提高球磨机磨矿效率技术措施

为解决选矿厂普遍存在的磨矿效率偏低,进而影响和制约经济效益的问题,从分析影响球磨机磨矿效率的各种因素入手,通过论述相关因素影响作用和球磨机磨矿效率的机理,提出了提高球磨机磨矿效率的技术措施。生产实践表明,提高球磨机磨矿效率的技术措施可有效提高磨矿效率,增加选矿厂经济效益。     

生产中提高球磨机磨矿效率的方法

磨矿作为选矿厂不可或缺的一环,对选矿厂的选别指标有着至关重要的影响。磨矿效率的好坏更是与选矿厂的经济效益息息相关。剖析阐述了实际生产中影响球磨机磨矿效率因素,从而分析在生产中如何有效的提高磨矿效率。     

生产中提高球磨机磨矿效率的方法

磨矿作为选矿厂不可或缺的一环,对选矿厂的选别指标有着至关重要的影响。磨矿效率的好坏更是与选矿厂的经济效益息息相关。剖析阐述了实际生产中影响球磨机磨矿效率因素,从而分析在生产中如何有效的提高磨矿效率。     

球磨机有功功率和磨矿效率影响因素研究

通过对球磨机球料比、介质充填率和磨矿浓度与有功功率和磨矿效率试验, 分析了影响球磨机功率和磨矿效率的主要因素, 建立了球磨机内部状态(球料比、介质充填率和磨矿浓度)与外部参数(有功功率、磨矿效率)之间的关系, 提出了改善磨矿效率的合理操作参数。在一定磨矿条件下磨机有功功率与磨矿效率有明显对应关系, 而且是判断磨矿效率的重要参数之一。     

基于PFC3D的球磨机磨球运动规律的研究

为了更好地运用球磨机磨介的运动规律来提高磨矿效率,建立了卧式球磨机离散元模型,并利用三维离散元软件PFC3D对球磨机磨介运动进行了数值模拟,研究了影响球磨机磨球运动规律的因素,根据试验设计理论对球磨机转速、衬板高度和衬板截面形状三因素进行了模拟试验,利用回归分析法获得较优方案。结果表明:当滚筒的角速度为2.25 rad/s,衬板高度为75 mm和衬板侧面的角度为(π/48)rad时,磨球冲击速度最大,球磨机的磨矿效率最好,并且球磨机的横向振幅最小。     

球磨机磨矿效率影响因素分析

磨矿效率是衡量磨机生产综合性能的重要的参数指标,本文综合论述了入磨矿石粒度、磨矿介质、矿浆流变特性、磨矿浓度、返砂比、磨机衬板、助磨剂等因素对球磨机磨矿效率的影响,并要求磨矿生产过程应具有较高的自动化水平。     

提高姑山矿红矿系统磨矿效率的途径

从物料性质、磨矿浓度、分级机溢流浓度、球磨机磨矿介质等方面入手,介绍了提高姑山矿红矿系统球磨机磨矿效率的途径。     

提高姑山矿红矿系统磨矿效率的途径

从物料性质、磨矿浓度、分级机溢流浓度、球磨机磨矿介质等方面入手,介绍了提高姑山矿红矿系统球磨机磨矿效率的途径。     

某铅锌矿磨矿分级循环系统降比提效试验研究

针对国内某铅锌选矿厂磨矿分级循环系统的循环负荷高、水力旋流器分级效率和球磨机磨矿效率低等问题,对现场磨矿分级系统进行流程考察和问题诊断,对试验样进行了岩矿性质测定和工艺矿物学研究,基于矿石碎磨特性开展了球磨机磨矿介质尺寸和级配的理论计算、实验室磨矿对比试验、工业应用试验。球磨机介质级配优化后,磨矿分级系统中-0.074mm粒级的返砂比由试验前的467.19%降至224.66%,分级量效率由试验前的52.26%提高至68.34%,分级质效率由试验前的46.72%提高至57.21%,磨机-200目利用系数由0.24t/(m3·h)提高至0.40t/(m3·h),磨机磨碎+0.15mm粗粒级效率由21.95%提高至38.09%,实现了磨矿分级系统中球磨机和分级机效率双提升。     

搅拌磨机在弓长岭选矿厂细磨作业中的应用

针对弓长岭选矿厂再磨球磨机磨矿效率低、能耗大等问题开展了陶瓷球专用搅拌磨机代替球磨机的工业试验。试验结果表明，搅拌磨机磨矿粒度更细，排矿中-0043 mm含量比球磨机提高721个百分点；磨机电耗成本下降5026%，介质球添加量下降936%，介质成本下降5561%；单系列搅拌磨机比球磨机年节省磨矿成本18021万元。搅拌磨机磨矿效率较球磨机大幅提高，磨机利用系数从0465 1 t/（h·m3）提高到1042 3 t/（h·m3），搅拌磨机与球磨机相比具有明显的经济效益。     

Prozessintegriertes Trocknen von Rohwaren in den Werken der Luzenac Naintsch Mineralwerke GmbH

Process chain optimisation at the Luzenac Naintsch production sites enabled to dry the ore almost without use of primary energy. Main parts of production are dried without additional energy during the mechanical milling process carried out on roller mills, ball mills as well as on jet mills. In case a separate drying before the fine sieving process is necessary, the drying is done by using waste heat out of other processes.     

