Dong Jingshen, Liu Quanjun, Subhonqulov S H
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China E-mail:
Water Sci Technol. 2021 Jan;83(1):152-161. doi: 10.2166/wst.2020.568.
The flotation separation and mechanism of dextrin on chalcopyrite and arsenopyrite surface were investigated using micro-flotation tests, zeta potential measurements, infrared spectroscopy, contact angle measurement and surface adsorption experiments. The micro-flotation test showed that dextrin had obvious inhibitory effect on arsenopyrite flotation, but had no inhibitory effect on chalcopyrite flotation. After treating the surface of arsenopyrite with dextrin, the infrared spectra showed that new characteristic peaks, indicating that chemical adsorption and significant interaction between dextrin and arsenopyrite particles. Zeta potential measurements, contact angle measurement and surface adsorption experiments showed that the selective adsorption of dextrin added a large number of hydrophilic groups to the surface of arsenopyrite, but had little effect on chalcopyrite. In addition, the macromolecular chain structure of dextrin may hinder the attachment of collector molecules to arsenopyrite. The combined effect of these two aspects makes the arsenopyrite treated with dextrin lose its hydrophobicity and enables the separation of chalcopyrite and arsenopyrite.
采用微浮选试验、ζ电位测量、红外光谱、接触角测量和表面吸附实验等方法，研究了糊精在黄铜矿和毒砂表面的浮选分离及作用机理。微浮选试验表明，糊精对毒砂浮选有明显的抑制作用，但对黄铜矿浮选无抑制作用。用糊精处理毒砂表面后，红外光谱显示出现了新的特征峰，表明糊精与毒砂颗粒之间发生了化学吸附和显著的相互作用。ζ电位测量、接触角测量和表面吸附实验表明，糊精的选择性吸附在毒砂表面引入了大量亲水基团，但对黄铜矿影响较小。此外，糊精的大分子链结构可能会阻碍捕收剂分子与毒砂的附着。这两个方面的综合作用使得经糊精处理的毒砂失去疏水性，从而实现黄铜矿与毒砂的分离。
