外加磁场对三产品重介旋流器二段分选密度的调控

针对三产品重介旋流器二段分选密度难以实现在线调控的问题,采用外加磁场的方式探究磁效应对重介旋流器二段分选密度的影响,试验结果表明:外加磁场可以调节三产品重介旋流器二段分选密度,且线圈位于筒体及锥体不同位置时,适用的电流范围及分选效果也有差别。     

三产品重介质旋流器与两段两产品重介质旋流器分选效果对比研究

为了比较三产品重介质旋流器和两段两产品重介质旋流器的分选效果,以公乌素选煤厂三产品重介质旋流器和两段两产品重介质旋流器为研究对象,完成了两种旋流器入选原煤、精煤、中煤、矸石的采样,并通过筛分、浮沉试验,系统地对比了入料中各粒级煤的分选效果,研究结果将对两种旋流器的分选效果和机理有一个量化、科学的理解和认识。     

无压三产品旋流器重介工艺在太原选煤厂的应用

介绍了无压三产品旋流器重介分选工艺、自动控制系统、三产品旋流器工作原理、影响分选效果的因素。三产品重介旋流器分选精度一段EP值可达到0．034，二段EP值可达到0．06，中煤带煤低于7%，矸石带煤低于0．5％，自动控制系统操作简单，工作性能可靠，与原有跳汰工艺相比，重介分选工艺数量效率提高4．24%。实践证明，通过引进重介洗选工艺，提高了对难选煤的适应能力和经济效益，提高了市场的竞争能力。     

三产品重介旋流器分选下限的测定

论述了西曲选煤厂全重介工艺改造后，通过对三产品重介旋流器分选下限的测定，比较不同的测定方法。利用精煤小筛分方法测定了三产品重介旋流器的分选下限，利用分配曲线方法较精确地测定了三产品重介旋流器的分选下限。为合理进行工艺设计及技术改造提供科学依据。     

三种不同重介选工艺中煤磁尾的试验研究

针对开滦煤质特性,以不脱泥三产品重介质旋流器分选工艺、脱泥两产品重介质旋流器分选工艺和脱泥三产品重介质旋流器分选工艺中煤磁选尾矿为研究对象,通过试验研究和方案优化,实施了粗煤泥精细化分选回收工艺,进一步提高了选煤厂经济效益和企业的竞争力。     

高变质煤分选的可行性研究

针对金佳矿选煤厂产品结构单一、分选效果不理想等问题,在分析原煤性质的基础上,对高变质煤分选的可行性进行研究。通过实验室单元煤泥浮选试验,确定了煤泥最优浮选参数组合,并通过调整三产品重介旋流器直径,增加浮选系统对选煤厂进行了技术改造。结果表明:改造后三产品重介旋流器分选效率为97.39%,中煤带精量小于8.00%,矸石带煤量小于0.60%;浮选入料质量浓度为99 g/L,精煤产率、精煤灰分、尾煤灰分分别为63.73%、9.92%和66.60%,精煤灰分明显降低,尾矿带煤较小,分选效果良好。因此,高变质煤分选精煤或生产其他高附加值产品在技术上可行。     

3GNZX300/230型双锥有压三产品重介质旋流器的研究

针对高矸易泥化高灰原煤的分选问题,对传统旋流器结构进行改进,设计开发了3GNZX300/230型双锥有压三产品重介质旋流器,并对该旋流器进行了流场数值模拟和实验室带煤试验研究,结果表明:对于高矸易泥化高灰原煤,该双锥旋流器的分选效果优于传统的3NZX300/230型有压三产品重介质旋流器。     

“十五”期间重介质旋流器选煤技术的研究与发展

对"十五"期间在重介质旋流器选煤技术方面进行的研发工作进行了综述。重点介绍了双供介无压给料三产品重介质旋流器的功耗、分选效果、两台供介泵的平衡及三产品重介质旋流器分级分选的选煤新工艺。指出该项目的研究成功,进一步提高了重介质旋流器选煤的效率和经济性,使我国重介质选煤技术达到了国际领先水平。     

新疆青河选煤厂重介分选应用分析

通过对新疆青河选煤厂煤质资料分析,确定采用三产品重介旋流器分选,利用三产品重介旋流器以低密度悬浮液实现高密度分选的技术特性,使工艺系统得以最优化,产品结构更为灵活。     

无压三产品重介旋流器分选煤系硫铁矿的研究

为了探索无压三产品重介旋流器分选高硫矸石中硫铁矿的可行性,首先研究了高密度重介悬浮液的特性,结果表明:悬浮液密度越高,稳定性越好;加重质粒度越细,悬浮液的稳定性越好,在高剪切速率下的粘度越低。将磨矿时间为20min的磁铁矿配制成密度为2.12².32 g/cm3的重介悬浮液,采用无压三产品重介旋流器对南桐干坝子选煤厂的高硫矸石进行分选试验,在重介悬浮液密度为2.2 g/cm3时,可得到品位为30.76%的硫精矿,表明无压三产品重介旋流器分选硫铁矿是可行的。     

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