鹿洼煤矿四采区压煤村庄搬迁可行性研究

根据鹿洼煤矿压煤开采地质条件、村庄压煤范围、地表移动变形规律,在对井下煤层开采地表塌陷量及影响范围预测计算的基础上,通过对村庄搬迁的经济技术可行性分析、论证,选择村庄整体搬迁的方案是合理可行的。     

综放开采村庄房屋破坏规律与保护技术

为了解决综采放顶煤条件下地表移动剧烈,地表的移动变形值和动态变形值大的问题,在五阳煤矿7511工作面上方建立地表移动观测站,进行地表移动观测,选择了4处试验观测区进行房屋采动破坏观测,系统研究了综采放顶煤条件下村庄房屋破坏规律、村庄建筑物保护技术。结果表明:新建村庄经历了老采空区的残余沉陷变形影响和7511、7512综放工作面开采的采动波及影响,所有房屋没有出现裂缝。利用采空区上方塌陷区附近就近建设抗变形村庄,是合理解决综放开采条件下村庄下采煤的有效途径之一。     

地表移动观测站建立的合理性研究

研究合理建立地表移动观测站，对于掌握地表与岩层移动的基本规律，科学指导压煤村庄搬迁及留设保护煤柱工作有较强指导意义。本文对地表移动观测站建立的时间，布设形式以及未来建站发展趋势等问题进行了探讨，提出了建立地表综合观测站的新思路。综合观测站的建站形式即可测得特征点附近测点的移动变形值，为研完地表移动规律提供重要依据，又对重要建筑物进行了变形观测，希望对以后建立地表观测站的形式有一定的参考作用。     

翟镇煤矿首采面开采地表移动变形规律分析

通过对翟镇煤矿七采区7201首采面开采后地表观测站观测资料进行分析，得出了7201面开采后地表移动变形规律，求出了部分地表移动变形参数，并总结分析出了断层对地表的影响规律，丰富了翟镇煤矿岩移观测成果，安全开采出村庄下压煤70万t，具有显著的社会和经济效益，对其它采区的开采和相似地质条件的矿井开采具有指导和借鉴作用。     

新义矿大采深地表移动规律研究

为了研究大采深条件下地表移动规律,新义煤矿在首采面11011工作面上方建立了地表移动观测站,通过对观测数据的整理分析,获得了该矿大采深地质采矿条件下地表移动、变形规律和概率积分法预计参数,为村庄留设保护煤柱以及村庄下压煤安全合理的设计提供理论基础和技术资料。     

凌志达矿双层煤重复开采条件下地表移动变形规律研究

为研究凌志达矿下层煤(15#煤)开采对地表移动变形的影响,基于地表观测站的实测数据,分析得出了15#煤层开采的地表移动变形规律及地表移动变形特征参数。通过MSDFVS与FLAC3D对地表移动变形进行预测和模拟,进一步验证了结论的可靠性;通过与上层煤(3#煤)开采时地表实测资料的分析对比,确定了15#煤与3#煤开采地表移动变形特征的差异。     

星村煤矿大采深极不充分采动条件下开采沉陷规律研究

星村煤矿约80%煤炭资源被村庄压覆,村庄压煤的合理开采是矿方面临的一项重大课题。为切实掌握本矿的开采沉陷规律,在东翼一采区布置了地表移动观测站,并进行了相应的地表移动与变形监测,取得了较为完整的地表移动变形观测资料。分析了该矿的地质采矿条件,对一采区地表移动变形观测资料进行拟合计算与分析,得出如下结论:该矿千米大采深极不充分采动地表移动具有下沉平缓、下沉速度慢、移动期相对较长、无活跃阶段等特点。     

高强度开采村庄房屋的变形与破坏规律研究

根据潞安矿业集团五阳煤矿7511工作面综采放顸煤高强度开采过程中的观测资料，获得该开采条件下地表移动剧烈、变形值大、地表裂缝多、房屋破坏严重的特点，在开采工作面地表村庄内不同位置选择了4处有代表性的房屋，研究了不同结构房屋的移动变形和破坏规律，指出了高强度开采条件下的农村房屋保护技术途径．     

霍尔辛赫煤矿厚煤层开采地表移动变形规律研究

为了解决霍尔辛赫煤矿地表村庄压煤的问题,通过在地表设置观测站,分析观测数据,得到地表的变形移动规律,为本矿区的地表下沉预估提供基础参数,为煤矿安全开采留设保安煤柱提供依据。     

极不充分采动地表移动变形特点及预计

峰峰矿务局井田范围内村庄压煤量巨大，并已关系到矿井寿命，企业的可持续发展等重大问题，探索解决此问题的经验和措施意义深远。作者利用极不充分采动时地表移动变形值大幅度减小这一现象，解决了一些村庄下采煤问题，并取得了一定观测数据。本文就实测地表移动变形值的特征及预计计算等问题进行了分析与研究。研究结果认为，地表移动变形预计仍可以采用概率积分法，但应对下沉系数进行修正。本文提出了下沉系数修正公式。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。