充气水力旋流器处理能力数学模型

本文阐述以控制细磨加路中大密度有用矿物过磨改进型充气水力旋流器的自理能力进行了分析与研究，探讨结构参数与操作参数对其自理能力的影响，基于试验数据得出描述充气水力旋顺自理能力的模型。该模型为预测充气水力旋流器的自理能力提供依据，并为充气水力旋流器的造反计算及过程控制提供指导。     

水力旋流器分级工艺参数的确定及计算

本文推荐经生产实例验证、有应用价值的公式和曲线，总结出有关水力旋流器工艺参数计算的方法，可作为《选矿设计手册》一书有关旋流器计算内容的补充。     

氢氧化铝浆液水力旋流器节能技术改造

本文介绍了氢氧化铝浆液水力旋流器的工作原理,并针对某铝业公司氧化铝生产线晶种分解工序旋流器使用年限过长、结疤严重、分级效果不好、动力消耗大等生产实际情况进行节能技术改造.经过设计和选型计算,确定了水力旋流器的各种参数,选用1组处理能力为600 m3/h的氢氧化铝浆液水力旋流器替代原有的2台旋流器,合理优化布置新旋流器,...     

旋流器结构参数对白钨浮选给矿分级的影响

旋流器结构参数对分级作业有较大的影响。试验研究了不同规格和不同沉砂口与溢流口直径比例的旋流器的工作性能。对磨矿细度为-0.074 mm占84%、给料矿浆浓度为20.8%的白钨浮选给矿,采用直径为50 mm规格旋流器,沉砂口与溢流口直径比例ds/dOV为0.96、给矿压强为0.20 MPa时,获得分级作业指标矿砂部分产率83%、矿浆浓度42%;矿泥部分产率17%、矿浆浓度6%、平均粒度12μm。试验达到了对白钨浮选给矿泥砂分级作业的要求。     

某金矿选矿厂球磨机衬板及分级设备优化改造

针对某金矿球磨机衬板使用寿命不统一、分级设备分级效果差异大等问题,对球磨机衬板及分级设备进行优化改造。将球磨机端盖衬板由合金钢衬板改为橡胶衬板,并对衬板参数、结构进行优化,使衬板总质量减少约2/3,并缩小了衬板使用寿命差异。在磨矿系统的分级设备水力旋流器上加装压力表,使水力旋流器的浓度差异控制在3%以内,细度差异控制在5%以内。同时,对比了水力旋流器损坏部件修复与购买新部件的成本,据相关数据统计,每年可节约部件投入成本40余万元。     

Φ660旋流器结构参数优化实践

泗选厂Φ3.2×3.1m球磨机在将螺旋分级改为旋流器分级后,因国内无参考配置,初期未找到合适参数,致使分级效果差,影响浮选指标。本文着重介绍该厂对该旋流器结构参数进行的一系列优化配置实践,并最终找到了较佳配置,提高了分级效果。     

水力旋流器的入口压力及其控制

水力旋流器是选矿厂中脱泥分级的主要设备之一。在设备参数和其他工艺操作条件一定时,入口压力对旋流器的分级脱泥效率影响极大。入口压力的大小及其作用是旋流器研究中的主要问题,它能从大气中吸入空气,使旋流器中产生对分级具有重要作用的空气柱,空气柱的直径及形状随压力的大小而改变。在实际生产中,水力旋流器的入口压力多大为好呢?本文通过生产实践总结,提出一些看法,以资共同讨论。     

对选矿流程中搅拌旋流器的探讨

论述了传统水力旋流器的优缺点及工作参数,详细介绍了旋流器运行产生的空气柱效应,并提出通过改进搅拌旋流器设备结构和调整性能参数,能提高分级和工作效率,减少矿物过粉碎和流程返砂量,提高设备使用寿命,降低投资风险和维护费用,极大地节约运营成本。     

拜耳法种分过程旋流分级技术和设备的开发与应用

对氢氧化铝浆液进行分极,有利于拜耳法种分生产,采用旋流器作为氢氧化铝浆液的分级设备,从技术和应用上都是可行的。旋流器的结构参数、内衬材料的选择及其它相关的问题是旋流器能否成功在该领域应用的决定性因素。     

提高厂坝铅锌矿磨矿细度实践

通过对厂坝铅锌矿磨矿分级作业的考查分析 ,提出合理的旋流器结构参数 ,使用后提高了磨矿细度指标     

Rheological Effects in Grinding and Classification

Abstract

Experimental work has been conducted on industrial-scale wet comminution devices and hydrocyclone classifiers to investigate the effects of slurry rheology on their performance. Grinding performance is shown to be influenced not only by the absolute value of apparent viscosity and an inferred yield stress, but also by the rheological type of the discharge slurry. A new empirical model of the hydrocyclone incorporating slurry viscosity has been developed. Simulation has shown the effect of increased viscosity on cyclone performance to be generally deleterious.     

Scenario-Based Multi-Objective Genetic Algorithm Optimization of Closed Ball-Milling Circuit of Esfordi Phosphate Plant

The main goal of this article is to demonstrate an approach based on integration of process simulation and Multi-Objective Genetic Algorithm (MOGA) concepts to solve a real grinding circuit optimization problem by finding the best operating condition under which process objectives can be achieved. Esfordi phosphate plant is located near city of Bafgh at Yazd province of Iran and produces 5 Mt of phosphate annually. The fine particles (nearly ?20 µm) in hydrocyclone underflow which contain a high grade of iron are subjected to over grinding. In addition to electrical energy loss, this causes problems in the downstream process, i.e., flotation stage. The main goals of this study were to solve this problem by adjusting operating condition so that (a) hydrocyclone overflow particle size can be increased from 94.2 µm to 100 µm and (b) increase hydrocyclone underflow particle size from 205 to 500 µm. The second process objective will decrease fine particles in hydrocyclone underflow stream. First, plant sampling campaigns were carried out to calibrate ball mill and hydrocyclone models to be used for performing simulation trials. Then, full circuit simulations were done and optimized by MOGA search process to find the best operating condition that produces hydrocyclone overflow and underflow streams with predefined particle sizes simultaneously. The results indicate that there are various solutions that can be recommended for plant testing and performance improvements. The results of plant implementation of one solution for scenario No. 4 showed improved circuit performance and also validated simulator predictions.     

