In this work, using syringic acid (SA) as a novel eco-friendly inhibitor and dodecylamine (DDA) as a collector in a cationic reverse flotation system, the effect of SA on the flotation separation of hematite and chlorite was investigated. Micro-flotation experiments and artificial mixed mineral experiments were conducted to study the flotation behavior of hematite and chlorite in the presence of SA. The adsorption mechanism of SA on the surfaces of hematite and chlorite was analyzed through methods such as Zeta potential, AFM, FTIR, XPS testing, and DFT calculations. Flotation experiments showed that after adding SA, the recovery rate of hematite was 88.87%, and that of chlorite was 7.01%, effectively achieving the separation of hematite and chlorite. Mechanism analysis indicated that SA could form complexes with Fe atoms, selectively adsorb on the surface of hematite, hinder the adsorption and capture of DDA on hematite, and suppress the flotation of hematite without affecting the surface properties of chlorite. Therefore, SA can serve as apotential selective inhibitor for the separation of hematite and chlorite.
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.
In this study, pectin was used as an environmentally friendly depressant to study its flotation behavior and aggregation effect on key magnesium silicate gangue minerals commonly found in nickel ore, such as talc, chlorite, and serpentine. The interaction mechanisms between pectin and minerals were explored using a series of techniques, including IC-FBRM particle size analysis, adsorption tests, scanning electron microscopy (SEM) tests, FTIR analysis, XPS analysis, and zeta potential measurements. Results from flotation experiments, IC-FBRM tests, and SEM observations indicate that under natural conditions, serpentine tends to aggregate with talc, but the three mixed minerals still exhibit floatability. At low dosages of pectin, serpentine and chlorite tend to aggregate together. Further increasing the pectin dosage reduces the recovery rate to 0%. FTIR and XPS analyses reveal that the –OH groups in pectin chemically interact with Mg atoms in chlorite. Zeta potential results show that pectin causes a significant downward shift in the zeta potential of chlorite.
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