新型醚酸捕收剂CY-1对绿泥石的浮选作用机理及在铁矿反浮选中的应用

Flotation mechanism of novel ether acid collector CY-1 to chlorite and its application in reverse floatation of iron ores

首次确定太钢袁家村铁矿中绿泥石的类型和化学式,针对该绿泥石中金属离子种类和含量及其碎解暴露面特点,设计并合成出新型醚酸捕收剂CY-1。通过绿泥石、赤铁矿单矿物浮选试验、微细粒富绿泥石赤磁混合铁矿实际入浮矿石浮选试验、FT-IR光谱分析、Zeta电位测试、吸附量试验、DFT计算和XPS分析研究CY-1对绿泥石矿物的浮选性能及作用机理。单矿物浮选试验结果表明,捕收剂CY-1对绿泥石的捕收能力显著强于NaOL的。碱性条件下反浮选袁家村微细粒赤磁混合铁矿时与使用NaOL捕收剂相比较:30℃时,CY-1所取得的粗精矿中铁品位和回收率分别提高2.27%和1.22%;20℃时,CY-1所取得的粗精矿中铁品位和回收率分别提高11.11%和11.84%。DFT计算表明,CY-1分子的羧基O是作用于矿物的主要位点,亲固基中的其他O也是活性供电子中心。CY-1浮选绿泥石的作用机理研究表明,分子中特有的“冠醚”结构使CY-1与绿泥石表面的Mg和Al产生化学键合反应,提高捕收剂对绿泥石的浮选捕收能力。

In this work,the type and chemical formula of chlorite in Yuanjiacun iron mine of Taiyuan Iron and Steel Company were determined for the first time.A novel ether acid collector CY-1 was designed and synthesized according to the types and contents of metal ions in the chlorite and the characteristics of its decomposition exposed surface.The flotation behavior and adsorption mechanism of CY-1 to chlorite were investigated by micro-flotation tests of single chlorite and hematite minerals,bench-scale flotation tests of fine hematite/magnetite mixed actual iron ore contained high content of chlorite,FT-IR spectra,zeta potential measurements,adsorption capacity,density functional theory(DFT)calculations and XPS.The micro-flotation results of single minerals indicate that CY-1 exhibits superior flotation performance to chlorite.The results of flotation tests of hematite/magnetite mixed actual iron ore show that,the iron concentrate grade and recovery obtained by CY-1 increase by 2.27%and 1.22%at 30℃and by 11.11%and 11.84%at 20℃,responsively compared to those by NaOL.DFT calculation results show that carboxyl O of CY-1 is the main sites for interaction with minerals,and the other O in the solidophilic group is also active center for providing electrons.CY-1 shows unique structure,such as the“crown ether”shape structure of solidophilic group,resulting in superior targeting effect on Mg and Al on dissociation surface of chlorite,which improves the collector's flotation ability to chlorite.