Selective flotation of scheelite from calcite using xanthan gum as depressant
Selective flotation of scheelite from calcite using xanthan gum as depressant
复制标题
使用黄原胶作为抑制剂从方解石中选择性浮选白钨矿
DOI：
10.1016/j.mineng.2019.04.030
复制
发表时间：
2019-07-01
影响因子：
4.8
通讯作者：
Liu, Wei
中科院分区：
文献类型：
--
作者：
Dong, Liuyang;Jiao, Fen;Liu, Wei
研究了一种清洁、无毒的高分子多糖黄原胶（XG）作为浮选分离白钨矿和方解石的助熔剂。通过吸附实验、傅立叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析，探讨了其选择性缓蚀机理。结果表明，XG对方解石具有较强的选择性抑制作用。XG对白钨矿的浮选回收率影响不大。吸附实验表明，XG在方解石表面的吸附密度远高于白钨矿。红外光谱结果表明，XG在方解石表面发生了选择性吸附，而油酸钠（NaOL）在XG存在下仍能在白钨矿表面发生化学吸附。XPS结果表明，XG的羧基（-COO-）可以与方解石表面的钙离子物种发生化学螯合作用。原子力显微镜（AFM）直观地观察到XG在方解石表面的覆盖度和吸附密度均高于白钨矿表面。因此，方解石表面比白钨矿表面吸附更多的捕收剂NaOL，这阻碍了捕收剂NaOL的进一步吸附。这大大恶化了方解石的浮选，并实现了两种矿物之间的浮选分离。
Xanthan gum (XG), a clean, non-toxic macromolecular polysaccharide, was studied as a depressant in the flotation separation of scheelite from calcite. Its selective inhibition mechanism was investigated by adsorption experiments, fourier transform infrared spectroscopy (FTIR) analysis and X-ray photoelectron spectroscopy (XPS) analysis. It was found that the XG exhibited a strong selective depressive effect on calcite. However, XG had minimal effect on the flotation recovery of scheelite. Adsorption experiments indicated that the adsorption density of XG on the surface of calcite was much higher than that of scheelite. FTIR results indicated that XG was selectively chemisorbed on calcite surface, while sodium oleate (NaOL) can still be chemisorbed on scheelite surface in the presence of depressant XG. XPS results indicated that the carboxyl groups (-COO-) of the XG can be chemically chelated with the calcium ions species on calcite surface. It was intuitively observed by atomic force microscopy (AFM) that the coverage and adsorption density of XG on calcite surface were higher than that of the scheelite surface. As such, the calcite surface adsorbed more depressant XG than that of scheelite, which hindered the further adsorption of the collector NaOL. This greatly deteriorated the flotation of calcite and achieved flotation separation between the two minerals.