新安煤矿绞车基础施工技术

矿井地面建筑施工中,绞车房大体积混凝土结构浇筑、模板组装、预留洞和预埋螺栓孔的施工,常因混凝土水化热、混凝土浇筑方法、模板支护变形、设备基础螺栓孔预留精度要求高等因素,造成施工烦琐,质量控制困难,并严重影响到下一步绞车设备的安装。新安煤矿副井绞车房施工所实施的几点措施,保证了绞车基础的施工质量,基本克服了类似施工过程中经常出现的质量事故和缺陷。     

孤岛工作面沿空留巷填充技术研究与应用

以夹河煤矿-1 010 m水平9443综采工作面运输巷孤岛煤柱沿空留巷为背景,采用理论与现场试验相结合,对深部沿空留巷的填充材料及工艺技术进行研究。该矿采用墙体内布置连体木垛,煤矸石混凝土料配比填充,施工切顶锚索,锚网梁索联合支护墙体顶板,锚梁联合支护混凝土墙体等技术,强化了巷旁支护,建立了深部采场沿空留巷技术体系,达到了预期的效果,实现了矿井安全高效生产。     

恒源煤矿深部巷道围岩控制技术

在分析了恒源煤矿深部矿井巷道围岩变形破坏的原因的基础上,提出了一次支护锚网梁喷支护、二次支护锚网梁+锚索联合支护、底板支护、混凝土整体浇筑地坪的技术方案。工程实践表明,巷道围岩得到了有效支护。     

矿井窄轨高速铁路研究与建设

随着矿井机械化水平的不断提高,矿井开采水平的不断延深,井下设备、物料需求日益增长,原有大巷运输线路及运输方式已不能适应矿井的快速发展,为提高大巷运输效率,缩短设备、物料、人员的运输时间,山东能源新矿集团协庄煤矿从轨道线路、车辆调度、通讯方式等几个方面入手,在-550m水平大巷建设了一条煤矿窄轨高速铁路。     

输料孔在千万吨矿井中的应用

在超大型井田和千万吨矿井生产中,采掘后配套工程所用的混凝土、碎石材料运输已成为矿井辅助运输的重要部分,为简化辅助运输、节约成本,结合生产接续及采场布置,大柳塔煤矿在地面选取合适位置向井下施工一输料钻孔,通过钻孔将混凝土、碎石料送至井下,再经工程车送到使用地点。输料孔的应用缩短了井下混凝土、碎石材料的运输距离,降低了车辆占有率,提高了效率,满足了千万吨矿井高效生产的需求。     

庙口煤矿风井井筒静水位止浆垫防治水设计与施工

 庙口煤矿风井井筒与井底连接处（马头门）施工刚结束，模板未拆除，井筒井底水窝施工时遇水，涌水量由开始时10m3/h迅速增加至150m3/h，风井排水能力仅有50m3/h，造成风井井筒淹井。为了避免重新掘砌施工风井井筒与井底连接处及结合井筒涌水量和排水能力实际情况，采取溜灰管、排水管中套入2吋胶管同时进行静水位浇筑素灰（水泥灰）止浆垫，素灰凝固7d后排水作业，重新复浇筑商品混凝土止浆垫进行钻探防治水。实践表明，静水位浇筑素灰止浆垫强度能满足生产要求，缩短施工工期、降低投资，提高矿井经济效益。     

底板风桥在陈四楼煤矿生产中的应用

为了优化陈四楼煤矿十二采区通风系统,根据矿井生产实际,结合北翼总回风巷及十二采区运输巷的用途,充分利用已有的生产系统,设计了工程量省、施工安全便捷、影响范围小的底板风桥,通过对加强支护、设备防护、拉底施工、通风管理、瓦斯防治、架棚支护、浇筑混凝土等施工要点的管理,既安全、高效地完成了底板风桥施工,又确保了矿井生产秩序的正常,风桥实施后,支护稳定,通风可靠,效果良好。     

输料孔在千万吨矿井生产中的应用

 在超大型井田和千万吨矿井生产中，采掘后配套工程所用的混凝土、碎石材料运输已成为矿井辅助运输的重要部分，为简化辅助运输、节约成本，结合生产接续及采场布置，大柳塔煤矿在地面选取合适位置向井下施工一输料钻孔，通过钻孔将混凝土、碎石料送至井下，再经工程车送到使用地点。此举缩短了井下混凝土、碎石材料的运输距离，降低了车辆占有率，提高了效率，满足了千万吨矿井高效生产的需求。     

浅谈混凝土的冬季施工

阐述了混凝土在冬季施工中的抗压强度、原料要求以及混凝土的搅拌、运输、浇筑措施办法     

冻结法施工井壁中高强高性能混凝土研制应用

为了提高矿井混凝土结构的耐久性和安全性,针对深厚表土层冻结井壁混凝土的特点,采用优化方法,对深厚表土层冻结井壁高强高性能混凝土进行了配合比设计,研究了高强高性能混凝土的拌合物性能、力学性能、干缩、绝热温升和抗渗、抗冻、抗氯离子渗透性能.结果表明:制备的高强高性能混凝土的主要技术指标能够满足设计要求,且在龙固煤矿副井井筒成功施工井筒深度367 m,在郓城煤矿副井成功施工滑模套壁深度581 m.     

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