滨湖煤矿16煤底板奥灰水防治技术研究及应用

该文在综合分析16煤开采的水文地质条件和突水资料基础上,揭示了底板奥灰突水机理,建立了防治水技术体系,确定了16煤底板的安全开采系数,保障了矿井16煤安全开采。     

矿井水文地质条件的定量评价方法

提出了矿井水文地质条件的定量评价方法,应用该方法可以在收集矿区奥灰钻孔单位涌水量、奥灰水水压、9号煤底板至奥灰顶面的间距等6项指标的基础上,准确预测矿井开采下组煤的水文地质条件复杂程度。     

汾源煤业矿井高承压水上采煤安全性研究

石炭系太原组5号煤层开采范围内煤层底板标高为+1 100~+1 360 m,低于奥陶系灰岩含水层水位标高(+1 467 m),且处在倾斜煤层带压开采的特殊条件下,受奥灰水害威胁较大。通过对影响承压水上安全开采的主控因素综合分析,研究了隔水层的阻水能力,计算了矿井灾害涌水量,评价了5号煤层承压水上开采可行性及安全性,认为5号煤开采受奥灰水威胁比较大,突水可能性及危害性大。提出了科学的防治水措施,对矿井今后带压开采防治水有借鉴作用。     

黄河北煤田顶底板双灰岩水害分析及防治技术

为了研究黄河北煤田下组煤开采所受水害问题并制定防治方法,通过分析区内主要水害类型及其对矿井安全生产的影响,得出11煤开采主要受直接顶部四五灰涌水及底板徐灰突水威胁,同时两含水层均与奥灰存在密切水力联系;基于黄河北煤田11煤特殊水文地质条件,提出"顶板灰岩帷幕截流,底板灰岩区域治理"方法治理顶底板双灰岩水害,并应用于区内典型矿井,同时探讨了水害治理效果。结果表明底板徐灰治理效果较好,顶部四五灰帷幕需全部搭接才能检验截流效果。     

棋盘井煤矿V盘区奥灰水文地质条件分析与评价

棋盘井煤矿V盘区范围内有5、9、16号3层可采煤层,其中5号煤层是局部可采薄煤层,主采9号、16号煤层.根据近期进行的V盘区补充勘探并结合以往资料对V盘区奥灰水文地质条件进行了分析,并通过突水系数法进行了评价.结果 表明,V盘区内9号煤受底板奥灰水害威胁较小,可以实现煤层的安全开采;16号煤虽具备许多带压开采有利条件,但也有不利影响因素,V盘区DFV5逆断层导致主要煤层与奥灰含水层对接,底板水害威胁程度较高,补充勘探未对断层导水性进行探查,在临近断层进行生产采掘活动时须加强断层导水性探查,实现16号煤的带压安全开采.     

奥灰岩溶水害区域超前治理技术研究及应用

鉴于邯邢矿区大采深矿井深部煤层和下组煤开采受奥灰承压水威胁现状和保水开采需要,提出了奥灰岩溶水上带压开采水害治理的"区域超前治理"理念及"超前主动、区域治理、全面改造、带压开采"防治水指导原则;相应给出了区域分区原则、治理模式及适用条件、治查结合新方法、超前治理管理程序、底板阻水能力评价方法和治理关键技术等支撑体系。该成套技术首先在邯邢矿区进行了应用研究,特别是地面多分支水平钻进关键技术应用研究,取得了很好的安全技术效果,创新了大采深矿井和开采下组煤奥灰水害治理方法,安全开采受承压水威胁的煤炭资源,保护了煤系基底奥灰水环境。     

断层影响因子在突水危险性分区中的应用

协庄井田目前开采下组煤13煤层,其开采受徐、奥灰水威胁。为研究断层对矿井底板突水的危险性的影响,根据13煤层的地质资料,从断层的长度、落差及交点和端点的个数等特征入手,绘制断层影响因子等值线图,并根据其分布特征进行突水危险性分区,为该矿受徐、奥灰水威胁的下组煤安全开采提供基础理论资料。     

泗河煤矿下组煤底板承压水带压开采评价

下组煤开采一直受到底板奥灰水的威胁与困扰,本文对泗河煤矿下组煤底板带压开采进行了分析论证,证实矿井下组煤底板带压开采是可行的。同时,针对矿井存在奥灰水顺构造薄弱带突出的可能性的情况,给出了详实可靠的处理措施,解决了矿井煤层底板带压开采的难题     

显德汪矿9~#煤开采水文地质条件分析

显德汪矿经过对上组煤长期开采,其可采储量面临枯竭,为了延长矿井服务年限,开采受奥灰水严重威胁的9#煤势在必行。安全开采9#煤,必须查明奥灰岩溶裂隙含水层水文地质条件。通过对奥灰裂隙含水层岩溶发育特征、富水性变化规律、动态特征、9#煤之奥灰顶板之间的隔水层隔水性等水文地质条件分析认为9#煤局部安全开采可行。     

水峪煤业工作面水文地质特征及带压开采评价

山西水峪煤业十采区(宜兴区)下组煤9号煤层底板标高是+725～+65m、10+11号煤层底板标高为+720～+60m,而区内峰峰组石灰岩岩溶裂隙水水位标高为+553～+560m,下组煤(9号、10+11号煤层)大部区域存在奥灰水带压开采。如何防止奥灰水给矿井安全生产带来的影响,是十采区下组煤需要解决的水文地质问题。对矿井十采区下组煤奥灰水突水危险性进行评价,并提出防治水措施建议,为下组煤开采方案提供水文地质依据。     

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