优化选矿工艺,提高选矿综合效益

篦子沟铜矿通过优化选矿生产工艺 ,采取减少排矿口间隙、调整三段破碎比、提高入磨产品粒度、增加钢球充填率、改变浮选流程等措施来达到 3台球磨机处理原 4台球磨机的生产量。通过改造 ,球磨台效由原来的 3 6t/h提高到 42t/h以上 ,预计年增效益 110 73 5 8万元 ,并能安排 12名下岗工人。     

Comparison of energy efficiency between ball mills and stirred mills in coarse grinding

Stirred mills are primarily used for fine and ultra-fine grinding. They dominate these grinding applications because greater stress intensity can be delivered in stirred mills and they can achieve better energy efficiency than ball mills in fine and ultra-fine grinding. Investigations were conducted on whether the greater performance of stirred mills over ball mills in fine grinding can be extended to coarse grinding applications. Four different laboratory ball mills and stirred mills have been tested to grind seven ore samples with feed sizes ranging from 3.35 mm to 150 μm. A case study on full scale operations of a 2.6 MW IsaMill replacing the existing 4 MW regrind ball mill at Kumtor Gold Mine in Kyrgyzstan is also included. This paper summarizes the major findings from these investigations.     

Analysis of specific discharge rate functions in industrial scale cement grinding multi-compartment ball mills to assist ball mill modeling

Specific discharge rates in industrial scale multi-compartment cement grinding ball mills were determined using industrial scale data to assist modeling of multi-compartment ball mills. Multi-compartment ball mill model structures were proposed to estimate normalized specific discharge rate functions. Multi-compartment mills were divided into perfectly mixed mill segments to describe material transport mechanism in the mill. Specific discharge rate functions were determined by using the estimated mill hold-up for perfectly mixed mill segments at the steady state condition of the cement grinding circuits. Estimated normalized discharge rate functions were found to be different than the basic pattern observed in semi-autogenous mills due to the differences in design and operational conditions of the mills. Coarse particle accumulation was found to have a significant effect on discharge rate function pattern. Estimated normalized discharge rate functions could be used in modeling of multi-compartment ball mills.     

球磨机钢球大小的试验研究

铜山矿分别在2台球磨机上进行加大钢球的生产试验,结果平均处理量增加,钢球单耗降低,用电单耗降低,与理论计算基本相符。现用各种磨机普遍存在充填率少、钢球(棒)小、转速低的问题,在增加充填率和加快转速的改造中,加大钢球(棒)更能获得巨大的经济效益。     

Modeling ball impact on the wet mill liners and its application in predicting mill magnetic liner performance

Numerous studies have been conducted in the past and models have been developed to simulate ball motions in horizontal mills. Equations and computer programs have been published to calculate falling velocity of the grinding media upon impacting the mill shell (liner). However, these equations and programs are only suitable for dry mill applications.To accurately simulate the impact of falling balls on the liners in wet mills, the authors have developed models to determine the ball impact location and velocity as the ball contacts the mill liner. Drag and buoyancy forces are considered when the ball submerges in the pulp inside the mill. Models can be used to enhance mill liner design and optimize the operation of horizontal wet mills such as horizontal ball mills.The models are applied to calculate the falling ball impact on the metal magnetic mill liners. Various scenarios are simulated and results are used to predict the performance of magnetic mill liners in various ball mill applications.     

Modelling the influence on power draw of the slurry phase in Autogenous (AG), Semi-autogenous (SAG) and ball mills

The slurry level in AG/SAG and ball mills has an influence on their power draw, which in some instances can be profound. This is particularly the case with so-called slurry pooling in AG/SAG mills which can result in significant lowering of power draw. From a predictive viewpoint there are currently no published models that explicitly describe the influence of slurry level on power draw and the relationship between slurry level, slurry flow and pulp lifter design. Citic SMCC Process Technology Pty Ltd has developed such a model and in this paper its structure is described. Examples are given of both AG/SAG and ball mills of how the model responds to changes in slurry level. These examples are used to explain the observed phenomena of slurry pooling and the decrease in power draw observed in ball mills after start-up when feed is first introduced into the mill.     

橡胶衬板在特大型球磨机中的应用

介绍了德兴铜矿大山选矿厂球磨机 ( 5 .5 m× 8.5 m)使用橡胶衬板的情况 ,与锰钢衬板对比的考查结果及在生产实践中发现的优缺点。     

浅谈球磨机在金川选矿厂的应用现状和发展趋势

简要介绍球磨机的发展状况以及金川选矿厂球磨机的应用现状,根据目前金川选矿厂技术改造或扩建中采用球磨机的性能特点,归纳出金川选矿厂今后将采用大型化、高可靠性的球磨机,并实现球磨机的计算机自动控制。     

On the comparison between measured and calculated stresses in large SAG mills

A study of the structural design of large SAG mills is presented. Stress ranges from strain gauge measurements are compared with those calculated using finite element models for two mills. The agreement between measurement and calculation for one mill is substantially better than it is for the other. The cause of the discrepancy in agreement between measurement and calculation for the two mills is determined to be the relative percentage of ball charge to total charge. For lower total charge to ball charge ratios, the pressure on the heads or end walls of the mills reduces dramatically. As this ratio increases, the pressure on the heads increases to approach a hydrostatic load. The problem of poor agreement between mill finite element models and fatigue design codes is thus partially resolved.