和睦山磨选系统旋流器参数优化

马钢集团姑山矿业公司为提高和睦山铁矿选厂磨矿生产能力,在主厂房磨选系统球磨机未改型的条件下,对磨选系统两段旋流器的结构参数进行优化,通过放大1段旋流器溢流管直径,使溢流细度-0.074 mm粒级含量降低至56%左右,对2段旋流器增开1台后,球磨机台时能力由原来的120 t/h提高至145 t/h,提高了分级效率,稳定了磨矿分级作业。     

某选矿车间一期磨矿—分级作业流程的改造

济南某矿业公司选矿车间一期磨矿—分级作业球磨机处理能力仅25 t/h,远低于二期的40 t/h,同时螺旋分级机返砂比高达1 217%,返砂率仅10%。为提高球磨机处理能力,改善分级效果,对一期磨矿—分级作业进行改造。通过增加分级效率高、返砂比低的水力旋流器和安装配套的上料泵及管道对一期球磨产品进行分级,确定合适的设备型号和安装方案后,一期球磨机处理能力提高到30 t/h,返砂比降低至220%,同时可实现水力旋流器和螺旋分级机单独、并联和串联使用的灵活切换,达到降低球磨机能耗、提高磨矿—分级作业指标的目的,有利于矿业公司能耗的降低和经济效益的提高。     

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。     

某选矿厂三选一段球磨机轧制钢球工业应用研究

某选铁厂原球磨机使用铸造钢球，存在钢球单耗高、一次磨矿分级溢流粒度粗、台时能力受限等问题，进行了轧制钢球替代铸造钢球的应用研究。结果表明，用轧制钢球替代铸造钢球，不仅使现场钢球碎裂、失圆和吐球现象明显改善，还使一段磨矿球耗由1.17 kg/t降至0.88 kg/t；一段磨矿球磨机台时处理量为124.74 t/h提高至127.56 t/h；一段磨矿分级溢流-200目含量由52.32%提高至54.65%；磨矿电力单耗由9.77 kWh/t下降至9.10 kWh/t；一段球磨机台时处理量提升幅度有限与全系统能力有限有关；使用轧制钢球后三选作业区年直接经济效益达336.08万元，效果显著。     

提高安徽某磁铁矿生产能力的研究与实践

安徽某磁铁矿采用两段磨矿-三段弱磁选-浓缩磁选的选矿工艺流程，投产初期，磨机能耗、钢耗偏高，二段磨矿过磨、金属流失较为严重，对磁铁矿选矿工艺进行综合尾矿再选，每年为选厂增产1.78万t铁品位为65%的铁精矿；一段分级优化、粗粒级分选，降低了溢流跑粗和沉砂夹细程度，磨机台时处理量可由350 t/h提高至380 t/h，分级效率提高近20个百分点，返砂比降低约200%；淘洗机在二段磁选流程中使用后，一段磨矿系统处理量可由平均380 t/h提升至430 t/h，系统处理能力显著提高，实现提高磨矿处理能力、节能降耗的目的。     

某铁矿高压辊磨——预选精矿的球磨与塔磨效果对比研究

为提高矿山磨矿效率、实现节能降耗,以某铁矿高压辊磨—预选精矿为研究对象,分别采用球磨机和塔磨机为粗磨设备开展磨矿试验。结果表明:(1)采用球磨机磨矿,磨矿时间为200 s时,新生成-0.074 mm产品的能耗为150.08 k W·h/t,磨机-0.074 mm利用系数为0.586 t/(m³·h);采用塔磨机磨矿,磨矿时间为600 s时,新生成-0.074 mm产品的能耗为138.53 k W·h/t,磨机-0.074 mm利用系数为0.195 t/(m³·h)。2种磨矿方式的产品各粒级产率差异主要集中在+0.150 mm和0.150～0.074 mm。(2)优化试验确定适宜的塔磨工艺参数为:磨矿时间300 s、磨矿浓度60%、搅拌器转速300 r/min、介质充填率16.15%、料球比0.166 4。该条件下,磨机-0.074 mm利用系数为0.625 t/(m³·h),新生成-0.074 mm产品的能耗为53.62 k W·h/t。与球磨机相比,-0.074 mm利用系数提高6.66%,新生成-0.074 mm产品...     

