Dingquan Xing,Yuqing Huang,Changsheng Lin,Weiran Zuo,Rongdong Deng
Sulfidization flotation is the primary method for the commercial processing of zinc oxide minerals; however, hemimorphite cannot be effectively processed by this method because of the lack of sulfide active sites on its surface. In this paper, a promising method for increasing the number of sulfide active sites on the hemimorphite surface through surface modification with fluorine ions is proposed. Microflotation tests show that the floatability of fluorine ion-modified hemimorphite was superior to that of the bare hemimorphite in the presence of fluorine ions with a concentration of 5 × 10 −5 mol/L. Furthermore, the recovery increased by 3–5%, while the activator (Na 2 S and Pb 2+ ) dosage decreased by 11.1%. Moreover, the proposed method improved the separation index of hemimorphite and quartz and increased the grade and recovery of hemimorphite. The mechanism involves corrosion of the hemimorphite surface by fluorine ions, resulting in a reduction in the Si content of the hemimorphite surface and the exposure of the originally masked Zn. The exposed Zn exhibited strong reactivity toward vulcanizators to form ZnS; this generated the more hydrophobic species PbS, thereby facilitating the absorption of xanthate species onto the sulfurized mineral surface and enhancing its hydrophobicity .
Xueming Yin,Jin Yao,Bin Yang,Wanzhong Yin,Wenbo Li,Jiayi Liu
Actinolite is often associated with hematite and tends to form fine-grained particles during grinding, which makes the recovery and separation of hematite through flotation challenging. This study innovatively used polyethylene oxide (PEO) as a flocculant and, in a reverse flotation system with dodecylamine (DDA) as the collector, increased the recovery rate of actinolite by 40.59 %, the desilication rate of the binary artificial mixed ore by 25.23 %, and that of the ternary artificial mixed ore by 4.62 %. The study also investigated the effect of PEO on the structure of actinolite during flocculation and the relationship between the structure of actinolite flocs and their floatability. Laser particle size and turbidity tests indicated that PEO significantly increased the particle size of fine actinolite, causing it to aggregate into flocs while reducing its settling velocity and apparent density. Optical microscopy and scanning electron microscopy observations revealed that the low density of the flocs was due to PEO flocculating fine actinolite into porous and irregular spherical shapes with high surface roughness and specific surface area. Energy dispersive spectroscopy analysis and wrapping angle analysis demonstrated that the flocs have a large specific surface area, apparent volume, and are subject to greater buoyancy, making them more likely to attach onto the surface of bubbles and be carried by them. Therefore, PEO can be used as a flocculant for the flotation of actinolite, increasing the floatability of fine-grained actinolite and thereby enhancing the flotation removal rate of actinolite in hematite. The mechanism of fine-grained actinolite flocculation enhancing reverse flotation desilication of hematite.
危险品化学品经营许可证（带存储）