Effect of damaged liners and roping on classification performed by 6 inch hydrocyclone

Abstract

Mineral processing plants use hydrocyclones to classify coarse and fine particles. The hydrocyclone is a robust piece of equipment whose operation can be hampered by mechanical and operation problems. This paper assesses the effect of mechanical defects and roping on the partition curve of a 15 cm hydrocyclone. Two types of liner damages in the cylinder of the hydrocyclone were tested and not found to deteriorate significantly the classification of particles in the unit. Results obtained at the transition from spay to rope discharge show that a roping condition does not impact significantly the quality of the hydrocyclone classification.

Les usines de traitement de minerais utilisent des hydrocyclones pour classifier les particules selon leur poids. L’hydrocyclone est une pièce d’équipement robuste dont l’opération peut être entravée par des problèmes mécaniques et de fonctionnement. Cet article évalue l’effet des bris mécaniques et de décharge en boudin sur la courbe de efficacité d’un hydrocyclone de 15 cm. Deux types de dommages au revêtement du cylindre de l’hydrocyclone ont été évalués et les résultats ne montraient pas de détérioration significative de la classification des particules dans l’unité. Les résultats obtenus lors de la transition de décharge en parapluie à décharge en boudin montrent que la condition en boudin n’a pas d’impact important sur la qualité de la classification de l‘hydrocyclone.     

某铁矿尾矿分级浓缩及流变特性研究

为实现某铁矿尾矿的安全处置,采用旋流器对该尾矿进行了分级浓缩试验,系统考察了给料压力和沉砂口直径对尾矿分级效果的影响。同时,对高浓度尾矿进行了流变特性分析。结果表明,采用Φ100长锥型旋流器能够实现该尾矿的高效分级浓缩,适宜的给料压力和沉砂口直径分别0.25MPa和18mm,旋流器底流浓度和产率分别达到73.03%和62.18%。为保证良好的输送性能,尾矿浓度应控制在74%以下。     

水力旋流分离技术在瓦斯泥脱锌工程中的应用与研究

利用水力旋流技术对瓦斯泥进行湿法脱锌,是现有瓦斯泥脱锌技术中设备最简单、占地面积最小、运行费用最低的技术.简要介绍了宝钢利用水力旋流技术进行1BF瓦斯泥脱锌的科研及工程实施的情况,在保证脱锌率为70%时,回收率可达60%以上.着重从工程设计角度介绍实施瓦斯泥脱锌工程需解决的一系列关键问题,并对采用水力旋流分离技术实施高炉瓦斯泥脱锌工程的投入与产出进行了初步分析.     

旋流器串联分级在选矿流程中的应用

介绍了两种形式的旋流器串联分级分别在两个选矿工艺流程中的应用实例,考查了一次分级和串联分级的产品粒度,并利用水力旋流器分级特性曲线研究其分离效果,证明在不同的条件下采用不同形式的串联分级工艺,可以分别达到其独特的分级效果。对沉砂进行再分级的串联分级用于精矿过滤前的脱泥时,保证了分级沉砂较低的含泥量;对溢流进行再分级的串联分级用于浮选前的脱泥时,既降低含泥量又可以减少可选粒级的有用颗粒在分级溢流中的损失。采用串联分级对于选矿厂强化分级效果具有实践意义。     

某磷矿擦洗厂采用旋流器分选的技改实践

为解决某磷矿长期以来尾矿品位高、回收率和产率低的难题,对原设计的生产流程进行考察和取样分析,查找到流程存在的问题,为旋流器的结构参数和配置不合理,并进行了生产流程改造。将各段旋流器的结构参数进行优化后,使其分选效果大大提高,可将四段旋流器闭路流程改造为三段旋流器开路的分选流程,不但简化了生产流程,同时实现降低了尾矿品位,提高精矿回收率和产率的目标。     

Experimental Study of Dry Desliming Iron Ore Tailings by Air Classification

ABSTRACT

Techniques for dry processing low-grade iron ores and tailings are being investigated. Dry desliming tests using a rotating wheel air classifier and factorial design were performed on a difficult-to-treat low-grade high-goethite Australian iron ore tailings. The results were compared with theoretically ideal size separation and a hydrocyclone desliming study using the same tailings. The air classifier performance was poorer than the hydrocyclone due to agglomerated particles in the feed, including fines coating coarser particles. The “fish hook” effect was observed and discussed. After dry desliming, the silica and alumina contents of a selected product were 30% and 26% lower, respectively.     

某白钨矿重介质旋流器抛尾可行性试验研究

某白钨矿具有WO3品位低、嵌布粒度细的特点,分选过程中大量脉石矿物的存在导致入磨量大,能耗、药剂消耗高,且产生大量细粒级尾矿.采用重介质旋流器抛尾工艺进行试验研究,通过重介质旋流器抛尾工艺,最终实现抛废率为43.56％、WO3金属损失率5％的良好指标.试验结果表明重介质旋流器抛尾工艺具有可行性.