选矿厂提质增产工艺技术研究与应用

某金矿通过破碎腔型优化及智能给矿,使破碎小时处理量增加约33t/h,碎矿最终产品粒度-12mm含量由80%提高到约83%;通过降低入磨粒度,优化磨矿分级流程实现精确化磨矿,旋流器溢流细度-0.074mm含量由51%提高到53%,选矿日处理能力由原来的10 000t/d提高到10 500t/d。同时,通过对旋流器结构优化提高分级效率,消除旋流器溢流中粗粒,优化磨矿产品粒度组成,使磨矿产品尽量集中易浮区间内,为后续选别提供更好的条件。     

圆筒筛磨损原因分析及改造

<正>北方铜业铜矿峪选矿厂设计生产能力600万t/a,原矿硬度系数f=13~14,采用一段闭路磨矿分级系统,配置3台MQY 5.03×8.5溢流型球磨机、6台渣浆泵、3台7-Ф660水力旋流器。球磨机排矿通过6台渣浆泵(其中3台整体备用)扬送矿浆至3台水力旋流器组进行分级,旋流器溢流(细度为-0.074 mm占68%)自流至3台Ф4.5 m×4.5 m的搅拌槽中进行浮选前调浆,旋流器底流返回至球磨机再次磨矿。     

搅拌磨在关宝山铁矿二段磨矿中的应用试验

鞍钢关宝山铁矿石属矿物嵌布关系复杂、嵌布粒度粗细不均的铁矿石,现场采用球磨机进行二段磨矿,磨矿效率低、效果差、能耗高。为了解搅拌磨机替代现场二段球磨机的可能性,以现场-0.043 mm占23.13%的二段球磨机给矿为试验样,以SLJM-2L型立式超细搅拌磨机为磨矿设备进行了磨矿工艺参数研究,并在可比条件下进行了球磨机与搅拌磨机磨矿效果对比。结果表明:(1)SLJM-2L型立式超细搅拌磨机处理试验样的适宜钢球直径为8mm,充填率为70%,料球比为0.7,搅拌器转速为400 r/min,磨矿浓度为70%。(2)在磨矿产品细度均为-0.043 mm占85%的情况下,球磨机的比生产率为0.48 kg/(Lh)、磨矿效率为9.68 kg/(kWh)、比功耗为64.66(kWh)/t,搅拌磨机的比生产率为4.70 kg/(Lh)、磨矿效率为36.16 kg/(kWh)、比功耗为18.21(kWh)/t,两相比较,搅拌磨吨矿石磨矿能耗仅为球磨机的28.16%。因此,在矿石的细磨方面,搅拌磨节能优势明显。     

基于矿石碎磨特性的设备选型及能耗分析

针对国外某铜金矿进行了标准落重试验、SMC试验和邦德球磨功指数测定,基于碎磨特性测定结果,在JKSimMet软件平台上构建SABC流程模拟,确定了半自磨机和球磨机的型号.同时Morrell模型的粉碎比能耗估算结果表明,SABC方案所需的粉碎比能耗为20.62 kW·h/t,虽然比其他常规碎磨流程的粉碎比能耗略高,但因其...     

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%.     

江西某钨矿选矿厂精确化磨矿研究

针对某钨矿密度大、易脆,在磨矿分级回路中易过粉碎而导致分级溢流中-0.010 mm粒级含量增加的问题,测定了该矿石的力学性质,通过球径半理论公式计算出了有效的磨矿钢球尺寸及其配比,并进行了工业验证试验。结果表明,磨矿介质优化后,磨机处理量提高了1.99 t/h,磨机排矿中过粉碎粒级-0.010 mm含量降低了1.09个百分点,易选粒级-0.15+0.010 mm金属分布率增加了15.36个百分点;螺旋分级机溢流-0.074 mm粒级含量增加了2.09个百分点,-0.010 mm粒级含量减少了4.74个百分点、金属分布率减少了10.96个百分点,易选粒级-0.15+0.010 mm含量增加了7.95个百分点、金属分布率增加了12.18个百分点;磨矿介质优化后,钢球消耗降低了0.17 kg/t,电耗降低了1.74 kWh/t,节能降耗效果显著。     

