Yu Xie,Wanzhong Yin,Jin Yao,Feijia Xue,Jiayi Liu,Xiaoqi Ban
Chlorite is often associated with hematite and tends to form microfine particles during grinding, making it challenging to recover and separate from hematite through flotation . This study innovatively applies an ester-based cationic polyacrylamide (CPAM) as a flocculant in a reverse flotation system using dodecylamine (DDA) as a collector, to flocculate and recover microfine-grained chlorite. The method achieves efficient separation between microfine chlorite and hematite. Laser particle size testing and optical microscopy show that CPAM significantly increases the apparent particle size of microfine chlorite, causing it to aggregate into flocs, while having a extremely weak effect on hematite flocculation . Further analysis using techniques like Zeta potential , contact angle measurement, Fourier-transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) reveals CPAM's stronger adsorption affinity for chlorite compared to hematite. The ester groups in CPAM selectively form hydrogen bonds with chlorite's surface H atoms, enhancing its hydrophobicity. Particle-bubble attachment angle testing confirms that the flocculated chlorite flocs exhibit better floatability and higher efficiency in collision and adhesion with bubbles. Thus, CPAM serves as an efficient flocculant for reverse flotation separation of microfine chlorite and hematite.
Yongchao Miao,Shuming Wen,Qicheng Feng,Shaojun Bai
The efficient flotation of microfine ilmenite is attracting growing interest in the field of mineral processing. In this study, the flotability of microfine ilmenite (18–37 μm) with a single collector (NaOL or OHA) or mixed collector (NaOL/OHA) was studied by micro-flotation tests, and the molar ratio of the two collectors to maximize ilmenite flotation was determined. The positive synergistic effect between the two collectors was confirmed by a surface tension calculation. Zeta potential, adsorption experiment, and X-ray photoelectron spectroscopy measurements (XPS) showed that the mixed collector could co-adsorb at the Ti and Fe sites on the surface of ilmenite and the adsorption strength of the mixed collector was stronger than that of either single collector. The adsorption morphology of flotation reagents on the mineral surface was observed by atomic force microscopy (AFM), which confirmed that the mixed collector had high coverage on the ilmenite surface, indicating the existence of co-adsorption. The results of molecular dynamics (MD) simulations indicated that the relative concentration of water in the hydration film on the ilmenite surface decreased considerably and the hydrophobicity increased after exposure to the mixed collector.
危险品化学品经营许可证（带存储）