煤矿采空区地面综合物探方法优化研究

为实现对煤矿采空区灾害的精细探测,基于采空区类型划分、地面物探方法特点及适用性研究、综合物探案例分析,进行了地面综合物探方法优化。结果表明:煤矿采空区地面精细综合探测应采用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,测网密度布置及参数设定符合探测任务要求;埋深小于50 m的极浅采空区宜采用探地雷达法和高密度电阻率法探测;埋深50~150 m的浅层采空区宜采用浅层地震法、瞬变电磁法或高密度电阻率法探测;埋深150~400 m的中深采空区宜采用地震法、瞬变电磁法、可控源音频大地电磁法或音频大地电磁法探测;埋深大于400 m的深层采空区宜采用三维地震法、可控源音频大地电磁法、音频大地电磁法或瞬变电磁法探测。     

综合物探方法在门头沟采空区探测中的应用

以门头沟煤矿采空区探测为实例,根据地下采空区的地球物理特征,利用地震反射波法、地震折射波法、音频大地电磁测深、瞬变电磁法等多种物探方法联合探测,充分发挥各种物探方法的优势,提高物探解释的精度,取得了较好的效果。     

综合物探方法在新疆阿奇山铅锌多金属找矿中的应用研究

新疆阿奇山铅锌矿区成为中大型矿床,本文分析了阿奇山矿区岩矿石物性资料特征,通过分析激电中梯、重力、可控源音频大地电磁测深、瞬变电磁测深、对称四极激电测深,对比了不同物探找矿方法的有效性,认为“剩余重力异常+可控源大地电磁测深+激电测深”找矿效果明显,总结出阿奇山铅锌矿的物探找矿标志,为研究阿奇山铅锌矿物探特征及开展地质勘查提供了一定科学依据。     

CSAMT法在煤矿采空区探测中的应用

分析总结了煤矿采空区的电性特征,阐述了利用可控源音频大地电磁测深法进行煤矿采空区探测的基本原理与工作方法,结合矿区采空区探测实例详细分析了可控源音频大地电磁测深法在煤矿采空区探测中的具体应用效果。结果表明,可控源音频大地电磁测深法能够较准确的探测出煤矿采空区及积水范围,对奥陶系高阻灰岩顶面的起伏具有较好的反映。     

物探方法在济宁某地热井勘查中的应用

利用物探方法对于查明地下地质情况,划分地层,查找地质构造具有明显优势。可控源音频大地电磁法具有探测深度大,纵向分辨能力强,穿透高阻屏蔽作用强的特点,充分发挥其特点,选用其他方法对于异常加以验证,结合测区的水文地质资料、地热成因及分布特征进行综合分析,就能为地热资源勘查开发提供地球物理依据。该文介绍可控源音频大地电磁测深法(CSAMT)和瞬变电磁法(TEM)两种方法在济宁某地地热资源勘查中的应用及验证情况。     

综合物探方法在房采采空区勘查中的应用研究

针对单一物探方法在煤矿采空区探测中的局限性和多解性问题,结合陕北侏罗纪煤田地质及地球物理特性,综合运用瞬变电磁和可控源音频大地电磁法对普泉煤矿勘探区内浅埋房柱式采空区进行探测。综合探测成果对勘探区内3-1煤层采空区和采空积水区的位置、深度、范围等信息进行了推断解释,与地质资料和验证钻孔钻探成果基本吻合。研究结果表明:瞬变电磁和可控源音频大地电磁法相结合的方法在浅埋房柱式采空区探测方面具有较高的可靠性和准确性,能够为煤矿的安全生产和采空区的综合治理提供科学依据。     

临汾矿区采空区类型划分及综合勘查应用研究

为查明临汾矿区采空区分布范围,基于综合勘查应用实践,研究了临汾矿区采空区类型,开展了采空区调查与踏勘,提出了三维地震法、瞬变电磁法和可控源音频大地电磁法相结合的综合物探勘查技术。结论表明:临汾矿区分属于河东煤田、霍西煤田和沁水煤田,42座煤矿长壁采空区分布清楚,房(巷)柱式采空区多分布不详,顶板未垮落或部分垮落;采空区多位于2、3号煤层,为连片、多层、近水平~缓倾斜、浅层~中深、大面积采空区;调查与踏勘封闭不良井口或小窑142个,蓄水池等333个,泉207处,地表裂缝或塌陷区158处;综合物探勘查实践及案例表明,综合物探结果可靠,效果良好。     

潞安矿区水文地质勘查技术及应用

通过实例介绍了瞬变电磁法,直流电法,可控源音频大地电磁法等技术的原理、工作方法及综合物探在煤矿水文地质勘查中的应用效果,结论表明,综合物探在勘查矿区水文地质方面,解释精度高,成果较可靠,地质效果明显。     

电法勘探在探测采空区及陷落柱等地质异常体中的应用

在煤矿生产和建设中,小窑采空区、陷落柱等地质异常体常因富含水或瓦斯而成为影响煤矿安全生产和建设的隐患.为解决上述问题,文章介绍了瞬变电磁法和可控源音频大地电磁法两种电法勘探方法的原理以及在探测小窑采空区积水、富水陷落柱方面的应用及取得的地质效果.实践证明,瞬变电磁法和可控源音频大地电磁法是探测小窑采空区、陷落柱等地质异常体的有效手段.     

危机矿山接替资源找矿勘查相关成矿理论与技术方法

简要叙述了与危机矿山接替资源深部和外围找矿有关的部分成矿理论和找矿方法技术研究进展。与危机矿山接替资源找矿勘查有关的成矿理论包括:绿岩带金矿新模式,浅成热液和斑岩铜矿的套叠模式,微细浸染型金矿深部找矿模式,铜镍硫化物深部找矿模式,金和铅锌矿共伴生模式等。相关的找矿技术包括时间域瞬变电磁法(TEM)、可控源音频大地电磁法(CSAMT)、金属矿地震方法、井中物探方法、深穿透地球化学方法、高精度磁法、高精度重力等。     

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