仿真优化技术在立式行星磨设计中的应用

北京科技大学在对立式行星磨进行系统动力学分析的基础上，应用机械动力学仿真软件ADAMS建立了立式行星磨的模型，并且进行了仿真优化。     

立式行星磨系统动力学分析

介绍了立式行星磨的工作原理，建立了设备机械系统的力学模型，对系统的运动学和动力学特性进行了初步分析，并给出相关的计算公式，为立式行星磨的设计与制造提供了理论依据。     

基于虚拟样机的立式行星磨仿真的研究

立式行星磨是我院与加拿大多伦多大学化工系联合研制的一种新型行星式磨机。该磨机设计独特，结构紧凑，使被磨物料能够最大限度的利用输入的能量进行粉碎，避免了普通磨机和振动磨机工作中介质之间的无效空磨，使得立式行星磨的单位容积处理量比具有同样磨矿效果的球磨机的单位容积处理量高约40倍。为了更好地分析和研究该系统并达到优化系统的目的。本文基于虚拟样机技术对立式行星磨机运动性能和力学性能进行了研究。     

基于相似理论的立式行星磨仿真可信度研究

从相似理论的角度,认为在虚拟样机建模中存在着大量的相似问题,以相似理论为基础对立式行星磨虚拟样机和实际系统相似要素和两系统相似程度进行了量化,并对可信度进行了深入的研究和判定,认为设备虚拟样机开发有效。     

基于相似理论的立式行星磨仿真可信度研究

从相似理论的角度,认为在虚拟样机建模中存在着大量的相似问题,以相似理论为基础对立式行星磨虚拟样机和实际系统相似要素和两系统相似程度进行了量化,并对可信度进行了深入的研究和判定,认为设备虚拟样机开发有效。     

HRM立式磨在脱硫粉磨石灰石的使用

本文介绍了HRM立式磨在火电厂脱硫工艺的应用,对比了几种不同脱硫工艺及设备的优缺点,并对其工艺系统和实际运行效果进行了分析探讨和研究,为立式磨开拓了新的应用领域,为火电厂脱硫工艺领域内立式磨的开发和应用提供了借鉴,为火电厂脱硫节能降耗开辟了新的途径.     

立式螺旋搅拌磨矿机的研制及其在钼矿再磨擦洗作业中的应用

介绍立式螺旋搅拌磨矿机(塔磨机)的基本结构和工作原理,采用计算机流场数值模拟技术与传统力学分析相结合的放大设计原则设计了大型立式螺旋搅拌磨矿机。着重叙述了该设备在钼矿再磨擦洗工艺流程中的应用,通过提高钼矿细度和清洁钼矿表面,进一步提高了钼矿的单体解离度,为浮选作业提供了良好的选别环境,明显提高其精矿品位和回收率。工业实践证明立式螺旋搅拌磨矿机是一种性能优越的再磨、细磨和擦洗设备。     

ANSYS Workbench在带式输送机传动减速器瞬态动力学分析

以某型号带式输送机中的行星减速器作为研究对象,采用ANSYS Workbench的Trancient Structural分析模块,对其进行瞬态动力学分析仿真。建立带式输送机行星减速器三维接触非线性有限元模型,添加材料属性、划分有限元、定义接触、输入载荷边界条件及编辑计算控制栏等,对其进行瞬态动力学研究。研究齿轮在啮合过程中产生的冲击,材料的应变随时间的变化过程,齿轮啮合副在工作时的应力、应变分布情况,以及在不同工况条件下行星减速器系统的应力、应变、速度及加速度在变化工况下随时间的响应情况等。     

基于PLC的卧式行星磨粉磨系统

采用西门子S7-300系列可编程控制器(PLC)对某公司卧式行星磨粉碎滑石中试生产线进行了自动化改造,同时对带式输送机、斗式提升机、卧式行星磨和选粉机进行了数据采集和监控,并对生产线进行了调试。结果表明,粉磨系统运行稳定,减轻了工人的劳动强度,而且粉碎工艺得到了进一步的优化。     

