KWM卧式搅拌磨机的研制及应用

基于卧式搅拌磨机的工作原理,分析研究了其关键技术,包括筒体磨腔形态、搅拌器形式、密封装置和分级装置等,进而成功开发了KWM卧式搅拌磨机。该设备具有能量密度高、粉磨强度大、产品粒度细和开路磨矿等特点,可用于金属矿和非金属矿的细磨及超细磨作业。最后总结了KWM275卧式搅拌磨机在工业化连续运转过程中的研究成果。     

卧式搅拌磨机在选铁工艺的探性工业试验

汝阳东沟矿床中磁铁矿的粒度嵌布比较细,在选铁再磨工艺段,使用国产WJM卧式搅拌磨机进行了工业探索试验.试验结果表明:在相同给矿条件下,WJM卧式搅拌磨机的装机功率较现场磨机降低了14.8个百分点,磨矿产品细度(-23 μm)较传统球磨机增加了8.65个百分点;铁精矿指标提高了3～5个百分点,回收率较传统卧式磨机提高了8.24个百分点.在一定范围内,适当提高磨机的转速和充填率可提高磨矿产品的细度.     

立磨机磨矿机理研究

本文分析了立磨机内磨矿介质的运动状态,分别讨论了磨矿介质在两个磨矿区域产生的不同磨剥作用,分析结果表明增大螺旋叶片直径和转速,减小螺旋升角有助于提高立磨机磨矿效率,但是为了能使立磨机磨矿效率最大化的同时降低磨矿能耗,必须综合考虑各种磨矿因素才能确定合理的结构参数和运行参数。     

搅拌磨在难处理金属矿细磨中的应用

微细嵌布难选矿石在我国分布广,涉及铁、铜、钼、铅锌、黄金等金属矿种,搅拌磨技术是实现微细嵌布难选矿石细磨的关键技术。介绍搅拌磨在难处理钼矿、铁矿、金矿中的典型应用实例。这些实例表明,搅拌磨可在提高目标矿物单体解离度的同时,使细磨产品具有窄的粒度分布,减少目标矿物泥化,从而实现精矿品位和回收率的共同提高,并且可显著提高能量利用效率。     

高效超细搅拌磨的设计和应用

介绍了新型搅拌磨设备结构、工艺及其在工业矿物中的应用情况。     

Analysis of stirred mill performance using DEM simulation: Part 1– Media motion, energy consumption and collisional environment

Stirred mills are becoming increasingly used for fine and ultra-fine grinding. This technology is still poorly understood when used in the mineral processing context. This makes process optimisation of such devices problematic. 3D DEM simulations of the flow of grinding media in pilot scale tower mills and pin mills are carried out in order to investigate the relative performance of these stirred mills. Media flow patterns and energy absorption rates and distributions are analysed here. In the second part of this paper, coherent flow structures, equipment wear and mixing and transport efficiency are analysed.     

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。     

Analysis of stirred mill performance using DEM simulation: Part 2 – Coherent flow structures, liner stress and wear, mixing and transport

Stirred Mills are becoming increasingly used for fine and ultra-fine grinding. This technology is still poorly understood when used in the mineral processing context. This makes process optimisation of such devices problematic. 3D DEM simulations of the flow of grinding media in pilot scale tower mills and pin mills are carried out in order to investigate the relative performance of these stirred mills. In the first part of this paper, media flow patterns and energy absorption rates and distributions were analysed to provide a good understanding of the media flow and the collisional environment in these mills. In this second part we analyse steady state coherent flow structures, liner stress and wear by impact and abrasion. We also examine mixing and transport efficiency. Together these provide a comprehensive understanding of all the key processes operating in these mills and a clear understanding of the relative performance issues.     

塔磨机技术综述

塔磨机是一种新型湿式细磨和超细磨设备,该设备在选矿厂碎磨车间和烟气脱硫石灰石浆液制备等领域逐渐得以应用.本文主要介绍了国内外塔磨机的发展状况、粉磨机理、主要结构及各部件之间的装配关系,以及塔磨机常用的工艺位置、给料和排料颗粒粒度和工艺流程.     

