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。     

特大型球磨机球荷工作参数优化研究

文章简介了国内特大型球磨机的应用情况,同时在特大型球磨机开展球荷工作参数的优化研究。结果表明:特大型球磨机的充填率应维持在30%~31%;一段磨矿细度-0.074mm提高了4.62%;二段磨矿细度-0.074mm提高了3.19%,在精矿品位基本相同的情况下,镍回收率提高了1.02%,精矿氧化镁含量降低了0.5%。     

中关铁矿选矿厂磨矿工艺优化

为了提高选矿厂磨矿效率,降低球磨机吐出顽石量,中关铁矿针对一段自磨机磨矿、二段球磨磨矿工艺中矿石较硬、磨矿效率低、球磨机易吐顽石等问题,进行了物料进球磨机前预选和进球磨前破碎等工艺优化研究。通过在球磨前增加预选装置,将筛上物中的非磁性物料提前抛出,减少了进入球磨机的给矿量;在进入球磨机前的大倾角皮带下方增加对辊破碎机把-25 mm物料破碎成-6 mm物料,将硬度高的矿石进行了破碎。磨矿工艺优化后,提高了磨矿处理量,降低了球磨机吐顽石量,优化了磨矿效果,且经济效益显著。     

多元线性回归在磨矿回路中的应用研究

球磨机是粉碎过程中应用最为广泛的磨矿设备，通过建立数学模型，优化了球磨机结构、工作条件、物料性质和磨矿性能之间关系，提高粉碎和磨矿效率，研究了多元线性回归在球磨机中的应用。     

山西某铜矿磨矿分级自动化控制系统的运用与实践

结合中条山集团铜矿峪矿选矿厂磨矿分级系统的生产情况,引进了自动化控制系统。该系统投入使用后,实现了球磨机的优化给矿和比例给水,稳定了磨矿浓度和产品细度,最终球磨机台效提高了12.5%,处理能力由1.6539万t/d提高到1.8347万t/d,挖掘了生产潜力,提高了企业经济效益。     

提高永平铜矿一段球磨磨矿效率的研究

针对永平铜矿选矿厂一段球磨磨矿效率偏低的问题,采用优化磨矿球荷特性的方法进行提高磨机处理量、-0.074 mm利用系数和磨矿技术效率,降低磨矿球耗的试验研究。实验室结果表明,推荐介质制度Ф70:Ф60:Ф50:Ф30=30:20:25:25与现场介质制度Ф80:Ф70:Ф60:Ф50:Ф40:Φ30=30:20:20:19:8:3相比,过粗粒级γ+0.20mm低47.07%,磨矿细度γ-0.074 mm高3.96%;将新的磨矿介质配比运用于工业试验,优化后的1~#球磨机与未优化的2~#球磨机相比,磨机处理量提高1.1t/h,磨机-0.074 mm利用系数及磨矿技术效率分别提高5.29%和26.35%,钢球单耗降低6.51%,达到了提高一段球磨磨矿效率的效果。     

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。     

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。     

齐大山选矿厂一段磨矿改造实践

齐大山选矿厂两分选作业区均存在一段磨矿球磨机台时处理量低、溢流过磨严重的问题,影响铁精矿产量。为解决该问题,采取延长球磨机稳定高效运转周期、提高一段磨矿球磨机台时处理量和改变生产组织模式等措施进行技术改造。应用实践结果表明,改造后,球磨机稳定高效运转周期实现率提高到80%,一段磨矿球磨机台时处理量提高了30%以上,由原"球磨机"为主转车模式改为以"浮选区"为主转车模式,过磨现象也得到改善,达到改善磨矿效果、增产降耗的目的。     

