复杂条件下综放面重型设备快速拆除技术与应用

基于郭家河煤矿1301综放工作面围岩稳定性差的复杂条件,分析研究了复杂条件下综放工作面快速拆除技术,通过合理组织拆散、运输和工作面液压支架以及配套设备拆除等工序作业,解决了设备拆除环节中的难题,工作面支架采用从中部分段向两端头拆除的方法,通过专用的无轨重型支架搬运车达到了两端头同时运输,实现了综放工作面设备安全快速拆除,获得了较好的经济效益和社会效益,为后续工作面设备快速拆除奠定了基础,并为类似条件下矿井工作面设备快速拆除提供可靠依据。     

复杂条件下综放工作面液压支架安装技术

根据综放工作面的复杂现状条件,研究了液压支架的运输安装技术,介绍了复杂条件下综放采煤工作面液压支架的运输方法、防倒架歪架技术、人员安全站位和技术创新等,总结一套行之有效的复杂条件下大型综采设备安装的工艺技术。     

大采高综放工作面机械化安装与回撤技术研究

结合宽沟煤矿W1121综放工作面机械化安装与回撤设备生产实践,论述了大采高综放工作面安装与工作面回撤工艺及其液压支架安装叉车、起重装置、回撤平台、回撤叉车、液压装车装置设备性能。重点以液压支架为例研究了工作面设备的运输、对接等安装与回撤方法,分析了其相应的优缺点。     

大倾角综放工作面支架的拆除

戚家坡煤矿S205综放工作面平均倾角32°,局部达到35°,设备拆除采用由下向上的方式,通过前期工作面与外围系统的充分准备,实现了综放工作面支架安全、快速拆除,为今后大倾角综放工作面支架回撤提供经验借鉴。     

顺槽端头支架超前支护技术

根据综放工作面超前支护的现状条件,介绍了矿井综放工作面采用的一种新型液压端头支架的结构、技术参数、设备配套和适应条件等主要技术特征,研究了端头支架的运输安装、操作使用和维护管理等技术问题,总结出一套综放工作面顺槽采用液压端头支架进行超前支护的成功技术。     

恒晋煤业井下综放支架直接倒转装备工作面技术研究与应用

本文通过制定工作面支架回撤及安装方案、倒转工艺,实现了井下综放工作面的成功直接倒转,达到了支架不升井目的,实现了综放支架的快速拆除、转运、安装,保障了矿井安全生产,缓解了接替紧张的局面。     

综放工作面拆除时预留炮采工作面切眼工艺实践

综放工作面在遇地质变化而改用单体炮采工艺回采时,采用在综放工作面拆除时预留炮采工作面切眼,即通过加大拆除支架前刷帮宽度,拆除支架时采用先支后撤的支护方式,确保留设切眼安全可靠,进而实现拆除、安装的同步进行。     

综放工作面井下拆除安装工艺

结合鹤壁煤电公司四矿井下综放设备拆除、安装的实际情况 ,介绍了综放支架拆除、安装工艺。     

综放工作面独头分段安装设备技术

为实现矿井采煤工作面在掘进准备期间就可进行综采设备安装工作,以保证矿井正常生产接续,基于综采放顶煤工作面巷道工程设计、所安装综采设备选型和安装前的准备工作基础上,介绍了综放工作面切眼巷道分阶段安装前后输送机、采煤机、液压支架、带式输送机、转载机和端头支架等综采设备过程,解决了综放工作面在切眼独头巷道掘进的同时,局部通风、端头安装空间不足和排放采空水等特殊条件下综采设备安全快速安装的安全技术问题.     

“刀把式”不等长综放工作面快速缩面的技术实践

走向长壁综采放顶煤工作面,常因断层等地质构造的影响,在推进过程中需进行工作面缩短回采,拆除工作面部分支架,以保证工作面正常回采.阐述了徐州矿务集团权台煤矿34217综放工作面拆除部分支架、缩短工作面长度的施工工艺,工期短,保证了工作面正常回采,提高了资源回收率,对不等长工作面综放采煤工艺进行了一次有益的探索.     

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