云南某铜矿SABC碎磨流程能耗分布规律及能量基准评价研究

提高碎磨流程能量利用效率是降低碳排放的重要途径,而碎磨能耗分布规律研究与能量基准评价是提高能量利用效率的前提和基础。某大型铜矿SABC碎磨流程能耗分布规律研究结果表明,碎磨全流程比能耗为19.59kWh/t,半自磨机、球磨机、顽石破碎机的比能耗分别占全流程比能耗的36.76%、55.75%及0.83%;球磨机运行功率接近安装功率的93.40%,是限制碎磨系统产能进一步提升的瓶颈。以原矿代表性样品单颗粒冲击破碎试验为基础,建立了矿石粉碎模型,通过能量基准评价方法计算出SABC碎磨全流程理论最低粉碎能耗为8.96 kWh/t,分别对SABC碎磨全流程、半自磨+振动筛+顽石破碎作业、球磨与分级作业进行了能量基准评价,得出能量效率因子（BEF值）分别为2.19、1.71和2.60,进一步明确了提升球磨分级作业能量利用效率的必要性。能量基准评价研究为碎磨流程能量利用效率提供了统一、定量的评价指标,为碎磨全流程产能提升与节能降耗指明了优化方向。     

High pressure grinding rolls (HPGR) applications in the cement industry

In this study, the performance evaluation studies in five cement grinding circuits, in which HPGR is used in various configurations, were presented. Sampling surveys were performed around the circuits followed by the determination of the size distribution of the samples down to 1.8 μm using a combination of sieving and laser sizing methods. The results showed that the specific energy consumption of the circuit decreases as the size reduction achieved by the HPGR increases. As given in the case studies when the size reduction ratio (F₈₀/P₈₀) changed from 308.2 to 4.4, the specific energy consumption of the HPGR was 8.02 and 4.05 kWh/ton, respectively. Since various configurations offer rather different ball mill feeds, the best usage of HPGR could be attained by optimization of operating parameters of both ball mills and air classifiers.     

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。     

Optimisation of the grinding circuit at arafertil,Brazil

Arafertil's regrinding circuit is responsible for the recovery of apatite with a low degree of liberation, representing approximately 11% of the overall apatite concentrate production. Low grinding capacity prevented an ideal size distribution of product for maximum recovery in the subsequent flotation stage, as shown in a liberation study.This work was aimed at attaining the required increase in regrinding capacity, using process simulation by computer mathematical modelling, with the objective of implementing an optimised grinding and classification circuit.The ball mill and hydrocyclones models were calibrated, and their equations were defined, from industrial data acquired in the old concentrator configuration and results from laboratory grinding tests with power consumption measurements.The model was validated by means of comparison between the results predicted by simulation and those achieved in the plant after refurbishment. The apatite flotation recovery increased from 31.5% to 48.0%, in agreement with the previous apatite liberation study.     

立式搅拌磨机磨矿机理研究进展

立式搅拌磨机是一种高效率、低能耗的细磨和超细磨磨矿设备,相对于卧式球磨机,立式搅拌磨机在节省能量消耗方面具有显著的优越性,被广泛应用于矿山领域的精矿再磨和第二、第三段磨矿作业。为了促进立式搅拌磨机的优化与开发,本文介绍了立式搅拌磨机的运行工作原理,系统总结了立式搅拌磨机研磨理论和磨矿介质运动状态研究成果,综述了搅拌器转速、介质填充率、磨矿介质属性、搅拌器属性等工作参数与结构参数对立式搅拌磨机磨矿过程和研磨效果的影响,分析了立式搅拌磨机关键技术参数的选择条件,为立式搅拌磨机的机理研究与发展提供参考。     

梅山铁矿精确化磨矿工业试验研究

为了提高磨矿均匀性和降低磨矿过程成本, 梅山铁矿选矿厂在四系列进行了精确化磨矿工业试验。结果表明, 与应用前相比, 二段分级溢流产品中平均粒度加粗10%;合格粒级含量提高1.82个百分点, 提高幅度为2.35%;-10 μm粒级含量降低了1.05个百分点, 降低幅度为6.91%。磁选尾矿中-10 μm粒级含量下降15.56个百分点, 降低幅度25.52%;平均粒度加粗0.06 mm, 加粗幅度150%。同时磨机功耗下降1.68 kWh/t, 钢球单耗下降0.1 kg/t, 磨机噪音下降2~6 dB, 磨矿矿浆温度降低0.5~2 ℃, 一段磨磨机衬板使用寿命估计可延长6个月, 二段磨磨机衬板使用寿命可延长1年以上, 折合降低磨矿成本1.70元/t, 取得了非常显著的节能降耗效果。四系列研究成果已经在其他系列同类型磨矿作业中推广应用。     

工业磨机中的解离特征研究

采用图象自动分析装置研究了复合硫化矿石和磁铁矿石在工业磨机中的解离特征、结果表明，对于特定的矿石而言，细至浮选粒度的全自磨磨矿比一段自磨和二段球磨组成的磨矿系统产生了更适宜于浮选的粒子形状和解离特征，总体上达到了节能效果。