粉碎方式对TiO2粉体的影响

为了研究研磨作用方式对粉碎样品的粒径和晶型转变的影响,以汽车颜料TiO2为原料,分别用离心环隙式磨机和QM-BP型行星式球磨机对质量分数为30%的TiO2进行了湿法超细粉碎试验。XRD分析结果表明:离心环隙式磨机粉磨6h,近90%的锐钛矿型TiO2转变成金红石型TiO2,且粒径达到22.9nm。而行星球磨机粉磨20h,其粒径仅达到86.5nm,且无晶型转变。研究结果表明:新型机的特殊研磨方式不仅能够获得纳米级的颗粒,而且通过机械力化学效应使TiO2的相变温度从900℃降到100℃以下。     

亚微米碳化硅超细粉碎实验研究

通过实验研究,对碳化硅用搅拌磨粉碎形式下的粉体粒度、粒度分布、比表面积叶应研磨时间的相互关系进行了分析.对实验数据进行回归分析拟合,得出了搅拌磨超细粉碎过程中的粉体中位径与比表面积、中位径与研磨时间、粒度分布与研磨时间的函数关系模拟方程式.理论计算曲线与实验数据吻合程度很好.根据推导出的函数关系方程式,可以预测碳化硅搅拌磨超细研磨过程中的产品性能,为实际生产放大模拟提供了理论依据.     

基于数值仿真的大型塔式磨机工作特性分析

针对大型塔式磨机在设计阶段驱动功率、螺旋主轴应力和出料粒度分布(PSD)等指标的预测不准确问题,提出了基于流固耦合(CFD-DEM)联合仿真的塔式磨机工作过程数值模拟方法,对工作过程中研磨介质运动分布、力链分布、碰撞谱以及驱动功率进行分析,并将载荷信息作用到有限元模型中对磨机螺旋主轴应力状态及分布进行计算;此外,建立塔式磨机磨矿过程的数学模型,以分析不同工艺参数对磨矿效果的影响。通过实测不同装球量条件下的驱动功率验证了流固耦合仿真结果的正确性,并通过一系列磨矿试验确定了数学模型中的关键参数。分析结果表明:研磨介质尺寸、填充量以及螺旋搅拌器速度等参数是影响塔式磨机作业性能的主要因素。     

立式搅拌磨机正多边形筒形结构研究

针对截面为正多边形的球磨机研磨筒进行结构研究,利用EDEM软件分析介质球在各种形状研磨筒内的运动特性,得出截面为正八边形的研磨筒能量利用率最高,单位时间内介质球的有效碰撞次数最多等结论.与传统圆柱形筒体进行实验对比,截面为正八边形的研磨筒磨矿产物中-200目矿料明显增加,提高了磨机破碎率和能量转化率,进而降低了磨矿能耗和生产成本,为立式搅拌磨机的结构优化提供参考.     

用于加工超细粉的MGZ型振动磨机的设计原则

本文通过对超细粉体的产品特性与被研磨物料的破磨特性分析，研究了不同物料破磨方式的差异，以及与磨机特性的关系，提出了MGZ型振动磨机加工超细粉体时的设计原则。     

磨机种类、水介质和机械热效应对粉煤灰研磨的影响

研究了振动磨和高速快速磨研磨粉煤灰的过程,对有、无水介质的快速研磨和有、无恒温振动条件的振动研磨结果进行了比较。通过对研磨处理后不同时间粉煤灰的粒度分析,揭示了不同磨机产生不同研磨效果的原因。针对粒度分析结果,从结构分析角度讨论了水介质的-OH基因影响和机械热效应导致的粉煤灰颗粒结构变化。     

差速搅拌捏合机三维流场的数值模拟分析

利用UG软件建立差速搅拌捏合机的流场仿真模型,用Fluent软件对其进行数值模拟分析,得到物料在差速搅拌捏合机流场内压力值、流动速率、最大剪切应力的分布以及物料形态的变化规律。结果表明,在两搅拌轴捏合区域处流体压力值最大,剪切应力值最大,且清洁轴表面的流体速度要高于主搅拌轴上的流体速度,中心距对搅拌机的性能有重要影响。     

倾斜隔仓板磨机筒体无纵向位移的条件

在装有倾斜隔仓板磨机的运转过程中，由研磨体产生的纵向力生地作用到磨机筒体上，使磨机筒体沿其纵向轴线移动，从而对磨机造成破坏，本文通过研究筒体所在轴承座中的摩擦力，得到了筒体无纵向位移的必要与充分条件。     

磁力研磨加工的数值仿真

为了提高磁力研磨加工效率，通过建立研磨压力模型和研磨量模型对磁力研磨加工进行数值仿真，总结出磁感应强度、加工时间、工件转速及工件的进给速度等工艺参数对磁力研磨加工效率的影响规律．同时对仿真结果和实验结果进行对比和分析，证明所建模型正确．     

研磨体沿倾斜隔仓板运动轨迹的研究

研究了倾斜隔仓板管磨机中研磨机中研磨体沿倾斜隔仓板的运动轨迹,讨论了研磨体在倾斜隔仓板上的运动特性及对磨机工作效率的影响。     

振动磨机介质运动规律研究及工作参数的计算方法

通过对MZS型振动磨机磨筒内介质运动运动规律的观察研究，建立了一个简单的介质运动学模型，并根据所建立的模型计算了振动磨机的一些重要参数，如：振幅、介质填充率、介质直径等工作参数的最佳取值范围，从而使振动磨机获得最佳粉磨效果和降低能耗。     

Computer Simulation of Batch Grinding Process Based on Simulink 5.0

How to use Simulink software in grinding system was studied. The method of designing batch grinding subsystem and the steps of building batch grinding blockset were introduced. Based on batch grinding population balance model, batch grinding was simulated with Simulink. The results show that the simulation system designed with Simulink explain reasonably the impersonal rule of batch grinding. On the basis of batch grinding simulation, the computer simulation of mineral processing system with Simulink of grinding and classification, comminution, etc, can be properly explored.     

