麻家梁矿井风阻测定与优化分析

为合理降低矿井通风能耗、提高矿井经济效益,有效控制井下火灾风险,需准确测定矿井通风系统阻力以全面掌握通风阻力分布情况;本文首先对麻家梁矿井通风系统现状进行分析,根据矿井实际通风情况选取合适的风阻测定方式,进而得到矿井通风系统中各分区的准确风阻;最后根据风阻测定结果,对麻家梁矿井通风系统进行优化设计,提出了针对该矿井通风系统的改善方案。     

新维煤矿通风系统阻力测定及分析研究

为了掌握新维煤矿井下通风阻力分布情况,为矿井通风系统优化和合理配风提供基础资料,基于压差计逐点测定法,对通风系统中两条主要通风线路进行测量,并对结果进行准确度测验。结果表明,新维煤矿具有独立的通风系统,矿井通风系统总阻力为1381 Pa,总等积孔为3.54 m~2,矿井风属于容易时期,根据测定结果提出了合理的措施,为今后通风系统优化和安全生产提供资料。     

平煤二矿通风阻力测定及分析

根据平煤二矿的矿井概况,在通风阻力测定路线的基础上,按照选点原则布置测点,利用气压计基点法,进行通风阻力测定。通过对数据的分析,得知主测路线上阻力测定相对误差满足矿井通风阻力测定和通风系统分析的精度要求;并得出西翼风井担负系统的回风段阻力所占比例过高和三水平风井担负系统三段通风阻力分布合理的结论,在此基础上找出了西翼风井担负系统回风段阻力过大的主要原因,进而提出加强管理维护,改变回风路线、进行通风系统优化等相应的降阻措施,为煤矿的安全管理提供依据。     

晋普山煤矿通风阻力测定

矿井通风阻力大小 ,直接影响矿井通风效果 ,为掌握晋普山煤矿井下通风阻力分布情况 ,改善矿井通风系统提供参考依据 ,本文就该矿井通风阻力测定方法、测定布置进行了叙述 ,并依据测定结果 ,进行了合理分析     

恒宝源煤矿通风阻力测定与分析

为准确掌握恒宝源煤矿通风阻力分布情况,优化改造通风系统提供理论支持,采用精密气压基点测定法对其进行了井下通风阻力测定。采用3DSimOpt对测定数据进行处理和分析,得到矿井有效风量率、等积孔和三区阻力分布等指标值。根据结果可知,该矿通风阻力分布基本合理,有效风量率高达93%,为容易通风矿井。并对恒宝源矿井井下通风系统提出改进意见,进一步提升矿井通风系统的安全可靠性。     

四老沟矿通风阻力测定与分析

为便于矿井通风管理,对四老沟矿通风阻力进行测定.结果 表明,矿井通风阻力为1163.0 Pa,通风阻力分布较为合理,矿井通风系统等积孔为8.89 m2,现阶段属于容易通风矿井.但由于矿井通风系统中有5个进风井、1个回风井,应加强巷道维护,合理设置通风设施,合理配风,平衡各通风线路通风阻力,确保通风系合理运行、各通风线路稳定.     

多水平密集采煤法矿井通风阻力测定分析

大台煤矿是多水平密集开采方法,矿井通风系统较为复杂,为了详细掌握大台煤矿通风系统现状,保证矿井通风系统安全运行,采用气压基点测定法,进行了大台煤矿现场通风系统阻力测定,并对测定结果进行分析研究;揭示了矿井通风系统运行状态,利用现有技术手段结合现场实际情况,对大台煤矿矿井通风系统提出了合理化建议,通过采取一系列措施,结果实现了大台煤矿通风系统经济合理运行。     

打通一矿通风阻力分布规律研究

为全面了解打通一矿通风阻力整体分布规律,采用气压计同步法对矿井4条主要通风路线的通风阻力进行详细测定。测定结果表明:4条路线中矿井通风阻力最大为1 974.5 Pa,最大风阻为0.036 77 N·s^2/m^8,矿井通风阻力满足要求且处于通风容易阶段;通风阻力梯度整体变化较均匀,3个区段分布基本合理,部分回风巷道阻力偏大,需采取降阻措施。     

红阳三矿通风阻力测定与通风系统优化

为准确掌握红阳三矿通风阻力分布规律,为通风系统优化改造提供数据支持,应用气压计法和压差计法相结合的方式对其通风阻力进行了测定。通过对测定数据进行处理与分析,得到通风阻力、三区阻力分布、等积孔等指标。根据该类指标,分析了矿井通风系统存在的问题,并对通风系统进行了优化改造。研究表明:矿井等积孔为6.55 m2,为通风容易矿井;针对回风段阻力偏大的问题,通过采取扩大巷道断面、构筑物调节和消除局部阻力的综合措施可使南北风井阻力降低270~380 Pa。     

九顶山铜钼矿井下通风系统阻力测定结果分析与对策措施

以九顶山铜钼矿为例,系统介绍矿井通风阻力的测定方法、测点布置及测定路线选择,依据测定结果对矿井通风系统进行合理性分析,并提出降低矿井通风阻力的对策措施。为降低通风电耗、减少通风费用、减少风压损失和保证矿井安全生产提供科学的理论依据。     

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