银山铅锌矿九北区通风系统改造设计

简述了银山铅锌矿九区、北山区通风系统的现状、存在的问题，在通风系统测定结果、评价与分析的基础上，通过其技术、经济可行性分析，提出了2区联合通风系统的改造设计，经改造后取得了良好通风效果。     

王家寨煤矿通风系统改造与优化

王家寨煤矿为中央并列式通风，漏风量较大，主井通风阻力较大。通过对矿井通风系统进行通风阻力测定，发现矿井回风段通风阻力过大且通风难易程度为中等。针对以上情况，结合矿井下组煤的开拓对矿井通风系统进行了改造与优化。     

欢城煤矿通风阻力的测定与分析

矿井通风阻力测定是通风技术管理工作的重要内容之一。本文通过气压计基点法,选择12101工作面通风系统、12104备用面通风系统、12200掘进面通风系统、31905备用面通风系统4条有代表性的通风路线对欢城煤矿通风系统进行了阻力测定,掌握了工作面通风系统现状及其相关的技术参数,为矿井通风系统的优化及"一通三防"工作提供了基础资料。     

鄂庄燥矿通风系统改造

通过对鄂庄煤矿现通风状况与了阻力测定分析，找出影响矿井通风的高阻力段，通过通风系统改造消除高阻力段对通风的影响，以提高矿井的风量。     

方庄煤矿新井通风阻力测定与分析

采用精密气压计两点同时测量法测定方庄煤矿新井通风阻力，介绍了测点的布置原则，并进行了阻力精度评价，分析了矿井通风系统阻力状况，指出了通风系统中存在的问题，为矿井通风管理提供了可靠依据。     

王庄煤矿通风阻力测定与分析

矿井通风阻力测定工作是煤矿安全生产的一项重要工作。文章基于王庄煤矿通风阻力测定,对通风阻力测定的原理与方法作以简要介绍,并对此次通风阻力测定的结果进行了分析,同时也对通风系统中存在的问题提出了相应的措施与建议,为煤矿的通风安全管理工作提供了理论依据。     

木城涧矿通风阻力测定及降低矿井通风阻力对策

矿井通风系统是保障矿井安全的最主要的技术手段之一。通过对木城涧煤矿通风阻力进行测定,根据测定的结果全面分析了该矿井通风系统存在的问题,并对降低矿井风阻进行简要的分析。     

葛亭煤矿通风系统安全性综合评价

根据10项评价指标、权值及指标的量化计算公式，对葛亭煤矿的通风系统各项评价指标进行了量化计算，得出了矿井通风系统安全性的一个定量值，使矿井通风系统的安全性得到了客观量度。     

基点气压计法在星火煤矿通风阻力测定中的应用

矿井通风系统阻力测定是煤矿安全生产和通风安全管理的重要内容,阻力的大小直接影响矿井的通风效果.针对星火煤矿通风系统现状,采用基点气压计逐点测量法对星火煤矿通风系统进行阻力测定,根据测定结果,计算矿井总风阻及等积孔以判断通风难易程度.得出了矿井通风总阻力为1581.61 Pa,其中进风段阻力为435.84 Pa,用风段阻...     

吉尔吉斯斯坦左岸金矿深部通风系统优化设计及改造实践

随着矿山深部开拓工程的实施及年产量的增大,矿井通风常会滞后于生产,造成矿井风流紊乱、主要工作面风量不足,因此,必须适时的对通风系统进行调整和改造。本文简述了左岸金矿井下深部通风系统现状,根据通风系统的测定结果,对该通风系统存在的问题进行了分析与评价,并提出了通风系统的整改技术措施和深部优化改造方案,在实践中取得良好的效果,可供类似矿山参考。     

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。