鞍千预选精矿陶瓷球搅拌磨再选试验研究

鞍千选矿厂现有流程磨矿产品存在粗细分布不均匀、再磨效率低、能耗高、磨矿效果差等问题,影响后续分选过程,导致精矿指标差。针对以上问题,为改善预选精矿磨矿效果,提升最终精矿指标,有必要采用更适于细磨的立式搅拌磨机,对搅拌磨机各项参数进行系统的研究。本文在鞍千预选精矿工艺矿物学分析的基础上,进行了搅拌磨磨矿—弱磁分选工艺流程试验。试验结果表明：预选精矿TFe品位为39.62%,主要以磁铁矿形式存在,粗细粒级分布不均。通过对陶瓷球搅拌磨工艺参数的优化试验研究,确定了搅拌磨最佳工艺参数：介质充填率为100%,搅拌器转速1000 r/min,料球比0.7,介质尺寸6 mm,磨矿浓度50%,磨矿时间2.80 min,磨矿产品经过一段弱磁选,可以获得品位67.01%,回收率89.93%的精矿指标。该工艺流程简单,指标良好,可为选矿厂工艺流程改造提供参考。     

Effect of High Pressure Grinding Rolls (HPGR) pre-grinding and ball mill intermediate diaphragm grate design on grinding capacity of an industrial scale two-compartment cement ball mill classification circuit

Effect of High Pressure Grinding Rolls (HPGR) pre-grinding and two-compartment ball mill intermediate diaphragm grate design on grinding capacity of an industrial scale conventional two-compartment ball mill cement grinding and classification circuit was investigated. For this purpose, cement clinker was crushed in an industrial scale HPGR in open circuit and fed to a Polysius® two-compartment ball mill and air classifier closed circuit. Two-compartment ball mill intermediate diaphragm middle grate design was changed when HPGR crushed clinker was fed to the circuit to obtain optimum flow of material from the first compartment into the second compartment. Modifications on the diaphragm design were required due to the increased throughput when processing HPGR product. Two sampling campaigns were performed at the steady state conditions of the circuit. Raw clinker (uncrushed clinker) was fed to the conventional two-compartment ball mill air classifier circuit in sampling campaign-1 whereas HPGR crushed clinker was fed to the same circuit with modifications on the intermediate diaphragm middle grate design in sampling campaign-2. Mass balanced tonnage and particle size distributions were estimated by using JKSimMet Steady State Mineral Processing Simulator in both sampling campaigns. Polysius® two-compartment ball mill was modeled by using perfect mixing modeling approach (Whiten, 1974). Specific discharge and breakage rates in the grinding compartments were estimated by using the two-compartment ball mill model structure proposed by Genç and Benzer (2015). Specific discharge rates were found to increase at coarse size ranges when raw clinker was fed to the circuit in compartment-1. However, specific discharge rates of particles were increased slightly at coarse size ranges in the second compartment at higher mill capacity condition. Specific breakage rates were increased when the circuit was fed with HPGR crushed clinker. Modifications in the circuit and the ball mill intermediate diaphragm grate design enabled the optimization of the grinding capacity of the conventional two-compartment ball mill cement grinding and classification circuit. Ball mill grinding and classification circuit capacity was increased by 10% and specific energy consumption of the ball mill was decreased by 9.1%.     

新型卧式超细搅拌磨机的结构原理研究与中试应用

介绍一种新型超细搅拌磨机,阐明该磨机的结构特点、工作原理、性能特点及磨介的选取,并对结构进行分析,分别论述磨机各组成部分的技术特点及应用,最后分析此搅拌磨机的机械参数和非机械参数对研磨效果的影响。     

VTM立磨机在庙沟铁矿细磨工艺中的应用研究

针对庙沟铁矿有用矿物嵌布粒度为0.04~0.07mm,现有细磨工艺很难达到90%的单体解离,而且处理能力不足的问题,对庙沟铁矿粗精矿进行了细磨工艺试验研究。最终确定前两段磨矿工艺不变,用一台VTM1500立磨机代替原有的两台MQY2736球磨机作为第三段磨矿工艺,结果提高磨矿产品细度44.49%,单体解离从87.6%提高到96.7%。该矿使用立磨机的同时对工艺流程进行了相应优化,解决了原流程循环量大的问题,磨机台时能力提高到8.3t/h。工业应用表明最终铁精矿品位由原来的65.2%提高到66%以上,年增经济效益3024.05万元。     