某铜冶炼渣选矿厂SAB流程磨机衬板与钢球优化实践*

目前大多数铜冶炼渣选矿厂采用半自磨机—球磨机流程（SAB流程）进行粉磨作业,由于铜冶炼渣硬度大、性脆、易碎难磨,磨机衬板及磨矿介质消耗较大。针对某铜冶炼渣选矿厂开展了SAB流程衬板和钢球的优化研究。结果表明：①半自磨机用压条型铬钼钢衬板替代整体式锰钢衬板,使用寿命提高106.67%;球磨机用橡胶衬板替代锰钢衬板,使用寿命提高30%以上;检修强度大幅度降低,设备运转率明显提高。②半自磨机和球磨机由添加铸造钢球变更为锻造钢球,失圆率大幅降低;半自磨机补加球球径由120 mm调整为140 mm,增强了冲击破碎效果;球磨机补加钢球球径由60 mm调整为50 mm,磨矿浓度从75%提高到80%,研磨效果得到改善。③在磨矿细度保持不变的情况下,系统台时处理能力提高15.55%,钢球消耗降低26.32%,电力单耗降低26.67%,单位磨矿成本降低29.07%。企业经济效益和社会效益得到显著提高,对同行业具有一定的参考价值。     

Studies on grinding media wear and its effect on flotation of ferrugenous phosphate ore

Marked ball grinding tests were carried out in the laboratory with a low grade phosphate ore under different experimental conditions. Two types of balls were used, namely high carbon low alloy (HCLA) cast steel and high chrome cast iron. Results of marked ball grinding tests indicated that ball wear increased with time and showed a sharp increase for wet grinding over dry grinding. Ball wear under wet grinding conditions was also influenced by the gaseous atmosphere in the mill. The grinding ball materials could be arranged in the following order with respect to their overall wear resistance:High chrome cast iron > HCLA cast steel ballsMethods to minimize ball wear through control of mill atmosphere and addition of flotation reagents are discussed. Effect of grinding media and additions of flotation reagents during grinding on phosphate ore flotation are also discussed.     

磨矿分级自动控制在攀枝花密地选矿厂的应用

介绍了密地选矿厂应用磨矿分级自动控制的试验研究及生产运行情况。实践表明 :实施磨矿分级自动控制 ,提高球磨机台时处理量 7%以上 ,并降低了现场操作人员的劳动强度     

精确化装补球技术在黄金氰化细磨球磨机中的研究

Absrtact: Overflow ball mill is a common equipment in fine grinding of gold cyanide. There are problems of high energy consumption and ball consumption in fine grinding ball mill of Jinqiling gold mine cyanide plant in Shandong province. In order to solve this problem, the fine grinding ball mill is studied by precise ball filling technology. Firstly, the mechanical properties of the ore are tested by the rock mechanics experimental system, and the preliminary pellet scheme is calculated accurately by using the semi-theoretical formula of the diameter of the ball of Duan, and a precise supplementary pellet scheme is proposed on the basis of these. The results show that compared with the original steel ball system, the processing capacity of the mill is increased by 1,915 tons and 179 tons, and the grinding fineness is increased by 3.88% and 1.78%, respectively, by using steel ball and short cylindrical cast iron as grinding media. When cast iron is used as grinding medium, the grinding fineness index is better than that of steel ball, but the ball consumption is higher. Therefore, accurate ball filling technology can effectively reduce the energy consumption of overflow ball mill in large gold cyanide plant, and has a good promotion value.     

某铅锌矿立磨机与球磨机磨矿效果对比试验研究

立磨机和球磨机都是大型工业磨粉设备,被广泛应用于选矿、冶金、化工和煤炭等行业。本文针对某铅锌矿对比两种磨机的磨矿效果,采用立磨机与球磨机进行磨矿试验,并对试验产品进行筛分分析、单体解离度分析及浮选试验。试验结果表明:立磨机磨矿试验产品中粗粒级含量较球磨机试验产品下降了0.6百分点,方铅矿和闪锌矿单体解离度分别提高2.28和1.60百分点;立磨—浮选试验产品中铅精矿中铅品位及累计回收率较球磨机分别提高0.65和0.61,锌精矿中锌品位及累计回收率较之分别提高0.34和1.03百分点,硫精矿中铅和锌含量分别下降0.02、0.06百分点。综上所述针对该铅锌矿立磨机磨矿效果均优于球磨机。      

