micro-flotation tests were conducted, and the adsorption mechanism of the new collector was analysed using X-ray photoelectron spectroscopy (XPS) and zeta potential analyses. The results of the flotation tests demonstrated that AEP could enable dolomite to float under natural pH (pH=7.2) and showed profound selectivity towards dolomite as opposed to fluorapatite. Based on the zeta potential and XPS results, the adsorption phenomena are mainly attributed to calcium active sites on both mineral surfaces. Dolomite possesses more magnesium active sites than fluorapatite, which tend to reinforce the interaction effect between AEP and dolomite. Furthermore, when compared to CO32- ions on the dolomite surface, PO43- ions on the fluorapatite surface tend to exhibit a stronger hindrance to the adsorption of AEP on the fluorapatite surface. This is attributed to their larger volumes and more charges on their surfaces, thereby causing a floatability difference between the two minerals.

Flotation separation of rutile from almandine using octadecyl amine polyoxyethylene ether as collector

Li Hongqiang, Zheng Huifang, Chen Qian, Kasomo Richard M., Leng Jiahao, Weng Xiaoqing, Song Shaoxian, Xiao Linbo, Tian Chengtao

Physicochemical Problems of Mineral Processing

2020

Vol. 56, iss. 4

653--664

In this study, the flotation separation of rutile from almandine using cationic surfactant Octadecyl amine polyoxyethylene ether (AC1815) as a new collector was investigated. The adsorption mechanism of AC1815 on rutile was illustrated through zeta potential measurement, infrared spectrum and XPS analyses. The flotation experiments demonstrated that AC1815 exhibited an excellent collecting ability and selectivity for rutile. The results of zeta potential measurements and XPS analysis indicated that more AC1815 was adsorbed on rutile surface instead of almandine. The adsorption mechanism of AC1815on rutile was mainly attributed to the electrostatic interaction between the positively charged molecules of AC1815 and the negatively charged rutile surface, and the hydrogen bonding between the protonated ≡NH+, ≡N group of AC1815 and Ti-OH on rutile surface.