新型羟肟酸捕收剂对硅孔雀石的浮选机理研究

Study on Flotation Mechanism of Silico-Malachite by a New Hydroxamic Acid Collector

随着易分选硫化铜矿日益消耗,氧化铜矿的开发显得尤为重要。针对硅孔雀石矿石采用直接浮选法存在捕收剂捕收能力不足的问题,研究中以苯甲酸甲酯和盐酸羟胺为原料合成了苯丙羟肟酸(BPHA),应用于硅孔雀石的浮选回收。微浮选试验表明,在pH值为9.0、BPHA用量为120 mg/L的浮选条件下,硅孔雀石的最大浮选回收率可达到75.2%。通过接触角、吸附量分析得出BPHA能提高硅孔雀石表面的接触角,增强其表面的疏水性。通过红外光谱(FT-IR)、X射线电子能谱(XPS)和扫描电子显微镜能谱仪(SEM-EDS)分析得出,BPHA与硅孔雀石作用后吸附在矿物表面,改变了矿物表面化学性质,并在矿物表面生成了疏水性的BPHA-铜物种,从而增加了硅孔雀石的可浮性。

With the increasing consumption of easily sorted copper sulfide,the development of copper oxide is particularly important.To solve the problem of insufficient collecting ability of the collector by direct flotation method,BPHA was synthesized from dimethyl phthalate and hydroxylamine hydrochloride,and BPHA was applied to the flotation recovery of malachite.The micro flotation test results show that the maximum flotation recovery of chrysocolla can reach 75.2%under the flotation condition of pH 9.0 and BPHA dosage 120 mg/L.Through the analysis of contact angle and adsorption capacity,it is concluded that BPHA can improve the contact angle and hydrophobicity of the surface of chrysocolla.Through infrared spectroscopy(FT-IR),X-ray electron spectroscopy(XPS)and scanning electron microscope energy spectrometer(SEM-EDS)analysis,it is found that the agent adsorbed on the mineral surface,changed the chemical properties of the mineral surface,and formed hydrophobic BPHA-Cu species on the mineral surface after the interaction of BPHA with chrysocolla.Thus,the floatability of malachite is increased.