锚注支护在不良岩体中的应用

通过对金川矿区不良岩层井巷工程支护形式的选择、喷锚支护和锚注支护基本原理的简述,阐述了锚注支护工艺的应用条件和设计施工方法。从金川矿区锚注支护的应用效果可以看出,锚注支护在不良岩层具有广泛的应用前景。     

湿喷混凝土支护在贵州某金矿的应用

湿喷混凝土支护工艺能有效改善围岩的应力状态,同时具有粉尘少,回弹率低,喷射质量高等优点。介绍湿喷混凝土支护工艺在贵州某金矿的实际应用情况,对国内其他同类矿山具有借鉴意义。     

采准巷道综合支护工艺技术及应用

支护是一项复杂的系统工程，其应用效果不仅取决于支护形式和结构参数，还受到支护时间，施工质量及维护方法等多种因素的控制，因此支护必须采取综合治理措施，才能取得好的应用效果，采准巷道综合支护工艺是根据小官庄铁矿长期实践，研究总结出一整套适用于复杂围岩环境巷支护的关键技术，对提高采准巷道支护的效果具有明显作用。     

“锚网喷”支护工艺在云南某铜矿的应用

针对云南某铜矿地质构造复杂、节理裂隙发育、地压活动强烈等特点,应用支护工艺原理,从生产实际出发,阐述了锚网喷支护工艺在云南某铜矿的应用,总结了不同工程地质条件、不同区域地段,因地制宜地选取支护工艺及支护时间,合理的对井巷工程进行维护,使开挖井巷得以顺利施工,达到安全、经济、快速施工的目的。     

煤巷锚杆支护技术在新集一矿的应用实践

分析了锚杆材料的物理力学特性、支护设计理论,重点介绍了在不同工程地质条件下煤巷高强锚杆(索)支护设计、工艺要求、施工管理等方面的应用情况,实践表明,新型锚杆支护具有支护强度大、可靠性和稳定性高等优越性。     

锚喷巷道架空人车吊装工艺优化与应用

工字钢梁悬吊猴车是一种设计新颖、技术成熟、安全实用的新型猴车安装工艺,较目前国内通常采用吊装梁安装工艺具有成本低、人工投入少、安装工期短等优点。在锚网支护应用越来越广泛的情况下,工字钢梁悬吊猴车新工艺必将获得广阔的应用前景,同时还将对锚网支护巷道的设备安装产生一定的指导意义。     

余吾煤业井下巷道支护工艺的优化研究

针对余吾煤业井下巷道支护工序多、效率低、稳定性不足的难题,提出了一种新的井下巷道支护工艺.该工艺将注浆加固、超前管棚支护、U29型钢棚支护等进行有机结合,在确保支护效率的情况下提升了巷道支护稳定性.根据实际应用表明,该工艺能够将两帮位移量降低69.5％,将顶板下沉量降低23.6％.目前该支护工艺已在多个煤矿进行了应用.     

大长工作面大断面泥岩破碎底板巷道支护工艺研究

针对泥岩底板大断面巷道变形控制难题,通过现场观察、理论计算、工程类比方式对矿井大断面泥岩破碎底板变形破坏机理及巷道支护工艺进行研究,对掘进过程中临时支护工艺与永久支护工艺进行系统分析论证,对锚杆索支护匹配性进行分析计算,最终得到临时支护下机载式支护方式;永久支护下帮部全螺纹锚杆及顶板螺纹钢锚杆+锚索联合的永久支护方式。该研究成果对相似矿井支护提供了借鉴意义,具有重大经济社会效益。     

高应力破碎岩体巷道锚网支护应用研究

主要论述锚网支护在高应力破碎岩体巷道中的应用研究,结合矿区现场实际情况得出合理的支护参数和支护工艺,并且在支护完成后及时设置测站对围岩变形进行监测以验证支护效果。通过对巷道围岩变形监控量测数据的分析,得到拱顶下沉、周边位移的变形曲线具有明显的阶段特征;同时对变形曲线进行非线性回归分析,得到围岩变形"增长模型"的非线性回归方程,为预测围岩变形规律和最终变形提供基础和依据。锚网支护有效地解决了大顶山矿区支护难的问题,同时也为具有类似情况的矿山提供了支护参考。     

宝清县乡镇煤矿采煤工作面支护改革的探索与实践

通过对小煤矿采煤支护工艺改革实践,在生产应用中取得良好的支护效果和经济效益。     

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。