低温空气等离子体对石英表面性质的影响

发布时间：2018-12-17 04:15

【摘要】：为增加石英与褐煤的可浮性差异,提出了采用低温空气等离子体改性的思路。采用扫描电镜(SEM)、能谱分析(EDS)、X射线光电子能谱分析(XPS)、接触角、浮选试验研究了等离子体处理对石英表面性质、可浮性的影响。SEM结果显示改性后表面形貌变化不大,新生了1~5μm的硅酸盐矿物颗粒;XPS分析表明C—C/C—H含量逐渐降低,C—O含量逐渐增大,C O,COO含量基本不变;接触角及浮选试验结果表明处理1~5 min石英与褐煤接触角差值增大了2.5~3.2倍。单独浮选时处理后石英浮出率基本不变,褐煤浮出率显著降低。混合浮选时,采用等离子体预处理获得了精煤灰分8.32%、产率37.8%的良好指标。等离子体改性显著扩大了石英与褐煤可浮性差异,利用其抑制褐煤反浮选石英是可行的。
[Abstract]:In order to increase the difference of floatability between quartz and lignite, the idea of low temperature air plasma modification was put forward. The contact angle of (XPS), was analyzed by (EDS), X ray photoelectron spectroscopy (XPS) with scanning electron microscope (SEM),). The surface properties of quartz treated by plasma were studied by flotation test. The effect of floatability. SEM results showed that the surface morphology of the modified particles changed little, and the silicate mineral particles of 1 ~ 5 渭 m were regenerated. XPS analysis showed that the content of C-C/C-H decreased gradually, the content of C-O increased gradually, and the contact angle and flotation test showed that the difference of contact angle between quartz and lignite treated with 1 ~ 5 min was increased by 2.5 ~ 3.2fold. The floatation rate of quartz is basically unchanged and the floatation rate of lignite is significantly decreased. In mixed flotation, plasma pretreatment was used to obtain a good index of ash content 8.32 and yield of 37.8%. Plasma modification has greatly enlarged the difference of floatability between quartz and lignite, and it is feasible to suppress reverse flotation of quartz with lignite.
【作者单位】： 中国矿业大学化工学院;国家煤加工与洁净化工程技术研究中心;
【基金】：“十二五”国家科技支撑计划资助项目(2014BAB01B02) 国家自然科学基金资助项目(51704290) 江苏省自然科学基金资助项目(BK20170285)
【分类号】：TD923;TD94
，

本文编号：2383638