掘进巷道超前钻探设计优化应用

针对C3号层一盘区2113巷前期掘进期间探放水施工效率差、探水精度低、巷道水害隐患大等技术难题,马脊梁矿通过技术研究对巷道掘进前期探水施工主要存在的问题进行分析,并根据实际生产情况对探放水施工设计进行优化,通过实际应用效果来看,2113巷探放水施工设计优化后,共计放水量为2 497 m3,探水施工后巷道未出现涌水现象,取得了预期成效。     

定向钻探技术在煤矿防治水中应用

基于传统煤矿探放水施工时,探水钻孔施工数量多、施工周期长、劳动强度、探放水效率低以及盲目性大等技术难题,为进一步提高煤矿探放水施工效率,晋能集团有限公司地质勘测部通过技术研究,对四明山煤矿9104运输顺槽掘进期间采取了定向钻探技术,通过实际应用效果来看,与传统探放水施工相比,钻探技术可减少钻孔施工数量达45个,钻孔施工长度缩短了3200m,探放水效率提高至97%以上,取得了显著应用成效。     

小煤柱工作面防治水优化设计

14203工作面为麻家梁矿井首个小煤柱工作面,面临两侧采空区积水、顶板K5砂岩裂隙水水害威胁,本次根据该工作面两顺槽巷道的防治水特点,科学合理地对该小煤柱工作面的探放水设计进行优化并严格执行,确保在顺槽巷道掘进过程中安全通过,避免掘进工作面的突水情况的发生,为以后的工作面安全顺利回采创造可靠便利条件。     

煤矿高地应力顺序开采条件下的巷道掘进支护技术

针对申南凹焦煤公司20104综采面运输顺槽掘进期间的支护质量问题,对采用锚网(索)支护顺槽巷道的支护质量、效果进行了分析和调查,提出了工作面煤柱宽度的调整、不留伪顶掘进、优化巷道断面和支护参数等具体改进措施,并在20106综采面顺槽的掘进施工应用中,产生了明显的效果。     

定向钻进技术在张集煤矿掩护巷道掘进探放水中的应用

定向钻进技术是煤矿井下深孔顺层钻进的有效手段。张集煤矿为了保证巷道掘进安全,引进该技术进行设计运输巷底部灰岩顺层探放水钻孔施工,保护范围覆盖设计巷道左侧和右侧40 m,设计钻孔3个。通过现场应用,完成1#钻孔孔深518 m,1-1#钻孔孔深483 m,2#钻孔孔深558 m,未见地层出水,成功实现了掩护巷道掘进探放水目的,并总结出"钻进岩性变化、地质资料判断、钻进方向指导、地质资料修正"探索式循环渐进钻进方法、"定向+复合"控层钻进方法和硬质岩层低速磨削开分支技巧等实践经验。张集煤矿使用顺层定向长钻孔替代了普通探放水钻孔,成为该矿掩护巷道掘进探放水钻孔施工的新技术。     

浅谈掘进巷道探放水的重要性和必要性

该文通过对正泰公司掘进巷道施工过程中经历的实际问题,对掘进巷道施工中探放水的重要意义进行了阐述,并指出了在探放水过程中需要注意的一些问题,以确保探放水施工的安全,保证煤矿掘进施工中的防治水安全。     

薄煤层开采疏放老空水实践和应用

16108工作面上部对应的12下煤层三采区采空区内存有大量积水。根据"预测预报、有疑必探、先探后掘、先治后采"的防治水原则,在16108工作面中、下顺槽掘进期间超前探放了三采区采空区积水,为以后的16煤层开采提供了重要的科学依据。     

受老空水威胁工作面巷道防治水实践

针对高庄煤矿3_上1104回风巷为沿空掘巷,巷道掘进期间受3_上1102老空水威胁,掘进开采存在严重的水患安全问题,采用超前打设疏水孔的方案来治理老空水威胁,对巷道采用调向增大护巷煤柱厚度等措施实现巷道安全快速掘进,探放水期间无淹巷情况发生,探放水后巷道顶板和上帮无淋水现象发生。     

晋城矿区胡底煤矿1309工作面探放水综合技术实践

为解决晋城矿区胡底煤矿1309工作面巷道施工安全进行,探查陷落柱富水性成为施工中的首要任务。采用井下物探、定向钻探及化探等探放水方法的综合运用,对探放水工程进行了设计优化,在1309工作面底抽巷掘进过程中,改进设计,重新调整开分支位置,解决了原探放水作业存在局部空白段及重复进尺较多的问题,为胡底煤矿防治水工作起到积极推进作用。     

掘进巷道探放水设计应用

基于15102回风顺槽掘进期间受上覆裂隙水影响,巷道掘进期间顶板平均涌水量达14m^(3)/h,不仅制约了巷道掘进效率,而且威胁着巷道施工安全,对此掌石沟煤矿通过技术研究,为了保证15102回风顺槽后期安全快速掘进,避免水灾事故发生,决定对15102回风顺槽采取合理有效的探放水施工措施,通过实际应用效果来看,采取措施后共计探放上覆裂隙水2488m^(3),取得了显著应用成效。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered