秘鲁特罗莫克铜矿SABC流程考查及优化措施研究

对秘鲁特罗莫克铜矿SABC流程进行了详细的考查及数据分析,查明了当前生产中SABC流程存在半自磨机磨矿效率不高、球磨机循环负荷高、旋流器分级效率低等问题。比如半自磨机的电机功率利用系数为65%～68%,排料粒度大于设计值;球磨机的循环负荷率过高,其循环负荷平均575. 71%,磨矿产品粒度组成中粗粒(≥147μm)及微细粒级(≤20μm)含量高,尤其是≤20μm粒级含量高达25%～32%,该粒级区间的金属分布率高达30. 50%～40. 81%等,没有给浮选回路创造良好的给料条件。针对这些问题,提出了提高半自磨机的入料粒度、优化半自磨机排料端结构、调整补水点位置、增加一段分级等详细的改进方案,为下一步选矿厂技术改造提供了科学依据。

锂辉石矿的选矿工艺现状与发展趋势

锂辉石矿最常见的选矿方法是浮选法,指出了该方法存在的主要问题包括传统型捕收剂或选择性不佳,或对温度敏感;“难免离子”(Ca^(2+)、Fe^(3+)、Mg^(2+)等)污染矿物表面,使得有用矿物和脉石矿物的可浮性差异变小;调整剂选择性较差,常用抑制剂在抑制脉石矿物的同时对锂辉石也有一定程度的抑制作用。锂辉石浮选药剂技术进展主要体现在锂辉石浮选捕收剂和脉石矿物调整剂方面,捕收剂研究的主要方向是寻找捕收能力强、选择性好、且高效易降解的捕收剂;小分子有机抑制剂所带极性基团的水化性越强、数量越多,其抑制效果越好。浮选新技术研究进展主要体现在自动化程度高、运行稳定、处理能力大的浮选柱的应用和电化学技术推动浮选药剂创新方面。最后介绍了锂辉石矿的其他选矿工艺还包括重介质选矿法、磁选法和联合选矿法。

某锂辉石矿选矿试验研究

介绍了某澳洲锂辉石矿的选矿试验研究结果。试验结果表明,在磨矿细度为-0.074 mm占76%时,通过一粗二扫三精+磁选除铁的选矿流程,获得了满足化工级-2的锂辉石精矿产品。同时,原矿中有价元素钽铌富集在含铁矿物中,Ta_(2)O_(5)、Nb_(2)O_(5)回收率分别达到36.55%、42.63%。

Analytic Solution to the MT Responses of a Two-Segment Model with Axially Anisotropic Conductivity Structures Overlying a Perfect Insulator

The analytic solution of the magnetotelluric fields for an idealized 2-D model which is composed of two segments with diagonal anisotropy underlain by aperfect insulator basement is considered using aquasi-static analytic approach.The analytic magnetotelluric responses for a particular model are presented.The resulting analytic solution could be used to check the numerical solutions given by numerical algorithms before more complex situations are investigated.

Analytic solution to the magnetotelluric response over anisotropic medium and its discussion

In the present paper,from the second order partial differential equations for solving the magnetotelluric(MT) fields of general anisotropic medium,we first obtained the second order partial differential equations for some anisotropic media with special conductivity(e.g.diagonal anisotropy,transverse anisotropy,azimuthal anisotropy,etc.) by simplifying the electrical conductivity tensor of anisotropic medium.And then we obtained the analytic solutions to MT fields for the case of transverse and azimuthal anisotropy through converting the conductivity parameter based on that of diagonal anisotropy.We further discussed the influence of the selection of integral limit and step length on precision in solving the analytic solutions for MT fields of isotropic medium.Finally,we presented the MT responses of two transverse and azimuthal anisotropic media as well as some applications of the analytic solutions to MT fields of anisotropic medium.