西石门铁矿采用大块磁选机的设计与应用

通过对西石门铁矿采用大块干式磁选机的设计和选矿生产实践的讨论，分析了设计和生产中存在的问题及其解决办法，提出研制大块矿石脱磁器，使矿石在自磨前脱磁，是彻底解决磁团聚对选矿生产影响的重要途径。     

磁选降磷在梅山铁矿选矿厂的应用

分析了梅山铁矿选矿降磷的迫切性，根据多方案对比试验比选，确定弱磁－强磁流程作为选矿厂降磷改造流程，并介绍了流程经改造后在生产中取得的效果     

Effect of magnetic field orientation on high gradient magnetic separation performance

The magnet has a dominant role in a high gradient magnetic separator; it provides the passage for the magnetic field and the working space where the matrix is placed to produce magnetic gradients and magnetic forces high enough to capture magnetic particles from the slurry. The effect of the magnetic field orientation of the magnet on high gradient magnetic separation (HGMS) performance has been comparatively investigated on a pilot pulsating HGMS separator with vertical and horizontal magnets respectively. The results of the investigation indicate that the magnetic field orientation has a significant effect on the performance. It was concluded that a properly designed magnet in a HGMS separator greatly improves the performance.     

Windimurra钒钛磁铁矿综合回收试验研究

简述了Windimurra钒钛磁铁矿主要金属元素的赋存、主要矿物组成及矿物含量。磁选条件试验确定了该矿的试验磁场强度(磁选粗选、扫选磁场强度为280kA/m、350kA/m)和粒度(-0.5mm),并进行了一粗一扫一精、扫选精矿同精选尾矿合并后再磁选流程的闭路试验,最终获得了产率为41.93%,TFe、TiO2、V2O5品位分别为52.14%、18.52%、1.04%,TFe、TiO2、V2O5回收率分别为72.26%、83.30%、82.43%的钒(铁)精矿,对钛磁铁矿(包括钛磁赤铁矿、钛赤铁矿和钛磁铁矿)和钛铁矿矿物的回收率分别为84.32%、84.85%,能有效地回收该资源中的铁、钛、钒。     

铁矿资源优势的发挥与“一步法”直接还原

从我国目前国情出发,论述了利用优质磁选铁精矿生产高附加值的直接还原铁的合理性和提高企业经济效益的可行性。“一步法”直接还原在较小的规模（小于１５０万ｔ／ａ）下具有明显的优越性,是适合我国目前情况的一种直接还原铁生产工艺。     

新型干式永磁筒式磁选机风力因素分析

为了探究风力因素对分选腔流场特性、磁选机分选性能的影响,将借助计算流体力学软件ANSYS fluent对新型干式永磁筒式磁选机分选腔进行流场特性研究,并通过整机试验研究风力因素对分选性能的影响.研究结果表明,随着风速的增加,精矿铁品位由17.78％提升到19.63％,尾矿磁性铁品位由1.09％降低到0.77％,精矿产能...     

永磁中磁场湿式筒型磁选机及其应用

介绍了YZJ型永磁中磁场湿式筒型磁选机的设备结构及技术特性。在齐大山选矿厂重-磁-浮阶段磨选工艺流程中的应用情况表明,该机除具有磁场强度大的特点外,还有磁场作用深度大,适应性强,处理能力大,选别指标好等优点。     

磁选联合工艺选别0.5～0mm铁矿石的生产应用

介绍了弱磁 -中磁 -强磁工艺流程在梅山选矿厂选别细粒级矿石的应用情况 ,计算了取得的经济效益 ,并就生产中应注意的问题提出了若干建议。     

In situ observation of quartz particles entrained into magnetite coagulates in a uniform magnetic field

The entrainment of fine quartz particles into magnetite coagulates in a uniform magnetic field was studied through in situ observation using a video microscope. It is shown that the mechanisms for this entrainment are attributed to the magnetic coagulation of locked quartz-magnetite particles with free magnetite particles, the entrainment of free quartz particles into magnetite pearl chains, and wrapping of magnetite circular chains round free and locked quartz particles.     

