印尼某锡铁矿工艺矿物学研究

为了对印尼锡铁矿石的开发提供合理的工艺流程,对其矿石进行了系统的工艺矿物学研究。通过化学多元素分析、物相分析、矿物的定量分析以及X射线衍射分析,全面了解了该锡铁矿石的化学组成、矿物组成及相对含量,主要有用矿物为磁铁矿,含量为56.95%,有害元素磷含量为0.077%,硫含量为0.11%。利用光学显微镜和电子探针等设备,详细分析了矿物的嵌布特征、各元素的赋存状态和矿物粒度分布特征,并对不同磨矿细度产品进行了解离度分析和理论指标预测,得到合理的磨矿细度为-74μm占85%,并提出了适合该矿石的四种基本工艺流程。     

Lithium Recovery from Geothermal Water by Combined Adsorption Methods

Recovery of Li⁺ from geothermal water has been investigated using a combination of adsorptive separation with magnetite and λ-MnO₂ adsorbents. The inhibition of Li⁺ adsorption together with decomposition of λ-MnO₂ was observed when geothermal water containing As was fed to the column in which λ-MnO₂ was packed. Magnetite (Fe₃O₄) was therefore used for removal of As from the geothermal water, prior to adsorption of Li⁺. Using As removal from the geothermal water with magnetite, decomposition of λ-MnO₂ was significantly prevented during adsorption of Li⁺, although a small amount of As still remained.     

Silver coating of spindle- and filament-type magnetic particles for conductive adhesive applications

Spindle-type hematite and magnetite particles and nickel filaments have been coated uniformly with silver by using chemical reduction. The effects of the reaction time and the concentration and nature of the reducing agent on the particle coatings were investigated at constant temperature. The reaction time had a pronounced effect on the nature of the coated surface layer. Coated and core particles were examined by scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDAX). The electrical properties of the particles were also characterized. The conductivity of nickel filaments which can be oriented under a magnetic field for anisotropic electric conduction increased from 302 to 877 S/cm at 3.5 kPa pressure when coated with silver.     

Differential effects of magnetic pulses on the orientation of naturally migrating birds

In migratory passerine birds, strong magnetic pulses are thought to be diagnostic of the remagnetization of iron minerals in a putative sensory system contained in the beak. Previous evidence suggests that while such a magnetic pulse affects the orientation of migratory birds in orientation cages, no effect was present when pulse-treated birds were tested in natural migration. Here we show that two migrating passerine birds treated with a strong magnetic pulse, designed to alter the magnetic sense, migrated in a direction that differed significantly from that of controls when tested in natural conditions. The orientation of treated birds was different depending on the alignment of the pulse with respect to the magnetic field. These results can aid in advancing understanding of how the putative iron-mineral-based receptors found in birds'' beaks may be used to detect and signal the intensity and/or direction of the Earth''s magnetic field.     

用回归方程计算的磁性铁（MFe）分析老钻孔在利用中的可靠性

通过对用回归方程计算的磁性铁(MFe)的验证情况。说明对于矿山地质工作．在老钻孔的利用上．用回归方程计算的结果可靠性低。不能用于直接指导生产，至于今后如何利用矿山现有的老钻孔资料，应重新考虑新的方法。     

Preparation of cobalt-modified magnetite and its magnetic properties

Magnetite was modified by reaction with alkaline solution containing Co^2 and Fe^2 to obtain a cobalt ferrite layer on the surface of particles. The influences of modification conditions on the properties were investigated. The as-prepared particles were characterized by X-ray diffraction(XRD) and transmission electron microscope(TEM). The results show that pH value influences the particles composition directly, the desirable CoFe2O4 is obtained as pH value is 12. The coercivity of particles increases with the increase of cobalt content, and the cobalt efficiency reaches a maximum value at cobalt content of 2.71% (mass fraction). With cobalt modification, the magnetite particles have the similar lattice constant and structure to that without cobalt modification, and the squareness ratio is almost 0.5. The increase of the coercivity is attributed to the uniaxial magnetic anisotropy and magnetocrystalline anisotropy of cobalt-ferrite itself.     

提高某磁铁矿精矿指标的探讨

针对磁铁矿的粒度组成和磁性特征,根据不同粒级的磁选试验及结果分析,提出了粗、细粒级分别处理的思路,经对选矿方案的探索性试验研究,使精矿品位提高1.16%、回收率提高1.75%,对选厂的技术改进具有较好的参考价值.     

变径型磁团聚重力选矿机在峨口铁矿的应用

介绍了峨口铁矿使用变径型磁团聚重力选矿机的情况。证明在铁精矿粒度较较的情况下，仍可获得较好的选矿效果，铁精矿品位稳定在64％以上。