东胜—神府矿区煤层顶板水害预测及防治

针对东胜—神府矿区煤层顶板水害特点,提出了煤层顶板含水层富水性探查、煤层顶板水害预测、矿井涌水量预测及其水害防治技术体系,在分析以上方法优缺点的基础上,认为井上下联合探查、钻探与物探并用及“顶板钻探+孔内物探”的思路是顶板含水层富水性探查的方向,基于GIS的煤层顶板水害预测方法的应用是提高其预测准确性的途径之一。     

榆横南区煤层顶板富水性探查研究及治理评价

煤层顶板水害严重威胁着陕北地区诸多煤矿的安全生产。以榆横南区魏墙煤矿为例进行顶板富水性探查研究,根据矿井及工作面水文地质条件分析,确定其充水水源为侏罗系延安组—直罗组砂岩裂隙含水层水,充水通道为导水裂缝带。结合物探工程和钻探工程,对煤层顶板进行探查,有效疏放顶板水约20 000 m³,同时对顶板水进行水质特征分析,判断其水质类型为SO₄-Na型。根据物探、钻探成果及水质特征分析结果,确定该矿1301工作面顶板富水区域以静储量为主,动储量补给有限,通过钻孔疏放,顶板水对工作面安全生产影响较小,可以进行正常回采。     

东滩煤矿14317工作面探放水工程设计方案

为探查东滩煤矿14317工作面顶板含水层富水性分布情况,回采前在14317工作面顺槽分别采用矿井瞬变电磁法和音频电透视技术进行了水文物探工作。对于富水异常区采用钻探验证,最终消除了水害隐患,为工作面回采提供安全保障。     

银星一号煤矿侏罗系煤层顶板砂岩水害特征及防治技术

针对宁夏银星一号煤矿存在的侏罗系煤层顶板砂岩水害问题,在梳理矿井地质及水文地质条件的基础上,分析了侏罗系煤层顶板砂岩沉积环境与富水性的直接关系,评价了砂岩含水层的富水性;在研究煤层顶板岩层力学性质、矿物成分、水稳性特征以及导水裂隙发育规律的基础上分析了侏罗系煤层顶板砂岩水害机理及特征;提出了综合运用“探、疏、排、截、监”多种措施;以基础性探查工作为前提,重点运用疏水降压技术进行水害治理的思路。110301工作面水害治理效果表明通过疏水降压治理侏罗系煤层顶板砂岩水害是可行的。     

中能煤矿回采工作面顶板水疏放研究

以物探方式探查回采工作面顶板含水层富水情况,经钻探设计后开展顶板含水层水疏放工作,有效解除了顶板含水层水对回采工作面的威胁,保障了回采工作的安全。     

基于GIS和层次分析法的煤层顶板含水层富水性评价

准确的煤层顶板含水层的富水性分区评价,可以指导矿井安全正常持续运转,避免水害发生的重要手段。煤层顶板含水层富水性评价受多种因素的影响,层次分析法可以确定出权重。再运用GIS技术将空间信息整合,形成煤层顶板含水层的富水性评价分区~([3])。     

大海则煤矿顶板富水含水层下开采水害防治研究

为了解决顶板富水含水层下开采过程中所面临的水害问题,以侏罗纪煤田榆横北区大海则煤矿为例,通过分析矿井水文地质条件,确定了主要充水水源和充水通道,计算了防隔水煤（岩）柱留设宽（厚）度,并预测了矿井开采2号煤层时的涌水量,提出了相应的防治措施。结果表明:矿井开采2号煤层时,其主要充水水源为煤层顶板侏罗系延安组、直罗组含水层水,主要充水通道为覆岩导水裂隙带。通过计算防隔水煤（岩）柱留设宽（厚）度,分析判断其在现有2号煤层开采条件下,不会受到顶板白垩系洛河组强含水层影响。采用解析法和数值法进行矿井涌水量预测,取其算术平均值作为参考。结合矿井条件和现场实际,提出井下钻探、地球物探、水文地质监测等综合防治措施,通过预防、探查、疏排、监测等手段,共同解决矿井水害问题。     

基于综合探查手段的深埋矿井工作面顶板富水性分区

以巴彦高勒煤矿311101首采工作面为例,在工作面回采前,先通过瞬变电磁法、音频电透视法相结合的物探工程,探测煤层顶板富水异常区,再布置钻探工程进行顶板水疏放,掌握钻孔涌水量和水压分布情况。综合物探和钻探工程成果,最终确定划分工作面顶板富水区。结果表明:顶板物探工程探测出6处富水异常区,施工的56个顶板水疏放钻孔中,钻孔涌水量和水压分别划分为4个数值区间,综合分析后将工作面顶板富水区划分为4个,并在工作面回采过程明显发现,每经过1处富水区时,工作面涌水量均会出现1次"阶梯式"增长,验证煤层顶板含水层富水性分区的合理性和准确性。     

常村煤矿煤层顶板涌(突)水危险性分区预测研究

针对矿井顶板水害问题,运用"三图—双预测"法对煤层顶板涌(突)水灾害进行定量评价,利用GIS的层次分析法(AHP)的耦合技术叠加分析富水性,通过GIS强大的数据管理与空间分析功能对AHP的计算结果进行处理,提出了煤层顶板充水含水层富水性分区。在煤层顶板充水含水层富水性分区与顶板冒落安全分区研究的基础上,运用多源地学信息复合叠加原理,完成了煤层顶板涌(突)水危险性的综合分区。     

长距离定向钻探技术在掘进巷道水害防治中的应用

为了对复杂水文地质条件下掘进巷道顶板含水层富水性进行探查,保障巷道的安全掘进,在巷道掘进前采用井下长距离定向钻探技术对巷道顶板含水层进行超前探测,结合钻孔钻进过程中水量实时观测资料,圈定了巷道顶板含水层的富水异常区;针对钻孔水量衰减曲线确定了巷道顶板复合含水层水力联系的空间差异性。经过实践验证,长距离定向钻孔可以更加准确地圈定掘进巷道顶板含水层的富水异常区,同时还可以查明顶板复合含水层的水力联系特征,并且对顶板含水层地下水向巷道渗流起到了显著的截流作用。结果表明:长距离定向钻探技术在复杂水文地质条件下掘进巷道顶板水害防治中具有显著的效果。     

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

正~~     

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