辛基羟肟酸浮选锡石的机理

发布时间：2018-11-17 14:10

【摘要】：为探明辛基羟肟酸对锡石的捕收性能及其吸附机理,本文通过单矿物浮选实验,考察了辛基羟肟酸、水杨羟肟酸和苯甲羟肟酸体系中锡石的浮选行为,通过吸附量测定、红外光谱测试、动电位、光电子能谱分析、溶液化学计算研究了辛基羟肟酸对锡石的作用机理.浮选实验结果表明:辛基羟肟酸对锡石的捕收能力明显强于水杨羟肟酸和苯甲羟肟酸,当辛基羟肟酸质量浓度为50mg/L,pH为10左右时,锡石的回收率最高达到91.79%.吸附量测试结果显示:在pH为10时,辛基羟肟酸在锡石表面的吸附量最大为0.23mg/g,与浮选结果一致.XPS分析,Zeta电位和红外光谱测试结果表明:辛基羟肟酸在锡石表面主要发生化学吸附,同时也可能存在物理吸附.辛基羟肟酸的溶液化学计算得出:对锡石浮选起主导作用的是离子-分子缔合物.辛基羟肟酸在锡石表面形成强疏水性的缔合物,可作为锡石的强效捕收剂.
[Abstract]:In order to find out the trapping property and adsorption mechanism of octyl hydroxamic acid on cassiterite, the flotation behavior of cassiterite in the system of octyl hydroxamic acid, salicylhydroxamic acid and benzyl hydroxamic acid was investigated by single mineral flotation experiment. The mechanism of octyl hydroxamic acid acting on cassiterite was studied by IR, potentiodynamic, photoelectron spectroscopy and solution chemical calculation. The flotation results show that octyl hydroxamic acid is better than salicyloxime acid and benzyl hydroxamic acid in collecting cassiterite. When the mass concentration of octyl hydroxamic acid is about 50 mg 路L ~ (-1), the highest recovery of cassiterite is 91.79 g 路L ~ (-1) 路L ~ (-1). The adsorption capacity of octyl hydroxamic acid on cassiterite surface was 0.23 mg / g when pH was 10:00, which was consistent with flotation results. XPS analysis showed that the adsorption capacity of octyl hydroxamic acid on cassiterite was 0.23 mg / g. The results of Zeta potential and IR spectra showed that octyl hydroxamic acid was mainly chemically adsorbed on cassiterite, and there might also be physical adsorption. The solution chemistry calculation of octyl hydroxamic acid shows that the ion-molecular association complex dominates the flotation of cassiterite. Octyl hydroxamic acid forms a hydrophobic association complex on the surface of cassiterite and can be used as a strong collector of cassiterite.
【作者单位】：武汉理工大学资源与环境工程学院;中南大学资源与生物工程学院;
【基金】：国家自然科学基金项目(51504175) 中国博士后科学基金项目(2013M542076)
【分类号】：TD923;TD97

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