黄铁矿
X射线光电子能谱
粒径
表面改性
毒砂
粒子(生态学)
硫化物矿物
吸附
化学
学位(音乐)
化学工程
接触角
硫化物
材料科学
无机化学
矿物学
铜
有机化学
地质学
黄铜矿
物理化学
海洋学
物理
声学
工程类
作者
Jincheng Ran,Dehao Kong,Yuepeng Li,Meihong Jiang,Xiaoyan Yu,Rongdong Deng
标识
DOI:10.1016/j.apt.2022.103762
摘要
Particle size is an important parameter to determine the surface modification degree of sulfide minerals by plasma as well as the floatability of minerals. However, little studies have been reported to quantitatively relate surface oxidation and sample particle size to flotation performance. In this study, X-ray photoelectron spectroscopy (XPS) was used to characterize the surface species of arsenopyrite and pyrite at different plasma modification times. The critical oxidation degree was quantified as the proportion of hydrophilic oxidation species to hydrophobic species and correlated with flotation recovery. The results showed that the flotation recoveries of minerals with different particle sizes were determined by surface oxidation rate and critical oxidation degree. Fine particles were more likely to become hydrophilic under low-temperature plasma modification and yet the critical oxidation degree was also higher. The coarse particles being plasma modification presented a poor flotation recovery due to its low adsorption density of collector, although its oxidation degree was lower than the fine size fraction. The critical oxidation degree of pyrite was expected to be less than arsenopyrite, but its flotation recovery was higher under the same plasma medication time because of its slower oxidation rate.
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