小煤矿采空积水区综合探放技术应用分析

分析了物探、钻探、化探3种井下探测手段对掘进巷道中煤矿小窑采空积水区有效探测的可行性及实用性。通过在柳湾煤矿西翼胶带巷巷道P51点东51处进行物探工作,工作结束后根据物探结果设计钻孔并进行钻探探放水,之后采用化探技术手段分析水质类型并分析水源,通过分析与总结物探、钻探、化探工作对小煤矿采空积水区探查中发挥的作用,证明了井下多种探查手段综合应用的合理性和有效性。在井下防治小煤矿采空积水区时,该矿采用物探先行、钻探验证、化探跟进的工作方法,并将物探、钻探、化探测工作严格执行到位,相较之前的采用单一技术手段,掘进巷道中小煤矿采空积水区的防治效果得到了明显提升。     

深部应力集中区巷道变形规律的模拟研究

针对深部应力集中区巷道,采用物理模拟和数值模拟方法,研究其在高应力集中荷载作用下的变形特点。在物理模拟试验中采用数字照相量测技术进行变形分析,获得了巷道变形随时间的变化过程,以及动压作用对巷道变形的影响。在数值分析中采用多线性随动强化材料模型,针对试验结果进行对比计算分析,获得了动压情况下巷道变形、围岩塑性区的变化过程。综合分析得知深部高应力集中区巷道随时间会发生显著的收敛变形;当荷载增大时,围岩塑性区范围随之扩大,帮部围岩由于应力集中程度较高,其变形较顶底板更为显著。     

井下综合物探技术在防治水中的应用

针对矿井水患,介绍了采用瞬变电磁法和瑞利波法两种井下物探技术综合利用来解决富水区的问题。以古交运煤通道为例,探讨了综合物探技术在探测巷道底板,确定富水异常范围中的应用。并根据打钻验证,说明井下综合物探技术在探测顶底板赋水异常、采空区以及采空积水方面是行之有效的,能为井下水患预测预报提供可靠的地质技术支持,并在防治水工作中发挥重要作用。     

回采工作面井上、井下联合精细化探测技术研究

为有效探明采面及上覆煤层的采空积水区、富水区及地质构造,为疏放水提供靶区,指导大型构造附近的采面巷道布置,利用井上、井下电法、井下震法等物探技术进行精细化探测,并结合钻孔窥视技术进行异常区域验证。结果表明:以瞬变电磁法、高密度电法为主的地面物探,可从整体上控制区域不同煤层的小煤窑开采积水区和富水区域;以瞬变电磁法、槽波探测法、无线电波透视法等为主的井下物探,可更有针对性的对比和探明富水异常区,提高构造探测的横、纵向分辨率;为判别地面和井下物探效果,可采用钻孔窥视进行验证,以此对工作面形成"闭合式"精细化物探,保证采面巷道的合理布置和工作面的安全回采。     

井下活火区探测技术及应用

为查清已知采空区内煤层火烧区边界,采用综合物探进行矿区工程地质勘查;通过实例介绍了磁法、测温法等技术的原理、工作方法及在工程地质勘查中的应用效果。结论表明,综合物探在勘查井下采空区活火区边界方面,解释精度高,成果可靠,地质效果明显。     

综合物探技术在松软砂岩含水层富水性探测中的应用

以蒙东矿区敏东一矿13S101工作面为例,综合应用地面瞬变电磁和井下直流电法,对工作面顶板松软砂岩含水层的富水性进行探测,叠加圈定了疑似富水区范围。井下钻探结果表明,"地面瞬变电磁+井下直流电法"的综合物探技术能提高砂岩含水层富水性探测的精度。     

煤矿含水异常体矿井综合物探方法及应用

为实现对煤矿含水异常体的井下精细化探测,基于煤矿含水异常体类型划分及特点分析,研究了矿井物探方法特点及适用条件,并结合综合物探应用案例进行了分析。结果表明:煤矿含水异常体可分为突水水源和导水通道2大类;煤矿含水异常体精细综合物探应采用2种或2种以上的物探方法,做到地震类方法与电磁类方法相配合、同类物探方法相补充;矿井物探方法主要分为矿井电磁类方法和矿井地震类方法,矿井综合物探勘查可以按掘进头超前探测、工作面内部探测、顶底板探测进行分类,应根据含水异常体类型和特点选择适合的矿井综合物探方法;案例表明了综合物探具有良好的应用效果。     

浅层地震和瞬变电磁法在采空区探测中的应用研究

简单介绍了浅层地震和瞬变电磁技术在探测采空区的原理,并根据2种方法各自的特点,综合确定了某矿上组煤层的采空异常区和积水异常区。经井下验证,证实物探结果准确,说明通过综合物探勘查方法,可以为下组煤的安全回采提供保障。     

井下综合物探技术探测隐伏小煤窑采掘范围研究

小煤窑肆意采掘形成杂乱无序的采空区,对煤矿采掘工作面形成重大安全隐患。为了达到准确探测的目标和靶向性治理,探讨了矿井瞬变电磁法、四极测深法和矿井地质雷达法的基本原理,分析了存在隐伏小煤窑采掘情况时地层的地球物理响应特征,提出了3种物探方法相结合的井下综合物探技术,对团柏煤矿2个隐伏小煤窑井筒及采掘范围进行探测研究,并对探测结果进行了分析解释并得到钻探验证。应用表明,利用井下综合物探技术有效地探测了隐伏小煤窑井筒位置及其采掘范围,达到了对隐伏小煤窑采掘范围的多方法佐证、高精度综合探测效果,为后期针对性地治理小煤窑采空区提供可靠的技术保障。     

T-R综合物探技术探测煤矿采空积水区应用研究

为准确定位浅层煤矿中存在的采空积水区,基于现有技术理论提出了一种新型T-R综合物探技术,并依托榆树湾煤矿工程对该技术进行了检验。研究发现:T-R综合物探技术能够综合发挥TEM法和RWP法的优势,且能够实现地下地层可视化;利用该技术精确探测到了榆树湾煤矿内某埋深约150 m的采空积水区的存在,验证了该物探技术的可靠性与适用性。     

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