磨矿分级自动控制生产实践

东风萤石公司浮选厂2号系列磨矿分级作业的自动控制系统采用定值给矿按比例给水以控制磨矿浓度,调节分级机的补加水以控制分级机溢流浓度和粒度的办法实现自动调节。实行自动控制后浮选作业稳定,指标提高,经济上有效益,两年零七个月的经济增益可以补偿自控装置的费用。     

矿浆浓度及粒度组成对某锌浸出渣分离粒度及磨矿参数的影响

某锌精矿冶炼厂拟采用闭路磨矿方案来改善砂磨机对一段浸出渣的磨矿效果。针对冶炼厂工艺要求尽量少补加水的实际,本文对采用闭路磨矿后矿浆浓度、粒度组成对分级机效果的影响及磨机参数的调整方案进行了探索研究。黏度测量结果表明,矿浆黏度随矿浆浓度的增加呈指数式增大,随-40μm粒级含量的增加而增大;分离粒度的计算结果表明,旋流器分离粒度受给矿浓度的影响更显著,分级浓度应控制在55%以内;通过模拟磨机给矿进行了磨矿参数的优化试验,结果表明,选择5 mm刚玉球作为磨矿介质,搅拌器线速度4.43 m/s可以取得较好的磨矿效果。     

矿浆浓度及粒度组成对某锌浸出渣分离粒度及磨矿影响

某锌精矿冶炼厂拟采用闭路磨矿方案来改善砂磨机对一段浸出渣的磨矿效果。针对冶炼厂工艺要求尽量少补加水的实际,本文对采用闭路磨矿后矿浆浓度、粒度组成对分级机效果的影响及磨机参数的调整方案进行了探索研究。黏度测量结果表明,矿浆黏度随矿浆浓度的增加呈指数式增大,随-40μm粒级含量的增加而增大;分离粒度的计算结果表明,旋流器分离粒度受给矿浓度的影响更显著,分级浓度应控制在55%以内;通过模拟磨机给矿进行了磨矿参数的优化试验,结果表明,选择5 mm刚玉球作为磨矿介质,搅拌器线速度4.43 m/s可以取得较好的磨矿效果。     

基于案例推理软测量的磨矿分级过程先进控制

针对磨矿分级过程中磨矿粒度难以在线检测和直接闭环控制的难题,采用案例推理技术建立了磨矿粒度的在线软测量模型,并在此基础上设计了对磨矿粒度进行闭环控制的先进推断控制系统。该先进控制系统能够根据磨矿分级作业的运行工况对底层PID控制器的设定值进行自动调节,然后通过PID控制回路对调整后的设定值进行跟踪,从而实现对磨矿粒度的闭环控制。在某选矿厂的工业应用表明,该先进控制系统能够对磨矿粒度进行较好的在线估计和控制。     

转速对高速斜盘分级机分级效率的影响

重点介绍高速斜盘分级机在中国黄金集团中原矿业有限公司进行的分级试验,并对高速斜盘分级机的分级原理进行阐述,试验过程中通过调节转速,考察了高速斜盘分级机各产品的产率及粒度变化,分析了转速对高速斜盘分级机内部离心力场以及分级效果的影响,测定不同转速下底流产品及溢流产品的品位变化。试验结果表明,转速对高速斜盘分级机分级效率有显著影响,提高转速,分级效率升高,但转速过高,分级效率会降低;高速斜盘分级机的分级粒径低至10μm以下,细粒级矿物10μm分级具有可行性;高速斜盘分级机在分级过程中兼具有脱泥的特点,可以实现连续作业,解决了当前泥质矿物影响浮选指标的技术难题。     

转速对高速斜盘分级机分级效率的影响

重点介绍高速斜盘分级机在中国黄金集团中原矿业有限公司进行的分级试验,并对高速斜盘分级机的分级原理进行阐述,试验过程中通过调节转速,考察了高速斜盘分级机各产品的产率及粒度变化,分析了转速对高速斜盘分级机内部离心力场以及分级效果的影响,测定不同转速下底流产品及溢流产品的品位变化。试验结果表明,转速对高速斜盘分级机分级效率有显著影响,提高转速,分级效率升高,但转速过高,分级效率会降低;高速斜盘分级机的分级粒径低至10μm以下,细粒级矿物10μm分级具有可行性;高速斜盘分级机在分级过程中兼具有脱泥的特点,可以实现连续作业,解决了当前泥质矿物影响浮选指标的技术难题。     

JKsimMet软件对某钨选矿厂磨矿-分级回路建模与粒度控制

描述了计算机软件JKsimMet 6.1中文版(简称JK 6.1)应用于某37 t/h钨矿选矿厂的磨矿回路优化研究。该软件可模拟和控制优化选矿厂的磨矿-分级回路,有效减少过粗和过细颗粒的产生,保证磨矿系统处理量的最大化。采用JK 6.1软件模拟的结果应用于生产中的结果表明,沉砂中WO3品位的累积减少了0.17%;在细度相近的情况下,溢流中-10μm粒级产率降低1.16%;沉砂中-10μm粒级产率降低0.63%;同时溢流产品的细度P80从78μm增大至82μm;钢球单耗降低7.69%;电能消耗减少4.77%。     

螺旋分级机的数学模型

作者通过实验证明了φ150mm 螺旋分级机作业存在着一条单一的折算分配率曲线(对于石英而言),文中建立了该曲线的方程。以该曲线为基础,利用逐步回归分析及逐步回归分析的BASIC程序,建立了螺旋分级机的数学模型。以该模型及Herbst 磨矿模型为基础,编写了磨矿回路计算机仿真的BASIC 程序,实现了稳态磨矿回路的计算机仿真。     

某金矿磨矿分级回路中重选流程结构研究与实践

塔吉克斯坦某金矿的矿石类型为低硫含砷石英长石型金矿石,属于少金属硫化物-金-石英矿石,金矿物嵌布粒度粗细不均,且以微细粒嵌布为主,主要集中于5～20 μm.根据确定的磨矿细度,设计了两段闭路磨矿流程,并在磨矿分级回路中配置了重选流程.对该矿磨矿分级回路中的重选流程结构进行了研究,确定了适合该矿的最佳结构形式,取得了良好...     

司家营铁矿磨矿分级系统优化改造实践

针对司家营铁矿选矿厂磨矿分级系统螺旋分级机与磨机台时产能不相匹配,分级效率低,影响流程指标稳定及台时产能进一步提高的问题,通过考察研究,实施了一段使用FX840平底旋流器替代原Φ3 m螺旋分级机,二段使用Φ500 mm平底旋流器替代原锥形旋流器的改造方案。优化后有效改善了磨矿分级产品粒度组成,提高了分级效率,一段分级效率提升15.81个百分点,分级溢流细度（-0.074 mm）提升了11.46个百分点,二段分级溢流细度（-0.074 mm）稳定到70%左右,取得了理想的应用效果。     

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