曲线巷道施工中的质量控制

煤矿井下巷道施工过程中,为了满足生产需要,需要施工横竖曲线巷道,而横竖曲线巷道施工难度大、质量难于控制,受职工素质、管理水平影响很大,现场往往凭经验施工,难以保证巷道成型,从而影响曲线巷道行车安全。为了保证所施工曲线巷道满足安全及使用要求,在曲线巷道施工过程中通过绘制横、竖曲线大样图,控制中腰线及炮眼布置,并严格按照大样图指导施工,取得了良好的施工效果,保证了巷道质量。     

近距离立体交叉巷道掘进施工中爆破作业的精细化管理

针对蛤蟆沟煤业新建主斜井井底清煤平巷与11#煤甩车场巷道近距离立体交叉巷道施工过程中,爆破震动对巷道围岩的完整性破坏和巷道支护体强度损失问题,通过提高钻眼、爆破质量保证巷道成型质量和施工安全,对爆破作业过程中的爆破设计、施工组织实施了精细化管理,取得了较为理想、安全、可靠的施工成效。     

沿空巷道过断层掘进施工方案探讨

为解决无煤柱沿空巷道过断层掘进施工期间巷道顶板破碎、支护困难、施工安全性较低等问题,陈四楼煤矿根据现场工作的实际情况,对施工中遇到的巷道支护、顶板管理等关键环节进行研究,保证了巷道的支护质量,确保了安全施工。     

金属骨架在揭煤中做超前支护的应用

由于穿层巷道煤系段岩石松软、易破碎,使巷道掘进施工时顶板不稳定、支护难度大、安全威胁大。为了确保穿层巷道煤系段揭露煤层过程中顶板稳定、施工安全,采用在煤系段施工超前金属骨架加强支护技术。通过采用该技术很好地控制了顶板,岩层稳定,确保了安全施工,表明该项技术取得了成功,值得推广应用。     

基于QFD功能模型的煤矿巷道施工进度管理措施研究

通过对我国现有煤矿巷道施工过程中的影响巷道质量的因素进行分析,对煤矿巷道实际施工过程的特点建立QFD模型,通过对巷道施工过程的质量、安全和成本等影响因素实现QFD功能控制,对某地煤矿巷道在施工过程中的相关数据进行采集和分析后,对影响煤矿巷道施工质量的原因重要性进行了分析,提出了煤矿巷道施工进度的相关管理措施。     

巷道过断层安全生产技术措施探讨

掘进巷道过断层期间,受构造应力影响,巷道施工难度大,支护困难,而且施工期间存在很多安全隐患。店坪煤矿在二采区2003巷过断层时,提出了合理有效的巷道施工安全生产技术措施,保证了施工巷道安全快速过断层带,取得了较好效果。     

提高施工技术顺利穿过采空区

总结论述了巷道施工穿越采空区的措施及施工工序,在巷道顶与采空区间距减小的过程中,不断改变支护形式,确保了安全施工和巷道质量。     

锚喷支护新工艺在采区巷道施工中的应用

张双楼煤矿采区巷道施工中,采用锚喷支护新工艺,不仅提高了巷道支护质量,确保了巷道安全使用,还节约了支护材料费用,技术经济效益十分可观。简要介绍了锚喷支护新工艺的施工工序、施工技术要求、特点及应用效果。     

复杂条件巷道开口快速掘进与支护技术

以潞安集团余吾煤业有限公司N1206胶带顺槽掘进为实例,探讨巷道开口阶段施工安全,加快巷道开口掘进速度、降低劳动及支护成本费用;通过技术分析,对N1206胶带机头段开口采用分层掘进法,对施工巷道过巷段采取"架设钢棚+施工人工复合顶"等联合措施进行顶板维护;实际应用效果表明,加快了巷道开口掘进效率,保证巷道施工安全,取得了显著成效。     

矿井巷道大断面切眼施工与支护技术研究

井下巷道采掘交替的日益紧张,已经逐渐成为制约煤矿矿井生产作业效率增长的重要因素之一,为保证大断面巷道安全快速掘进,以高河能源矿业公司E1302工作面施工切眼为例,介绍了巷道切眼施工技术、打设点柱施工工艺与支护方法,针对E1302工作面大断面切眼施工情况,提出巷道二次切眼施工和相应的巷道支护工艺。实践证明,该工艺能够有效降低单次掘进巷道的空顶面积,实现大断面巷道的安全快速掘进。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。