新型阴离子捕收剂DMY-1对细粒锡石的捕收性能

为实现细粒锡石的高效回收,东北大学研制了一种新型脂肪酸类阴离子捕收剂DMY-1。为检验DMY-1的性能、揭示其作用机理,以体积平均粒径17.71 μm的锡石单矿物为试样进行了1次浮选试验,并对与DMY-1作用前后的锡石单矿物进行了Zeta电位检测和红外光谱分析。结果表明：在矿浆温度为18 ℃、pH=9、DMY-1用量为200 mg/L情况下,泡沫产品回收率达94.50%;DMY-1对矿浆温度变化的适应能力强;DMY-1与锡石表面存在氢键和化学吸附作用。阴离子捕收剂DMY-1|细粒锡石|单矿物|浮选|作用机理     

细粒锡石浮选研究

对蒙自矿冶有限责任公司白牛厂矿区铅锌浮选流程中的磁选尾矿进行了浮锡研究。以BY-9为捕收剂, P86为辅助捕收剂, BY-5和碳酸钠为脉石抑制剂, 一次浮锡可获得锡品位8.56%,回收率61.61%的锡粗精矿,锡粗精矿再浮, 锡精矿锡品位达到53.58%,作业回收率81.35%; 尾矿锡品位1.84%, 回收率18.65%。两次浮锡获得高品位锡精矿锡总回收率50.12%,尾矿锡回收率11.49%。     

SLon离心机在云南某锡矿含锡细泥选矿中的应用

针对云南某锡矿重选矿厂分级溢流细泥锡金属流失严重的情况进行了新型高效重选设备的应用研究。确定了SLon离心机回收该细泥中锡石的最优工艺参数,并以SLon离心机为主选设备替代了现场的毛毯选矿机。工业试验结果表明,在分级溢流细泥含锡0.32%的条件下,使用SLon-800离心机离心粗选、精选得到的离心精矿进入摇床作业,全流程获得了含锡19.81%,锡回收率48.785%的锡精矿产品,并实现了大量抛尾。     

某锡石多金属硫化矿锌高效回收工艺研究

某复杂锡石多金属矿为锡石硫化物-夕卡岩型,含锌、锡矿物分别以铁闪锌矿、锡石为主,主要有价元素含量Zn 6.04％、Sn1.05％,Fe、S含量分别为29.33％、19.08％,主要脉石成分SiO2含量16.63％.为设计合理、高效回收锌工艺流程,对锌回收流程进行了对比实验研究.研究结果表明,采用脱硫—锌硫混合浮选流程,经一段脱硫、二粗一扫三精,获得了锌精矿Zn品位47.06％、Zn回收率90.76％的良好指标,为同类矿石的开发利用提供可利用途径.     

细粒锡石浮选组合药剂研究与应用进展

采用浮选工艺回收细粒锡石,药剂是关键。大量的研究与生产实践表明,浮选药剂的组合能提升锡石的综合回收指标。为了系统、全面地了解细粒锡石浮选组合药剂的研究与应用进展,综述了细粒锡石浮选的组合捕收剂、组合调整剂以及捕收剂+调整剂组合的优点、作用机理及应用现状,指出使用组合药剂能取得较理想的浮选指标与药剂间的协同作用密不可分。     

激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）测定锡石样品中微量元素

A method for determination of trace elements in cassiterite by 213 nm laser ablation inductively coupled plasma mass spectrometry with lithium tetraborate flux sample preparation procedure and in-situ focusing has been investigated. The relative deviations of measurement from flux sample preparation procedure and in-situ focusing are less 25% and 10%－120%, respectively.     

细粒锡石的电解浮选及碰撞粘附机理(英文)

为了研究细粒锡石电解浮选中颗粒气泡间的相互作用,分析不同粒级锡石的浮选回收率和锡石颗粒与氢气泡的碰撞机理。浮选实验在一个单泡电解浮选装置中进行,实验结果表明,10μm,10～20μm,20～38μm和38～74μm粒级的锡石分别与50～150μm,约250μm,约74μm和约74μm尺寸的气泡相匹配,可以获得较好的浮选回收率。因此,颗粒和气泡的大小直接影响锡石的浮选回收率。利用碰撞、粘附和捕集模型进行碰撞、粘附、分离和捕集几率的计算。理论计算结果发现碰撞几率随着颗粒尺寸的减小以及气泡尺寸(150μm)的增大而显著降低。有效的碰撞有利于粘附几率的增加,从而有利于提高浮选回收率。     

从香花岭尾矿库中回收锡石的研究与生产实践

在对尾矿性质研究基础之上,进行了尾矿脱硫及锡石富集试验,发现从尾矿中浮选合格的铅锌混合精矿或者锡石精矿均存在较大难度,但采用浮选方法首先脱除尾矿中的含硫成分,继而采用摇床分选锡石是可行的,在生产实践中获得了合格的锡石精矿.     

Amide group enhanced self-assembly and adsorption of thioether-containing hydroxamic acid on cassiterite surface

Modified surfactants can regulate their adsorption at the target surface and are essential for various separation applications such as froth flotation. Thioether-containing hydroxamic acid (BTHA) is an excellent oxidized-ore collector with poor dispersibility. Herein, acylamino, which possesses the ability to improve the surfactants' self-assembly and dispersion, was introduced to synthesize N-[6-(hydroxyamino)-6-oxohexyl] benzylthioacetamide (BTAHA); thus, applying it to cassiterite flotation. Surface tension, adsorption capacity, in situ AFM, and surface energy results reveal BTAHA displays strong bubble stability and readily adsorbs onto the mineral's surface, promoting hydrophobic flotation. BTAHA is an effective cassiterite collector and has good separation effects on cassiterite against calcite. It can form Van der Waals forces and five-membered hydroxamate-(O,O)-Sn rings with Sn atoms on cassiterite surfaces via thioether and hydroxamate groups. Meanwhile, the presence of intermolecular hydrogen bond between the amide groups facilitates the self-assembly of the collectors on the cassiterite surface, and has broad industrial application prospects in various separation processes.     

AN INTEGRATED PROCESS FOR THE RECOVERY OF TUNGSTEN AND TIN FROM A COMBINED WOLFRAMITE–SCHEELITE–CASSITERITE CONCENTRATE

This article presents results of the studies on development of viable process route for quantitative recovery of tungsten and tin values occurring together in the form of a multimineral concentrate of wolframite, scheelite, and cassiterite. The investigations were carried out using a tin–tungsten multimineral ore from Kyrgyzstan (Central Asia). Tungsten minerals in this ore occur both as distinct liberated mineral phases and as composites, viz. ultrafine dissemination of wolframite in scheelite and vice versa. Cassiterite also has similar characteristics, albeit to a lesser extent, with few grains containing ex-solution intergrowth of columbite/tantalite and very fine dissemination of tungsten minerals in its lattice. The complex nature of occurrence of both tungsten and tin minerals necessitated an integrated process comprising physical beneficiation and chemical extraction. The process route that was developed gave a tungsten and tin recovery of about 80 and 90%, respectively, on treating a primary gravity preconcentrate analyzing 16.5% WO₃ and 25.7% Sn.