矿车车轮拆装机在范各庄矿的应用

介绍了一种新型矿车轮对拆装的机械化设备。该机集拆装车轮、轴承于一体,结构紧凑合理、操作方便、效率高、维修质量好,较大地减轻了工人劳动强度,改善了作业环境,降低了维修及使用成本,延长了轮对使用寿命,能满足煤矿矿车轮对检修的要求,是理想的矿车轮对维修设备。     

混凝土裂缝的预防与处理

对混凝土工程中常见的一些裂缝问题进行了探讨分析。按裂缝产生的原因、裂缝所处状态、裂缝形状对混凝土裂缝进行了分类,对混凝土中常见的干缩裂缝、塑性收缩裂缝、沉陷裂缝、温度裂缝、化学反应引起的裂缝进行了详细的原因分析,针对具体情况提出了一些行之有效的预防措施,并对混凝土裂缝修补的一些主要方法进行了介绍。     

鸡笼山金矿天轮硐室施工技术

结合具体施工条件,对特大型硐室施工方案进行了分析,选择了适宜的施工方案。对地质条件较差、硐室太高、通风困难、提升不易、施工工序繁琐、施工机具较难展开等诸多困难条件下的硐室施工进行了探索,对硐室支护方式进行了革新,实现了安全、优质、快速施工。详细叙述了硐室施工方法。     

浅谈矿山压力及其控制

通过对采场矿山压力呈现规律的研究,总结了对采场矿山压力的6种影响因素:自然条件的影响、开采深度的影响、生产条件对采场矿山压力的影响、工作面推进速度的影响、支护材料及顶板管理方法对矿山压力的影响、采空区处理方式对采场压力产生的影响.掌握对采场矿山压力的影响因素,对控制顶板具有非常大的意义.介绍了对采场矿山压力假说的探讨,提出了对软顶板、厚煤层顶板管理的建议.     

硅藻孔径调控技术研究和应用

针对硅藻土中硅藻的孔结构特征对其应用有较大影响的问题,重点对近年来采用酸浸法、焙烧法、水热法等对硅藻土所含硅藻进行孔径调控的方法进行了综述;同时对硅藻土在助滤剂、载体、保温和建筑材料、填料等方面的应用现状和优点进行了描述,提出了一些存在的问题和不足,展望了硅藻土发展的前景。     

端盖式新型密封矿车轮对的研制及应用

介绍了煤矿窄轨车辆轮对的设计改进原理和方法,通过对轮对密封结构的改进,解决了矿车在井下使用时甩轮壳、易漏油等问题,设计了一种结构合理、性能可靠、使用方便的新型矿车轮对,达到了在使用期间可以免注油、检修周期比老式轮对延长4～6倍的目的.     

粘结永磁的现状及前景

综合了近期粘结永磁资料,对铁氧体、稀土合金粘结永磁特点、工艺做了介绍,并根据对粘结永磁的需求情况,对其发展前景做了预测,对直接与此种材料性能相关的工艺及原材料的改进提出了参考意见。     

稀散金属铼的分离富集与分析方法研究进展

综述了近年来分离富集铼的研究进展.对离子交换法、溶剂萃取法、萃淋树脂法、液膜法、活性炭吸附法等不同分离方法的特点进行了阐述,并对铼的分析方法作了较全面的介绍,同时指出了不同方法的特点和使用范围,最后对铼分析方法的发展方向作了展望.     

安太堡露天矿南排土场滑坡事故分析

为了对安太堡露天矿黄土排土场的滑坡进行治理,对1991年安太堡南排土场滑坡事故进行了调查研究。对地质条件进行了调查,包括气候、水文、地层、基底倾角等,对滑坡体特征进行了描述,用Phase软件对南排土场进行地质建模,分析了地下水位、裂隙贯通、排土场最高度、排土场基底倾角对稳定性系数的敏感性。分析得出地下水位上升是滑坡事故的最主要外因,排放强度过大不是主因,排土场的最危险裂隙位置位于排土场坡底线位置,为重塑黄土排土场的稳定性治理及滑坡预防提供重要的参考。     

韩梁矿区重组煤矿水害调查分析及防治

通过收集韩梁矿区重组煤矿的矿井地质资料、水文地质资料、采掘工程图、物探资料、其他相关主体矿井的地质资料和采掘工程图,对36个重组煤矿进行资料分析、整理,确定重组煤矿的空间位置、开采煤层以及生产情况、所处的水文地质单元。文章对重组煤矿的水文地质条件进行了分析,确定了其水害类型,分析了对主体生产矿井大庄矿、高庄矿的影响,并针对重组煤矿的水害提出了水害防治措施,对重组煤矿的积水量进行了计算,针对积水对主体生产矿井的影响提出了针对性防治措施。     

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