CFD–DEM modelling of particle ejection by a sensor-based automated sorter

The efficiency of sensor-based automated sorting depends on both correct identification and separation of different types of particles. It is known that the distribution of particles fed to the sorter will affect both of these. When different particles are in close proximity, they can be “agglomerated” or seen as a single particle during identification and also have an increased probability of being unintentionally co-ejected. Both factors will have a negative effect on separation efficiency.The aim of this work was to model the air ejection manifold of a sensor-based automated sorter and to investigate the relationship between particle proximity and unintentional co-ejections. The airflow from a single air ejection valve of a sorter was modelled using computational fluid dynamics (CFD) software and calibrated against a Tomra Sorting Solutions optical sorter. It was found that the air ejection manifold could be accurately represented in CFD code. Particles were modelled using the discrete element method (DEM) software and the effect of particle position, relative to an air ejection valve, on accurate ejection was examined using an integrated CFD–DEM model. The results of these models matched reasonably well with physical measurements. The models created can be used as a basis for the prediction of sorter efficiency.     

An improved process for China clay beneficiation using high-gradient magnetic separation

This paper describes the results of tests using vibration high-gradient magnetic separation for upgrading of china clays.     

Investigating the effect of slag bath conditions on the existence of multiphase emulsion zones in PGM smelting furnaces using computation fluid dynamics

The presence of chrome in electric arc furnaces smelting platinum group metals (PGM’s) has a number of potentially negative consequences. In cases where the slag chrome content is above the saturation limit the existence of near-stagnant conditions near the slag/matte interface increases the risk of chromite spinels settling and consolidating into a “mushy layer”, a three-phase suspension of slag, chromite and matte. The hold-up of matte above the elevation of the slag/matte interface can lead to the attack of freeze linings and copper cooling elements potentially causing failures of the furnace lining and significant downtimes as well as major safety risks. This paper investigates the relationship between typical furnace operating parameters and the behavior of the slag bath with respect to the formation of the “mushy” layer at the slag/matte interface using computational fluid dynamics (CFD). The extent of the potential “mushy” layer is seen to increase with decreasing electrode immersion and furnace power. Electrode immersion is, however, a considerably stronger driver is this regard. The CFD modelling results have aided in selecting appropriate furnace electrode immersion/power combinations intended to minimize “mushy” layer formation.     

A Stokesian dynamics approach for simulation of magnetic particle suspensions

The dynamic behaviour of μm-scale ferromagnetic particles in suspension is of interest for various mineral beneficiation processes. It is, however, difficult to experimentally study such processes at the particle-level. In these instances it can be advantageous to resort to suitable particle simulation methods.Stokesian dynamics is a mesh-free numerical technique developed for suspensions of nm to mm size particles. The method inherently considers hydrodynamic interactions, but additional interaction models can be included depending on the system under investigation. We here present a Stokesian dynamics (SD) implementation, which allows for simulation of the motion of suspended magnetic particles in presence of an external magnetic field. The magnetic interaction model includes particle-field interactions as well as pairwise interactions between magnetised particles.Simulations are compared with experiments using a laboratory-scale flow cell. The method is shown to be realistic for studying ferromagnetic suspensions in mineral processing applications, and can be useful in understanding and predicting the efficiency of mineral separation processes.     

铁精矿提铁降硅的捷径--磁团聚重选新工艺的应用和效果分析

介绍了磁聚机的结构及磁团聚重选新工艺特点、磁场特性、选别原理及其应用效果。经过多年的生产实践表明，磁团聚重选新工艺有效解决了单体有用矿物与贫连生体的分离问题。在保持相同磨矿粒度的条件下，可提高铁精矿品位2个百分点左右；在保持相同铁精矿品位条件下，可放粗粒度，并提高球磨机台时处理能力。该新工艺是选矿厂提铁降硅及实现提高铁精矿品位的有效手段，可进一步大力推广应用。