超音速气流粉碎机等流能喷嘴计算

本文应用定常二维无旋超音速流的数值方法——特征线法分析了超音速气流粉碎机的喷嘴流动,给出了设计等流能喷嘴管壁型线的计算方法.     

钢渣粉磨技术探讨

针对目前我国钢渣利用率不高,利用层次低的现状,在分析钢渣理化性质和传统的钢渣回收利用技术缺陷的基础上,根据"料层粉磨"原理,提出了一种用卧辊磨粉磨钢渣的技术。重点研究卧辊磨的结构、粉磨原理以及制备钢渣粉的工艺流程,结果表明:卧辊磨粉磨钢渣具有工作压力小、效率高、节能等优点。     

Pre-treatment of rocks prior to comminution——A critical review of present practices

It has been an established fact that comminution processes, crushing and grinding, are most energy intensive processes which account for more than half of the total energy consumed in mineral industries.Various alternative pre-treatment methods have been tried by experts around the globe. Although these methods yielded positive results in terms of reduction in energy consumption in crushing and particularly, in grinding operations at laboratory scale, their industrial application still remains an unresolved issue and challenge. Present review paper describes each one of these methods along with outcome of earlier studies and issues that need to be addressed through further rigorous experimental investigation.It also suggests the direction in which future studies can be carried out to meet the primary objective of making comminution processes more energy efficient than today they are.     

Use of drilling performance to improve rock-breakage efficiencies: A part of mine-to-mill optimization studies in a hard-rock mine

In a hard-rock mine, blasting is an important rock-breakage process that impacts energy consumption both in downstream comminution processes and mine productivity. Optimizing the blast fragmentation to improve rock-breakage efficiencies during crushing and grinding is key to mine-to-mill(MTM) optimization. This study explores the use of monitoring while drilling(MWD) data to achieve this goal.Representative penetration rates(PRs) were extracted from blastholes to estimate intact rock properties and predict the breakage efficiencies that directly affect comminution energy consumption. Two intact rock properties, tensile strength(TS) and Bond work index(BWI), were correlated with the PR data to predict these efficiencies in crushing and grinding, respectively. Because of the complexity of the raw MWD data and effects of various disturbances, the MWD data was preprocessed and normalized to achieve a representative PR value at each blasthole. This preprocessing entailed defining valid PR ranges from the MWD data that could eliminate the noise related to discontinuity features in the rock mass structure as well as errors in operator behaviors. The PR data was also normalized using the adjusted penetration rate(APR) to minimize the effects of mechanical factors such as drill feed force, torque, and rotational speed. To correlate the representative APR value with intact rock properties, TS and BWI, various laboratory experiments were conducted: drilling tests using a high-precision coring machine, Brazilian disc tests, and Bond grindability tests. Based on the results of these experiments, models were developed to predict rock-breakage efficiencies during crushing and grinding based on APR. The result of this study can be used to obtain blast energy designs that consider comminution energy consumption and efficiency in the downstream rock-breakage processes.     

行星式球磨机机理及磨碎试验研究

行星式球磨机可以用于超细磨矿。磨机的结构尺寸一旦确定,磨球脱离筒壁的临界转速脱离点位置则不会改变。影响磨矿的特性参数有转速、球粉比、球配比和磨矿时间(能量输入)等。当球粉比为0.7至0.75,球料总体积为磨筒容积的2/3左右时,磨碎效果好;球磨机的钢球搭配方式不适合于行星磨;当磨机的公转转速高时尤其适合于磨碎硬和特硬物料。     

Analysis of chamber effect on intermittent pulsation

A numerical study was conducted to seek an optimized dimension of jet chamber in the pulsating impinging flow.The flow and heat transfer effect of the pulsation flow through a jet chamber was investigated.The numerical results indicate that heat transfer effective enhances near the stagnation region for the intermittent pulsed flow with jet chamber compared to that without jet chamber.Simulations of the flow through a jet chamber show that the heat transfer rate on the impingement surface is highly dependent on the velocity at the position which is really close to target surface.Examination of the velocity field suggests that the velocity exists a maximum value as the axis distance increases.In addition,the velocity at the jet hole is enlarged by the jet chamber due to the entrainment effect,and the velocity is amplified even greater as the size of the jet chamber becomes bigger.Nevertheless,the velocity declines quickly while the flow axis distance is more than a certain range,leading to poor heat transfer.Thus,intermittent pulsed flow with jet chamber is suggested as a method of improving heat transfer by employing larger dimensions of jet chamber for appropriate jet-to-surface spacing.     

论物料的湿法超细粉碎

本文根据几年来的实践,论述了物料湿法超细粉碎的特点,提出了提高超细粉碎效率的途径:包括对物料施加快速高频外力;高浓度下加压粉碎;强化分级、窄级别磨矿;添加表面活性剂及选择合适的粉磨设备。     

Specific Properties of Air Flow Field Within the Grinding Zone

1 Introduction Grinding is a precision machining process ,whichis widely usedin manufacturingindustry.Today, modernindustrial production depends to a large degree on grinding machines[1 ,2]. Agood case in point is that ceramicmaterial ,one kind of engineering materials ,can be manufactured only by grinding.Toi mprove the manufactur-ing efficiency,one usual wayis toincrease the rotating speed of grinding wheel ,namely,toincreaseits periph-eral velocity. However , not only the temperature of gr…