深井硬岩矿山岩爆防治技术综述

本文收集分析了国内外深井硬岩矿山岩爆的相关研究成果,简述了岩爆发生机理、岩爆判据和支护技术等相关内容,并在此基础上提出了深井硬岩矿山岩爆防治技术的主要发展方向,期望能为我国深井硬岩矿山开采提供指导和借鉴。     

深井高应力大断面岩巷掘进技术研究

深井掘进矿压大、地质复杂、巷道凿岩成孔困难,钻孔效率低,爆破效果差,岩巷掘进循环作业进尺小。为解决高应力坚硬围岩条件下的巷道快速钻爆问题,某矿采用了直眼中空四角柱式掏槽、多向聚能爆破、井巷定向断裂巷道轮廓成形技术,增加了循环进尺和掘进效率,减少了支护和爆破材料消耗,实现了全岩巷道快速钻爆。     

基于应力及能量条件的岩爆发生机理研究

为了研究深井硬岩巷道岩爆发生的机理,结合大台井玄武岩区岩爆工程实践,分析了区域构造应力场特征,研究了区域内煤岩体的弹性潜能分布特征.从构造应力和能量的角度出发,分析了具有岩爆倾向性的巷道围岩产生岩爆时应具备的应力条件和能量条件.研究结果表明,在具有岩爆倾向性的岩体中掘进巷道,岩爆的产生应同时具备所需的应力条件和能量条件,岩爆的位置和剧烈程度与最大主应力方向有关.研究成果将对大台井岩爆防治,深部开采的水平大巷布置和巷道支护等提供理论依据.     

千米深井高地压软岩巷道支护技术研究

口孜东矿巷道在薄基岩巨厚表土层等诸多复杂地质因素影响下,巷道呈现出高地应力软岩特性。针对巷道围岩变形破坏特征,经过了一系列的支护试验、改革及创新,总结出适应于口孜东矿深井软岩特征的系列支护形式和深井支护设计及施工原则。     

深井高地压软岩巷道“锚网索喷”联合支护技术实践

软岩巷道支护一直是影响煤矿安全开采的重要技术问题,特别是在深井高地压软岩巷道中,矿压显现更为明显,支护也更为困难。皖北煤电集团祁东矿采用"锚网索喷"联合支护技术,确定出合理的支护工艺及支护参数,并对巷道表面位移量进行了监测,有效地控制了深井高地压软岩巷道的变形破坏,取得了较好的支护效果。     

高强度 高预应力耦合支护技术在深井软岩巷道中的应用

针对小康矿深井软岩巷道失修严重,频繁翻修,安全生产形势严峻等问题,进一步开展巷道加固技术的研究,提出高强度高预应力-耦合支护技术方案,经生产实践验证,解决了深井软岩巷道支护难的问题,实现安全生产。     

破碎软岩巷道锚注支护技术研究及应用

文章针对开滦吕家坨矿深井、高应力、软岩巷道的地质特点,在应用软岩巷道支护理论研究成果的基础上,综合分析,找出影响深井、高应力、软岩巷道围岩的破坏影响因素;运用联合支护理论解释了提高巷道破碎围岩的自承能力和锚杆的锚固力,使锚杆能够起到锚固作用,从而起到了支护效果;通过现场监测分析,检验锚注支护应用效果。取得了具有一定创新意义的研究结论,其结果对深井、高应力软岩巷道支护具有一定的指导意义。     

深井软岩巷道全断面支护技术研究

深井软岩巷道支护是目前矿压界的支护难题之一。文章依据现场工程实践,通过设计有效的支护方案并优化巷道支护参数。全断面采用以注浆锚杆与注浆锚索为主的锚注联合支护,并施加以底板反底拱,及时监测矿压变化规律。结果表明,注浆锚杆与锚索在深井软岩巷道围岩中可以起到良好的支护控制效果,巷道反底拱也能够有效控制深部巷道底鼓。     

千米深井软岩巷道锚注联合加固技术在邢东矿的应用

针对冀中能源股份有限公司邢东矿千米深井巷道失修严重的现实问题,对传统支护方式做了理论分析,提出了千米深井软岩巷道锚注联合加固技术方案,该技术从根本上改变传统支护形式,使巷道支护形式从单一性向综合性改变,从单程的、单方面的支护,发展到全方位、全过程的支护.并且对深井巷道全过程实施监测监控,以监测监控数据指导深部围岩巷道支...     

浅析煤矿深井高应力软岩巷道支护技术

煤炭在我国经济建设与运行中占据着重要地位。由于我国浅部煤层资源日渐枯竭,我国很多煤矿不得不在地质条件复杂、岩层结构软弱的煤田进行深层煤炭开采,从而经常出现巷道掘进支护与维护问题。文章就煤矿深井高应力软岩巷道支护技术展开研究,论述了深部高应力软岩巷道变形破坏机制、煤矿深井高应力软岩巷道支护技术原理以及煤矿深井高应力软岩巷道支护技术的工程实践,希望能为煤矿资源的开发利用带来些许帮助。     

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     

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     

2014 second batch of rare earth quota released

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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.     

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     

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     

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.