高性能降尘泡沫的制备及应用研究

针对常规水喷雾降尘技术的不足,模拟井下供水、供气条件构建了泡沫制备试验与测试系统,设计了一种泡沫制备工艺流程,成功制备出高性能降尘泡沫,实验获得了泡沫制备的主要技术参数,并在朱仙庄矿北翼皮带机大巷和810总回风下山的综掘工作面进行了现场应用.结果表明,降尘泡沫大幅降低了掘进工作面的总粉尘和呼吸性粉尘浓度,显著提高了降尘效率,明显改善了作业环境,保障了掘进工人的身体健康.     

综掘工作面高效泡沫降尘机理及应用研究

针对综掘工作面粉尘浓度高、污染严重的现状,采取了高效泡沫降尘技术,详细分析了泡沫降尘机理,研究了采用泡沫提高降尘效率的原因,并根据综掘工作面生产条件和生产工艺设计了泡沫除尘系统各部件的工作参数和固定方式,对不同湿润剂添加比例条件下的工作面粉尘浓度进行测试,结果表明,其总粉尘降尘效率为91.4%~94.2%,显著降低了工作面的粉尘浓度。     

大阳煤矿综掘工作面泡沫降尘技术研究

随着我国煤矿机械化作业程度的提高,综掘工作面粉尘污染问题日益突出,采用泡沫降尘工艺方法可解决工作面粉尘浓度大的问题。介绍了泡沫降尘机理、泡沫降尘设备及工艺,对泡沫降尘喷头支架进行了设计。泡沫降尘系统在3303工作面回风巷综掘工作面的现场试验表明,回风巷呼入性粉尘的降尘率在73%以上,全尘的降尘率在75%以上,降尘效果显著。     

薄煤层半煤岩综掘工作面泡沫除尘技术应用

对泡沫除尘技术的除尘原理、应用条件、技术参数、应用工艺等进行了介绍;通过在滨湖煤矿薄煤层综掘工作面试用泡沫除尘技术前后分析对比,泡沫除尘技术与其它湿式抑尘相比,用水量可减少30~80%,降尘效率达到了84.43%,对呼吸性粉尘的降尘效率是68.85%。泡沫除尘技术的应用有效地降低了井下掘进工作面的粉尘浓度,取得了显著的防尘效果。     

泡沫降尘技术在转载点的应用

通过研究降尘泡沫的特点和转载点粉尘的产生机理,有针对性地设计了泡沫降尘的工艺流程。最后根据平顶山一矿明斜井机头转载点的实际情况,构建了转载点泡沫降尘系统,通过在煤仓上方安装能产生大角度的扇形泡沫喷头,覆盖产尘点,阻断粉尘扩散通道,取得了良好的效果,数据显示,泡沫降尘效率可达89.73%,对呼吸性粉尘的降尘效率也达到了83.75%,同时,降尘后悬浮空气的平均全尘浓度为6.32mg/m3,呼吸性粉尘平均浓度为4.64mg/m3,符合国家标准,降尘效果非常明显。     

矿井粉尘智能一体化防治研究及应用

为解决寺河矿综采工作面粉尘浓度过高、危害工人身体健康、影响生产安全的问题，针对造成寺河矿工作面粉尘超限的原因进行了相应分析，并对其三大主要原因采用Zigbee无线智能定位跟踪和喷雾降尘相结合的手段进行粉尘防治。通过实践对比发现：综采工作面粉尘浓度大幅下降，降尘效果显著，其中降尘率最大为87.3%。     

泡沫降尘技术在掘进工作面的研究与应用

通过研究掘进工作面产尘机理及粉尘产生过程,比较泡沫降尘技术较其他常规降尘手段所具有的优势,设计了泡沫降尘的工艺流程以及系统的安装工艺。泡沫降尘技术在新安煤矿掘进工作面的现场应用测试数据显示,泡沫对全尘的降尘效率达到84.43%,对呼吸性粉尘的降尘效率为68.85%,分别是水雾除尘的2.11倍和1.72倍,降尘效果显著。     

泡沫除尘喷雾技术及其应用实践

为了降低掘进工作面的粉尘浓度,分析了泡沫除尘的原理与综掘机割煤产生粉尘机理,对泡沫除尘成功进行了应用实践。泡沫除尘装置安装在综掘机截割部,并对比测定了割煤期间未开启喷雾、利用喷雾除尘及开启泡沫除尘装置的除尘效果。现场应用表明:泡沫除尘对于全尘的除尘率达90%以上,是普通喷雾降尘的2.03倍,尤其是对呼吸性粉尘降尘效果更为明显,是普通喷雾的2.45倍,具有极高的推广价值。     

综掘工作面高压喷雾与泡沫除尘技术应用的对比研究

针对新桥煤矿2501综掘工作面粉尘浓度高、治理困难的现状,在该工作面进行了高压喷雾与泡沫除尘技术的对比研究。介绍了高压喷雾与泡沫除尘技术的降尘机理、系统组成及设备现场布置方式,现场应用发现:泡沫除尘技术适应性较强,一次性投入较低,降尘效果较佳,更适合在2501综掘工作面应用。     

煤矿悬臂式掘进机立体综合降尘技术

平宝煤业有限公司首山一矿使用悬臂式掘进机掘进岩巷及煤-岩巷,掘进工作面粉尘大,颗粒小,吸水性差,影响工人身体健康和施工安全。通过安装和使用新型高压降尘装置——GC50/12型掘进机自动喷雾降尘装置,克服了这一问题。试用表明,该新型降尘装置能有效降低掘进机切割过程中的粉尘浓度,提高工作面能见度,改善作业环境,保障工人身体健康和施工安全,提高工程质量。     

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     

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。     

2014 second batch of rare earth quota released

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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