铁矿石球磨机衬板干湿磨摩擦磨损机理研究

为掌握铁矿石球磨机筒体内衬板摩擦磨损机理,设计了铁矿石球磨机衬板—磨球摩擦磨损试验台,在此试验台上进行衬板与磨球间的摩擦磨损试验,以ZGMn13衬板试样为研究对象,探究干湿磨时不同磨损工况下衬板与磨球摩擦系数、摩擦接触温升及磨损率变化规律,结果表明:压力对摩擦系数、温升和磨损率的影响大于转速;磨球与衬板间的摩擦系数随载荷W增大而减小,有矿粉颗粒干磨摩擦系数达0.59,矿浆湿磨时仅为0.25;无矿粉干磨情况下温升较小,最高温升仅4.3℃,温升速率随磨程S的增长呈现先快后慢的趋势;磨损率随载荷W的增大而急剧增大,矿粉的加入会使表面犁沟变宽且分布无序,矿浆的加入阻隔了磨损,使表面纹理不明显。     

DEM validation of media shape effects on the load behaviour and power in a dry pilot mill

Simulations were carried out in Metso’s DEM simulator so as to draw up an understanding of the effects the various ways of defining media shapes within the simulator have on the load behaviour and mill power draw. Wits University made available the load behaviour and mill power draw experimental results for the spherical balls, worn balls and cylpebs so as to validate the DEM simulations. The spherical media were defined by a regular spherical shape model and a multi-faceted polyhedron model. Worn balls were defined by super quadric models. A comparison was made between spherical media shapes, non-spherical single media shapes and a distribution of non-spherical media shapes and sizes in representing a load comprised of worn balls. The effect of increasing angularity of non-spherical media shapes on mill power was investigated. The cylpebs were modelled using a regular cylindrical shape model and the effects of friction on the power drawn were determined.     

立式螺旋搅拌磨矿机在工业中的应用

介绍了立式螺旋搅拌磨矿机的结构，工作原理和主要特点，并着重叙述了该机在金属矿和非金属矿细磨或超细磨的应用情况。     

矿渣立磨系统配置设计研究

矿渣立磨粉磨工艺系统,以其技术先进、生产可靠、系统节能和经济环保等诸多优点,而被国内外工业生产广泛采用。结合中信重工机械股份有限公司设计并已成功运行的矿渣立磨工艺系统的设计配置进行研究。通过对该系统的物流平衡、气流平衡及热量平衡进行计算,得出该系统中关键设备,如热风炉、袋收尘器及排风机等的选型依据参数。     

介质的尺寸和配比对球磨机磨矿粒度影响的研究

针对目前选矿厂球磨机磨矿介质(钢球)尺寸、配比不合理,严重影响磨矿粒度。采用球磨实验机和离散元软件EDEM相结合的方法针对MQG 3 600 mm×4 500 mm型球磨机磨矿介质尺寸、配比对磨矿粒度的影响情况进行研究。研究结果表明,某选矿厂该球磨机磨矿介质尺寸偏大,现场磨矿介质配比不合理。优化后钢球尺寸最大为Φ80 mm,采用本文推荐的磨矿介质配比,Φ80、Φ70、Φ60、Φ40、Φ30 mm钢球分别占25%、25%、20%、20%和10%,此时磨矿粒度最优。     

湿式搅拌磨细磨重质碳酸钙的实践和微粉加工工艺

介绍了ＧＳＤＭ－４００型超细盘式搅拌磨细磨不同产地重质碳酸钙的工艺实践，阐述了造纸涂布级重钙微粉的超细加工工艺，分析了各种工艺的特点和选择依据。     

立式螺旋搅拌磨机磨矿机理研究——矿浆浓度及磨矿时间的影响

实验室条件下,以石英砂为磨矿对象,探索研究磨矿时间及矿浆浓度对产品细度的影响。试验研究表明磨矿时间越长,产品粒度越细,但增加率越来越小;磨矿时间相同时,40%~60%磨矿浓度范围内矿浆浓度越低,产品细度越细。