基于磁铁矿粉提高小浮沉试验准确性的研究

针对小浮沉试验中大于重液密度的沉物容易随离心液损失影响实验结果的问题,采用添加磁铁矿粉的方法,有效提高了小浮沉试验的准确性。试验探究了磁铁矿粉添加量对不同灰分煤样小浮沉试验效果的影响规律。结果表明,磁铁矿粉的添加增加了悬浮液的粘度,避免了大于悬浮液密度级的沉物随离心液流失,且磁铁矿粉易回收,从而得到更为准确的加权灰分,该方法得到的浮沉试验中的各密度级产率也更为科学有效。     

惯性圆锥破碎机在极贫磁铁矿干选抛尾工艺流程中的应用

惯性圆锥破碎机结构独特,在国内矿山、冶金等行业中已经取得了广泛应用。本文结合工业应用实例,介绍惯性圆锥破碎机的性能和特点,结合磁选工艺对极贫磁铁矿进行干式预选抛尾,成功实现极贫磁铁矿的预选富集,大幅提高铁矿石品位,扩大了可选别的资源范围。     

某超贫钒钛磁铁矿选矿试验研究

对某超贫钒钛磁铁矿开展了选矿试验研究,在工艺矿物学研究的基础之上,采用预选和再磨弱磁选工艺,获得了铁精矿铁品位58.32%,回收率60.76%的试验指标。     

冀东鞍山式磁铁矿磨矿动力学研究

通过对冀东鞍山式磁铁矿进行不同磨矿时间下磨矿产品粒度分布试验,研究其磨矿动力学行为。研究表明:通过对粒度范围内多个窄粒级动力学常数的曲线拟合,获得的磨矿动力学方程式对不同磨矿时间下筛上累积产物含量的预测精度较高;磨矿过程中,当磨矿细度大于1 mm时,冀东鞍山式磁铁矿磨矿动力学参数k值随磨矿粒度减小而变小的变化趋势与矿粒越细裂纹越少、磨矿越困难的规律是一致的,而当磨矿细度为-1+0.5 mm粒级时,存在对硬度较低、较易磨的磁铁矿和辉石的优先选择性粉碎,所以为避免过粉碎、节约磨矿成本,在该类矿石选矿时应采用阶段磨矿阶段选别工艺,将单体解离的磁铁矿及时选出。     

某细粒铁矿石磁选-选择性絮凝脱泥研究

对某细粒铁矿石开展了磁选-选择性絮凝脱泥试验研究。结果表明, 矿石中磁铁矿为中细粒嵌布, 赤铁矿为微细粒嵌布, 二者嵌连关系紧密; 采用磨矿-强磁选, 可脱除TFe品位7.57%、产率49.40%的尾矿; 将磁选精矿细磨至-0.037 mm粒级含量98.64%, 在矿浆pH值11.6、矿浆浓度34.6%、腐殖酸钠用量0.5 g/L条件下进行四段选择性絮凝脱泥, 可脱除TFe品位12.20%、作业产率31.20%的矿泥。通过磁选-选择性絮凝脱泥大幅提高了反浮选的入选品位、降低了矿石处理量。     

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。