矿井地面机械化排矸方式的选择和体会

动筛跳汰工艺是目前矿井地面排矸的重要方式之一。文章分析比较了液压和机械两种动筛跳汰排矸方式的优缺点,并详细介绍了液压跳汰机的工作原理及构成,总结了动筛跳汰排矸工艺设计中的应用体会。     

杏花洗煤厂动筛跳汰车间煤泥水系统的改造

介绍杏花洗煤厂动筛跳汰工艺流程和动筛跳汰煤泥水流程,详细分析了该煤泥水系统存在问题。根据存在问题和生产实际情况,对该系统进行了改造,效果良好。     

机械动筛跳汰机新型动力提升机构的研究

分析了影响动筛跳汰分选效果的主要原因,从研究动筛曲柄连杆机构急回特性入手,对机械式动筛跳汰机动力提升机构及动筛机构关键部位进行了改进和完善,设计了新型动力提升装置,为进一步研究及指导大型动筛跳汰机的设计开发奠定了基础。     

离散单元法在矿物工程中的应用

离散单元法自提出至今20多年来在岩石力学等领域得到长足发展，成为解决离散的，非连续介质岩土工程问题的一种重要数值方法。通过对离散单元法的基本原理和数值方法进行系统研究，可以看出，矿物工程中的许多过程中都可以用离散单元法的观点和方法进行分析。作者曾首次用离散单元法对动筛跳汰过程进行模拟研究，并成功的实现了动筛跳汰过程的动态模拟，值得一提的是，近两届国际选矿会议均有国外学者介绍利用离散单元法模拟矿物加工过程的论文。为了使更多的人解离散单元法的原理和特点，拓宽离散单元元法的应用领域，在此，作者把离散单元法在矿物工程中的应用情况作一归纳。     

动筛跳汰机在新汶矿区的应用

介绍了新汶矿业集团动筛系统的改造方案，阐述了采用动筛跳汰需要注意的问题，并对该系统在集团3个选煤厂的具体应用效果进行了分析，认为采用比重介成本低的动筛跳汰机也可以达到提高排矸效率和块煤分选精度的目的。     

动筛跳汰机提升轮功率计算

对动筛跳汰机提升轮提料工作过程进行了分析，提出了物料提升轮中非对称分布的受力模型；首次考虑脱水效果β对功耗的影响；分析了脱水效果与产品水分的关系；确定了综合摩擦系数的值；导出了提升轮功率计算表达式及提升轮驱动电机造型计算表达式，并在动筛跳汰机上进行了验证     

动筛跳汰机在煤炭洗选中的应用与发展

简要阐述了目前主要应用的三种块煤排矸方法,详细介绍了动筛跳汰机的结构特点、分选原理与应用实践,提出了动筛跳汰工艺设计注意事项,并指出了未来动筛跳汰技术的发展趋势。     

动筛跳汰机煤泥水系统初探

通过探讨筛跳汰机选煤系统中煤泥水的动平衡浓度，分析了影响动平衡浓度的因素，给出了动筛跳汰机选煤的煤泥水极限浓度，提出了动筛跳汰选煤煤泥水可能直接循环使用的条件。最后通过实例进行验证。     

研究跳汰选理论模型的新观点——跳汰床层松散度

本文介绍按跳汰床层松散度确定影响跳汰过程各参数的初步理论。所开发的理论模型以液流在松散区通过跳汰床层的速度为依据。斯利斯等人曾研究过流化速度突变时流化床特点的预测理论。其公式则用于跳汰床特点的预测。为了检验这一理论模型是否适用于跳汰机,对现阶段的模型研究进行了计算机模拟。为了通过试验检验理论模型的模拟情况,专门制造了一台特殊的实验室跳汰机。试验用特殊液体与跳汰床层中固体颗粒的折射率相同。通过这种方法可获得某些数据。试验时跳汰机床层的固体颗粒取统一粒度和密度。试验过程的记录与资料整理借助一视频装置完成,然后将试验结果与模拟模型的结果加以比较。     

动筛跳汰——洗选块煤的新工艺

用现代技术改造的动筛跳汰机可有效地进行块煤排矸,既可代替大块煤的人工捡矸,又可用于中等粒级煤的洗选。由动筛跳汰法组成的选煤工艺。可使动力煤洗选过程大为简化,是改造筛选和发展动力煤加工的可取途径。     

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