基于模糊PID控制的球磨机自动控制系统设计

提出了一种模糊控制对球磨机进行自动控制的技术方案,将模糊PID控制理论引入到球磨机控制系统中,能够很好地克服球磨机非线性、时变等因素的干扰影响,能有效地避免球磨机发生胀磨或是空磨现象。系统运行可靠,抗干扰能力强,能较好地实现球磨机恒功率自动控制,提高了设备的生产率和自动化水平,具有较好的推广应用价值。     

Effects of intensive grinding on the dissolution of celestite in acidic chloride medium

Effect of intensive grinding on the dissolution of celestite in acidic barium chloride and sodium chloride solutions was studied by investigating structural changes occurred during milling. Complete dissolution of the celestite was achieved within 25 min by milling in a planetary ball mill in which ball to ore ratio is 10. But, increasing grinding time and ball to ore ratio diminished the dissolution rate. X-ray amorphous phase content and XRD breadths increased and XRD line reflection intensity decreased with increasing of grinding time, and celestite does not undergo a considerable phase transformation during milling. SEM micrographs showed that how prolonged milling results in an increasing degree of agglomeration and a reduced amount of fines. Additionally, the ground samples were heated at elevated temperatures and then re-ground under earlier grinding conditions. Structural, morphological and dissolution characteristics of the samples obtained by each of the three treatments were also evaluated. It was concluded that high energy milling for short times increases the dissolution rate of celestite. But, increase in the particle size due to agglomeration or compactness of the particles as a result of impact stress predominant in planetary ball milling decreased the leaching rate, as grinding time and ball to ore ratio in the mill were increased.     

东鞍山混磁精矿搅拌磨与球磨对比试验

鞍钢东鞍山烧结厂原矿主要以细粒嵌布的赤铁矿和磁铁矿为主,为解决现场球磨机效率低、有用矿物单体解离度低等问题,进行了陶瓷球搅拌磨、球磨工艺的优化和对比试验.试验结果表明,搅拌磨适宜条件为充填率80％、料球比0.9、磨矿质量浓度60％、介质尺寸6 mm、搅拌器转速650 r/min;球磨适宜条件为介质质量配比为m(32 m...     

球磨-细筛回路循环负荷对某钨矿石磨矿产品粒度分布的影响

通过控制磨矿时间改变返砂量,研究了实验室球磨-细筛回路循环负荷对某钨矿石磨矿产品粒度分布的影响。结果表明,循环负荷由100%提高至500%,磨矿时间由5.12 min减少至1.57 min,磨机生产能力由49.21 g/min提高至53.06 g/min。粒度分析结果表明,磨矿回路产品中过粉碎级别-0.01 mm粒级含量由18.62%降低至14.24%,可选级别-0.106+0.01 mm粒级产率由81.38%提高至85.76%,且变化幅度均随循环负荷提高而变缓。提高循环负荷降低了磨机总给矿粒度,减少了矿石在磨机内的停留时间,减轻了过粉碎,有效提高了钨矿石的磨矿效率。     

四川某锂辉石矿磨矿产品粒级优化试验研究

针对四川某锂辉石矿,在浮选入料粒度为-0.075 mm粒级占70%的前提下,系统研究了磨矿浓度、磨矿时间、介质充填率、钢球配比、药剂作用及磨矿介质类型等参数对锂辉石最佳浮选粒级(-0.106+0.038 mm)分布及品位的影响。实验室试验结果表明,通过调整磨矿浓度、介质充填率和钢球配比等参数,可有效提高-0.106+0.038 mm粒级含量和磨矿技术效率。在此基础上,添加碳酸钠可改善磨矿过程中矿浆的流变性,碳酸钠用量为800 g/t时,能进一步提高-0.106+0.038 mm粒级产率。在-0.075 mm粒级占70%条件下,球磨和棒磨获得的-0.106+0.038 mm粒级含量相近,但球磨产品中该粒级Li₂O品位更高,选择性磨矿作用更好。优化球磨参数后,锂辉石回收率可达95.92%,精矿品位为4.84%。