KYZ-B型浮选柱系统的设计研究

从KYZ-B型浮选柱的工作原理出发,依据浮选柱浮选动力学的状态,详细分析了KYZ-B型浮选柱系统中主要组成部分——柱体、推泡器、给矿系统、气泡发生系统、液位控制系统、泡沫喷淋水系统等设计原理。依据以上理论设计了KYZ-B1065浮选柱,工业试验取得了较好指标。设计的KYZ-B0912和KYZ-B1212浮选柱在某选厂成功进行工业应用。     

用浮选柱反浮选铁矿的研究

用浮选柱进行铁矿“反浮选”,脉石（石英）经浮选进入泡沫产品中。本研究的目的是确定几种适于铁矿反浮选的浮选柱类型。分别采用Jameson浮选柱和 Deister浮选柱进行试验研究。一段Jameson浮选柱和一段维姆科浮选机的试验结果对比表明,Jameson浮选柱没有进一步试验的必要。Deister浮选柱实验室试验很成功,用该浮选柱组成的粗选－精选两段工艺获得了很好的试验指标。然而,实验室规模的浮选柱按比例放大到工业规模通常存在以下的问题,随着规模增大,浮选柱高度增大,浮选柱高度与直径比减小,使轴向混合和泡沫兼并加剧,这两大问题降低了浮选柱的性能。在浮选柱内安装水平稳流板的研究显示,稳流板可减小轴向混合,分散大泡沫,改善浮选柱的性能,因此,在铁精矿反浮选中,推荐使用带有水平稳流板的浮选柱。     

浮选柱按比例放大和模拟

在过去几年里,泡沫浮选技术方面的一项重要进展是柱浮选在工业上得到采用。目前加拿大的几家有色金属选矿厂正在采用浮选柱并认为将广泛应用于整个南北美洲。由于浮选柱与常规浮选机在工作原理上显著不同,且了解很少,所以浮选柱按比例放大是困难的。本文论述了实验室浮选柱数据转化为工业生产数据的方法。利用一系列实验室浮选柱实验所得到的动力学数据放大模型,实验室浮选柱可以做成短至2米高。为了模拟,认为浮选柱由两个区组成,即回收矿粒的捕收区和向下流动冲洗水产生的密集泡沫层的精选区。在Gaspe矿山利用工厂浮选柱示踪实验结果描述了捕收区混合状态,上述的这些实验也表明了机械夹带进入精选区的脉石矿物几乎全部排除。这个模型清楚地说明了捕收区和精选区的回收状况、考虑了气泡过载的影响。介绍在Gibraltar矿山的浮选柱放大实验结果。     

柱体高度对浮选柱性能的影响

本文提出了为什么浮选柱一般都有一个10米高(H),1米直径(D)的捕收区这个问题。认为有三个几何相关因素,它们是:混合程度,Np,容积偏流冲洗水流量,B;充气容积流量,G。增加 H:D,减少 Np 和 B,可以提高浮选柱的性能,而减小 G,则使浮选柱接近超载,采用通常的浮选柱操作条件,可以得出结论,捕收区 H:D 为10:1时较妥。     

KYZ-B浮选柱发泡器喷嘴流体动力学数值模拟

从设计角度出发.将计算流体力学(CFD)数值模拟软件CFX应用于KYZ-B型浮选柱发泡器喷嘴流体动力学的研究.对喷嘴内气体流动状态进行了数值模拟.通过分析计算结果中流体流动速度场特征,预测出喷嘴内气体超声速流动比低速流动更有利于提高发泡器的充气性能。     

浮选柱中水位深测装置的校准探测器

浮选柱中泡沫层厚度,或界面水位是影响精矿品位和回收率的重要控制参数。一般确定界面水位的方法是沿着浮选柱的高度测量一个或几个点的水静压力。用此法所确定的界面位置有相当大的误差,主要原因是泡沫区和捕收区的体积密度常有变化。一种基于测量界面电导率的轻便式电导探测器已经研究成功,用该仪器所观测到的电导信号变化较大的部位即是所要测定的界面位置。而信号变化的原因乃是由于在捕收区与泡沫区之间所容纳的气体量的差异。这种探测器测得的界面位置可精确到±5cm。当浮选柱运行时,该探测器可用来进行界面探测系统中各探测器的在线联动校准。本文叙述了该装置用于半工业性试验(浮选柱直径为0.91m)中所获得的结果。     

浮选柱生产参数的智能检测

对浮选柱选煤过程中利用ＭＰＸ系列Ｘ型横向压阻式硅压力传感器进行泡沫区及捕收区界面高度、密度等生产参数的测量问题进行了深入研究，得出了计算公式，并运用８０９８单片机实现了这些参数的动态测量，为今后的浮选柱自动控制创造了条件。     

浮选柱内紊流强度对气泡与颗粒碰撞概率的影响

文章首先介绍了KYZ-B型浮选柱的动力学分区,论述了矿物颗粒所需矿化环境与浮选柱紊流区的特点。借助计算流体力学及气泡紊流雷诺数和碰撞概率模型,分析三种不同尺寸颗粒与气泡的碰撞概率,表明100μm颗粒的碰撞概率整体分布都较74μm和37μm颗粒的大,37μm颗粒的碰撞概率整体最小。研究了4个充气速度100、140、180、220 m/s条件下,距充气入口200、400、600、800、1 000 mm的不同位置直线上气泡雷诺数和颗粒碰撞概率的分布。结果表明,相同充气速度条件下,充气紊流区内气泡紊流雷诺数、颗粒的碰撞概率明显大于其他区域;浮选柱给矿口区域由于矿浆流的冲击,增大了气泡运动能量;相同位置充气速度的增大会增加充气紊流区的气泡湍流雷诺数和颗粒与气泡碰撞的概率,为细粒矿物的矿化创造了条件。     

单槽容积60m~3大型圆筒形浮选机单相流场仿真研究

利用CFD软件,模拟了XJM-S型机械搅拌式60 m3圆筒形浮选槽初始虚拟样机的三维流动状态,分析了该样机的流场特征,发现:在各稳流板流道内矿浆流动不均衡,稳流效果不理想;在浮选槽入料口处,存在入料未经假底和叶轮而直接进入浮选槽,以及槽内部分矿浆回流到入料口的不合理现象。根据流场特征分析,提出了对该样机的入料口、稳流板等结构进行改进和优化的建议。     

用不添加冲洗水的浮选柱获得高品位萤石精矿

本文提出了用不添加清洗水的浮选柱浮选萤石的结果.调节尾矿浆流速比给矿浆流速小来获得精矿流.所以,一部分给矿水带人泡沫中.在这种浮选柱中,没有矿浆/泡沫界面.用搏收区高度为2 m的浮选柱获得了高的浮选回收率.浮选精矿回收率大于80%,品位为90%.试验结果表明,浮选回收率与给矿流的速度与尾矿流的速度差值有关.试验还发现,矿物流的横截面速度与其回收率之同具有直线关系.浮选柱的固体最大负载量约为10 g/(min·cm2).     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586