立式螺旋搅拌磨矿机在铁精矿再磨中的应用

介绍了立式螺旋搅拌磨矿机的基本结构和工作原理,着重叙述了该设备在铁精矿再磨再选工艺流程中的应用。工业生产证明了立式螺旋搅拌磨矿机是一种性能优越的再磨、细磨设备。湖南柿竹园有色金属矿尾矿经JM800B型立式螺旋搅拌磨矿机磨矿,细度达到-38 μm占95.10%,磁选为一次粗选、二次精选,可获得铁精矿品位达65.20%,有效地回收了铁矿资源。     

秦皇岛某微细粒铁矿搅拌磨细磨—磁选工艺试验研究

采用立式搅拌磨机作为微细粒级矿物的再磨设备,以秦皇岛地区微细粒级铁矿为试验样品,进行了磨矿及磁选条件试验研究,结果表明,磨矿产品粒度达到-0.038 mm占95.43％,经一次粗选和两次精选可以获得产率66.12％、磁性铁品位为64.06％、回收率为97.16％,全铁品位为65.94％的优质铁精粉.磨机磨矿电耗测试表明...     

行星球磨机磨球运动规律的研究

行星球磨机中磨球的运动规律主要由离心力决定。通过绘制磨球在球磨罐内不同位置所受离心力的分布情况，分析了磨球相对于球磨罐的运动轨迹，研究了球磨罐公转速度、自转速度、半径及磨球大小对磨球运动的影响，得出同时提高球磨罐的公转速度和自转速度或采用大直径的磨球可显著增强粉磨效果的结论，为行星磨操作参数的选择提供了理论依据。     

Direct mechanochemical conversion of celestite to SrCO3

The celestite concentrate obtained from Barite Mining Company (Sivas-Turkey) was converted to strontium carbonate using sodium carbonate in a planetary ball mill operated both in dry and wet modes. After wet planetary milling of celestite concentrate and sodium carbonate mixture, solid strontium carbonate and soluble Na₂SO₄ were obtained. The conversion reaction were followed by dissolution and sulphate analyses after high-energy milling operations. The 10, 20 and 40 min of wet milling experiments were performed in a planetary mill and the results showed that over 90% of dissolution and conversion of initial celestite to strontium carbonate was achievable by high-energy milling.     

The generation of toxic reactive oxygen species (ROS) from mechanically activated sulphide concentrates and its effect on thermophilic bioleaching

Two types of laboratory mills, planetary and vibratory, were used to activate sulphide mineral concentrates mechanically before thermophilic (bio)leaching. These samples were analysed in terms of particle size, surface area, density, SEM, XRD line profile analysis and reactivity. The product particle size distributions indicated different particle breakage mechanisms of the two mills. The surface area for pyrite milled with the planetary mill was three fold that milled in the vibratory mill for the same length of time. Planetary milled samples showed lower densities, up to 4% less for pyrite samples, compared to vibratory milled samples. Particle surface oxidation, observed by SEM, occurred post milling. Surface oxidation products were more prevalent with planetary milled sulphide samples. XRD line profile analysis showed more line broadening effects with the planetary mill. This indicated that more bulk particle-related structural defects were present in the planetary milled samples. The reactivity in acidic solution was measured in terms of the generation of toxic reactive oxygen species (ROS): hydrogen peroxide and hydroxyl radicals. The ROS generation from milled sulphides, normalised to constant surface area loading, increased with increased mechanical activation. The planetary milled samples generated greater ROS per sample surface area than vibratory milled samples, more than 4-fold for pyrite after 60 min of milling. Increased ROS generation was postulated to result from increased surface area defects, solubilisation of iron oxidation products and bulk particle-related defects.The effect of mechanical activation on performance on thermophilic leaching and bioleaching tests was investigated using milled samples at 2% (w/v) pulp density. Short mill times improved leach rates from both mills, up to 7-fold cf. unactivated feed leach rates. Poor bioleaching performance resulted following long periods of mechanical activation (20-60 min). Pyrite and chalcopyrite bioleaching performance decreased dramatically above surface area loadings of 25 and 125 m²/L respectively. Planetary milled samples were less amenable to bioleaching. For pyrite milled for 20 and 60 min and chalcopyrite milled for 40 min, no viable cells were observed following inoculation via fluorescence microscopy, suggesting culture death supported by compromised ferrous iron oxidation. The generation of ROS was postulated to cause poor bioleaching performance under these conditions.     

