演马庄矿井瓦斯地质规律研究

为了研究演马庄矿井瓦斯赋存地质规律,采用瓦斯赋存构造逐级控制理论,研究了矿区地质构造控气特征,提出构造分区控制瓦斯分区的瓦斯分布特征;基于矿井地质构造特征,定性、定量分析了影响矿井瓦斯赋存的主要地质因素,预测了瓦斯含量、涌出量,编制了矿井瓦斯地质图。结果表明:井田具有张裂隙延展方向总体为NE向、NNE向展布的马坊泉断层为分划性断层,富水性强的L8灰岩为瓦斯运移的主要通道,构造煤主要分布于煤层的顶板的瓦斯赋存地质规律。     

侏罗系煤田主采煤层顶板稳定性分析

煤层顶板的稳定性是影响煤层回采工作安全最重要因素之一。文章根据大量钻孔和矿井生产资料,研究了木城涧矿侏罗系煤田主采2、10号煤层顶板工程地质特征,并采用综合指数法对煤层顶板进行了综合评价。结果表明:2、10煤顶板岩性均以粉砂岩、细砂岩为主,局部见泥岩;裂隙都较为发育,顶板破碎;顶板类型以稳定和中等稳定为主。该评价结果有助于该矿加强不同区域煤层顶板的管理及安全生产工作。     

煤层顶板稳定性相关因素分析与综合评价

在对影响煤层顶板稳定性的岩体结构、直接顶厚度、地质构造、水文地质、现代地应力及采掘工程因素分析基础上，对平顶山八矿己组煤层3个生产采区煤层顶板稳定性进行了综合评价，得出现有生产采区煤层顶板条件总体上可以满足综采安全生产要求的结论。     

河东煤田局部区域煤层赋存特征的分析

该文采用构造地质学、煤地质学和矿井地质学等多学科交叉的研究思路,以河东煤田望田煤业13105工作面为例,综合分析了构造及河流冲刷影响下的地质构造和煤层分层赋存特征。取得了对井田东北部地质构造和13号煤层赋存特征的分析成果,对于矿井优化开采设计以及为河东煤田煤层赋存规律的研究具有一定的借鉴意义。     

滑动构造对煤层瓦斯赋存的影响

通过对告成井田区域地质构造特别是滑动构造进行分析研究,总结了滑动构造条件下煤层结构、煤层顶板变化与瓦斯赋存的规律,初步探讨了告成井田区域内滑动构造对二1煤瓦斯赋存的影响,用以指导矿井安全生产。     

正行煤业矿井瓦斯赋存特征及深部瓦斯预测

基于地质构造控制理论,结合区域构造演化特征,分析了正行煤业矿井地质构造、煤层埋藏深度、顶底板岩性、水文地质等因素对煤层瓦斯含量的影响,得出正行煤业矿井15~#煤层瓦斯地质规律,并运用数据回归模型对深部瓦斯含量进行了预测。     

淮南煤田13-1煤层顶板地质特征与稳定性研究

根据大量钻孔和矿井生产资料，对淮南煤田13一i煤层顶板地质条件进行了详细的分析和研究，结果表明，煤层顶板的沉积环境及沉积特征对顶板的稳定性起主要控制作用。煤层小构造和顶板岩性组合等因素影响顶板稳定性的局部变化．分流河道砂岩是稳定性最好的顶板岩性。厚层分流间湾泥岩顶板的稳定性次之，泛滥平原泥岩顶板和决口扇、潮坪砂岩顶板为不稳定或中等稳定．     

澄合董家河井田煤层顶板稳定性评价

对董家河井田5号煤层顶板稳定性特征进行分析,把影响煤层顶板稳定性的因素归纳为岩石的沉积学特征、构造特征、岩石力学性质等几个方面.综合考虑影响煤层顶板稳定性因素,建立层次分析模型,基于层次分析法和模糊综合评判理论对井田所分4个区块分别进行稳定性评价.     

基于GM(0,N)模型的井田未采区构造预测

构造预测对矿井安全生产有重要研究意义。在充分分析翟镇井田地质构造发育特征及发育规律的基础上,选取能够在侧面反映构造复杂程度的6个定量指标,在水平向以及竖直向上分别用模糊综合评判及数理统计的方法最终结合灰色分析法建立11煤层未开采区地质构造定量预测模型,对未开采区各单元构造复杂程度类型做出了综合评判。     

长平煤矿3号煤层瓦斯赋存规律分析

掌握瓦斯含量分布规律,是进行矿井瓦斯防治和煤层气抽采利用的主要依据。根据长平煤矿3号煤层瓦斯含量值及瓦斯涌出情况,结合地质构造控制理论,分析了井田地质构造对煤层瓦斯赋存特征的影响。从瓦斯地质学的角度阐述了3号煤层瓦斯赋存与井田地质构造、煤层埋藏深度、煤厚、煤层顶板岩性的关系,认为煤层埋深是影响3号煤层瓦斯赋存的主要因素,地质构造只在局部影响煤层瓦斯赋存。     

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