共查询到20条相似文献,搜索用时 46 毫秒
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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。 相似文献
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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。 相似文献
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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%。 相似文献
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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。 相似文献
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<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 相似文献
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《中国稀土信息(英文版)》2014,(6)
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 相似文献
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YANG Li 《中国稀土信息(英文版)》2014,(6)
<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 相似文献
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Gao Wei 《中国稀土信息(英文版)》2014,(11)
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 相似文献
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《中国稀土信息(英文版)》2014,(8)
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 相似文献
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Bai Wenping 《中国稀土信息(英文版)》2014,(12)
<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 相似文献
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《中国稀土信息(英文版)》2014,(9)
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 相似文献
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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。 相似文献
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Chen Zhanheng 《中国稀土信息(英文版)》2014,(5)
<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 相似文献