Production of mechanically activated rock flour fertilizer by high intensive ultrafine grinding

This paper provides a first assessment of the use of mechanical activation to enhance the availability (i.e., leachability) of potassium from K-feldspar containing materials for soil improvement and agricultural purposes. A planetary mono mill was used to achieve high intensive dry grinding of both a K-feldspar concentrate and a nepheline syenite concentrate that served as a reference material. The K-feldspar concentrate was also milled in a pilot-scale HiCOM 15 nutating mill. The mill products were characterised with respect to their size distributions, specific surface areas and their relative degree of structural disordering as calculated from X-ray diffraction analysis. The enhanced solubility of the products in terms of potassium was determined directly through a three-step cascade leaching test. The results show that high intensive dry grinding could be used to increase the release of potassium from K-feldspar containing materials by more than an order of magnitude. When subjected to planetary milling, less than 10 min of milling was required to make the K-feldspar mineral more reactive than the intrinsically more soluble nepheline. The enhanced reactivity of the mill products is predominantly a function of their specific surface areas, but a significant part of the observed increase in reactivity must be attributed to structural disordering. The use of water as a grinding aid makes it possible to produce very reactive structurally disordered products with high specific surface areas.     

立式辊磨机对菱镁矿磨矿及浮选效果的影响

立式辊磨机是一种集中碎、粉磨、快速烘干、高效选粉等工序为一体的高效节能环保型设备,具有结构 简单紧凑、工作可靠、流程简单、占地面积小等诸多优点。 针对丹东宽甸某菱镁矿,分别进行立式辊磨机与球磨机磨 矿—浮选试验,通过对比磨矿能耗、磨耗、磨矿产品粒度特性、矿浆中 Fe3+浓度等数据,并比较了药剂制度对闭路试验 精矿指标的差异。 结果表明:立式辊磨机磨矿的能耗仅为球磨机磨矿能耗的 17%左右,立式辊磨机的磨耗约为球磨 机磨耗的 6%左右,同时立式辊磨机磨矿产品中有利于浮选的中间粒级(0. 105~ 0. 045 mm 粒级)含量要比球磨机磨矿 高 2. 39 个百分点、立式辊磨机磨矿矿浆中的 Fe³⁺浓度也仅为球磨机磨矿矿浆的 17. 86%;通过闭路试验精矿指标对比 表明,使用立式辊磨机磨矿,可有效降低油酸钠与六偏磷酸钠用量,并降低精矿中 CaO 品位,提升精矿质量。     

高压辊磨+搅拌磨在某复杂难选铁矿石选别工艺中的优越性研究

为了验证在某复杂难选铁矿石的选矿工艺中,应用高压辊磨机和立式搅拌磨的优越性,进行了一系列对比试验。结果表明,与颚式破碎机相比,高压辊磨机产品的粉矿率更高,产品的可磨性更好;与球磨机相比,立式搅拌磨机细磨效率更高、效果更好,相同磨矿细度下,立式搅拌磨机磨矿产品的解离度更高,磁选铁精矿品位也更高;高压辊磨+立式搅拌磨在处理复杂难选铁矿石方面具有显著的优势。     

KLM型立式螺旋搅拌磨机的研究与应用

根据立磨机结构和工作原理,结合细磨作业立式螺旋搅拌磨机设计要求,选择KLM系列立磨机主要结构参数,通过对筒体、螺旋搅拌机构等关键部件的结构设计解决大型立磨机研制中的关键技术问题。介绍KLM系列立磨机在铁矿和铜钼矿选矿再磨中的应用情况。