大断面立井5m深孔控制爆破技术研究

针对思山岭铁矿副立井5m深孔控制爆破炮眼利用率低、爆破质量差的问题,提出了周边眼配合外圈浅眼控制井帮质量、间隔双管正反向装药和二阶直眼分段式掏槽的优化技术措施,并进行了现场爆破试验。结果显示:优化后的5m深孔控制爆破,炮眼利用率达到90%以上,解决了井帮超欠挖、爆破飞石等问题,提高了爆破效果,技术经济效益明显。     

中深孔爆破技术在我矿的应用

通过使用中深孔爆破技术，利用直眼掏槽，根据经验公式计算出了最优抵抗线，选取了适合的爆破参数，提高了巷道的掘进速度，减少了材料消耗。实践证明，中深孔爆破技术在煤矿中很有推广价值。     

复杂环境下露天深孔爆破技术

介绍了在复杂环境条件下露天深孔控制爆破中所遇到的爆破飞石控制、爆破振动速度控制、单孔起爆技术和爆破网路准确起爆等问题,提出了在严格控制爆破振动速度前提下,不同于一般深孔控制爆破的有关爆破参数和施工方法,并在实际工程应用中取得了很好的效果。     

中深孔爆破技术在经山寺铁矿的应用

介绍了中深孔爆破技术在经山寺矿山应用中的爆破方案、爆破参数、起爆网络的设计,及施工工艺的控制。     

采石场垂直深孔和辅助性水平深孔综合爆破技术应用

阐述了台阶上部垂直深孔爆破和坡底下辅助性水平深孔爆破综合技术在采石场开挖中的应用。结合工程实践介绍了该技术应用条件、爆破参数及施工工艺等。作为辅助性爆破,水平深孔爆破技术在采石场应用中无需飞石防护,有效克服了根底,加快了爆破进度,发挥了水平深孔爆破的优越性。     

坚硬顶板切缝药包深孔预裂松动爆破技术研究

以安徽淮南张集矿为背景,采用数值模拟和现场试验相结合的方法进行坚硬顶板松动爆破关键控制技术的研究。数值模拟了切缝药包深孔松动爆破效果,进行了普通药包爆破与切缝药包控制爆破现场对比试验。结果表明:所提出的基于切缝药包定向断裂的巨厚坚硬顶板超深孔松动预裂技术,可以扩大爆破裂纹定向扩展范围,解决超深孔松动预裂炮孔爆破底部眼间距过大的难题,从而实现对爆破破裂面及坚硬顶板的垮落位置的精准控制,以及人为调控周期来压步距,使坚硬顶板能够及时、安全垮落,实现工作面的连续安全开采。     

中深孔爆破技术在中厚矿体开采中的应用

在中厚矿体开采中,选择上向垂直扇形中深孔分段空场法开采方案,采用上向垂直扇形中深孔爆破技术,通过选择合理的爆破参数,优化爆破网络,甲、乙排扇形孔错开布置,大孔底距爆破设计,避免前排孔爆破后破坏后排孔,降低了大块率,提高了回采率,有效控制了爆破效果和爆破成本,实现了中深孔爆破分段落矿,阶段出矿的采矿工艺。     

中深孔爆破技术在回风石门掘进中的应用研究

为实现岩巷快速掘进,保证矿井的正常接替,以马兰矿回风石门作为试验地点对中深孔爆破技术进行工业试验,通过深入分析中深孔爆破相关技术,提出试验方案。试验表明,经过一段时间的磨合和参数调整,单循环爆破进尺达2.0~2.2 m,中深孔爆破较普通爆破施工炮眼及扫眼时间每循环延长约1~1.5 h,通过优化劳动组织,月循环次数与普通月循环次数基本保持不变。     

中深孔光爆掘进技术研究

中深孔光面爆破技术近来在我国煤矿得到推广应用,针对应用该技术中存在的一些施工难题,本文就掏槽眼布置方式、炮眼装药结构、预留光面层爆破工艺及参数等进行了论述,完善了该项技术.     

溜煤眼深孔爆破一次成井施工技术

文章详细介绍了溜煤眼深孔分段爆破全断面一次成井施工工艺,充分论证了深孔爆破法施工技术的科学性和可行性。     

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