偏细粒尾矿堆坝中的新技术及其发展方向

首先提出偏细粒尾矿的基本概念,介绍偏细粒尾矿堆坝过程中存在的困难和常见问题,如坝体排渗不畅、稳定性差等,探讨当前解决偏细粒尾矿堆坝问题的基本原则,最后总结当前偏细粒尾矿堆坝中的新技术和发展方向.研究结论对偏细粒尾矿堆坝具有现实指导意义.     

上游法细粒尾砂坝垂直水平联合排渗系统设计

针对铜陵黄狮涝金矿尾矿库后期坝上游法细粒尾砂堆坝存在的尾砂渗透系数低，尾矿坝坝体浸润线高，严重影响坝体安全稳定性的问题，进行了垂直水平联合排渗系统设计，验算了设计系统的排渗量，预测了浸润线的降低深度，满足了尾矿坝工程安全稳定的要求。     

中钢集团马鞍山矿山研究院有限公司研发细粒尾矿干湿混排新方法

<正>近年来,随着经济的快速发展和矿产资源的紧缺,选矿工艺水平和回收率逐步提高,再加上尾矿中粗砂的综合应用,使得进入尾矿库内的尾砂粒径越来越细。采用传统尾矿堆排方法的尾矿堆积坝往往会遇到筑坝困难、沉积滩坡度特别缓、坝体排渗不畅、稳定性差等诸多问题。对于细粒尾矿堆排方法目前已有多种:水库式湿排、模袋法、压滤干堆等,应用较多的是水库式湿排,模袋法和压滤干堆处于尝     

软式透水管在白雉山尾矿库中的应用

尾矿坝体的稳定性与堆坝工艺、堆坝方法、尾矿性质以及排洪排渗设施密切相关，尾矿坝体的固结与排渗设施相关，降低堆积坝的浸润线，是提高尾矿坝稳定性的关键，选择新型排渗管材料势在必行，本文介绍一种新型软式透水排渗管在尾矿坝成功安装应用的实例。     

细粒尾矿堆积坝物理模型试验研究

以龙都尾矿库的设计尾矿坝为依据,按照一定的比尺堆积坝体模型,进行细粒尾矿堆积坝稳定性模型试验。通过试验验证了坝体加筋加固的作用效果,获得了加筋坝体与未加筋坝体的破坏模式,揭示出土工织物、土工格栅、土工网等3种加筋材料的加筋效果,为细粒尾矿堆积坝的稳定性研究及加固作一些新的探索。     

偏细粒尾矿新型快速堆坝方法

针对某尾矿库尾矿颗粒偏细,筑坝上升速度快,导致尾矿固结强度低的特点,采用了新型模袋筑坝方法,辅以三维排渗系统,可满足偏细粒尾矿的快速堆坝,达到尾矿库安全运行的要求,为相似条件下尾矿堆坝开辟了新的工艺方法。     

偏细粒尾矿新型快速堆坝方法

针对某尾矿库尾矿颗粒偏细,筑坝上升速度快,导致尾矿固结强度低的特点,采用了新型模袋筑坝方法,辅以三维排渗系统,可满足偏细粒尾矿的快速堆坝,达到尾矿库安全运行的要求,为相似条件下尾矿堆坝开辟了新的工艺方法。     

龙都尾矿库细粒尾矿堆坝模型试验研究

以龙都尾矿库的设计尾矿坝为依据。按照1：200的比尺堆积坝体模型，进行细粒尾矿堆积坝稳定性模型试验。通过试验验证了坝体加筋加固的作用效果，获得了加筋坝体与未加筋坝体的破坏模式，为细粒尾矿堆积坝的稳定性研究及加固作一些新的探索。     

复杂库型条件下高堆上游法尾矿坝三维渗流场分析

高堆上游法尾矿库由于水头高,渗径偏短,同时受复杂地形的夹持影响,在遭遇排渗设施失效或库水位升高等特殊工况时,坝体浸润线将抬升明显,进而影响到高坝运行安全。以国内典型的200m级上游法高堆尾矿坝为工程实例,针对该尾矿库利用三条沟谷同时堆坝这一特殊建库条件,开展尾矿坝空间渗流场研究工作,分析复杂地形下多沟谷渗流场的相互影响规律,揭示高坝浸润线易升高的关键区域及其抬升原因,并提出渗流控制措施。研究结果表明:1)受多区域渗水汇集、沟谷转角大、坝轴线收窄等复杂库型条件的综合影响,高坝渗流场的空间分布特征明显;局部浸润线相比周边区域抬高4~6m以上;2)坝体浸润线在堆积坝下半段往往贴近坝前水平排渗层内边缘通过;坝前排渗措施的有效设置对控制坝体浸润线十分关键;3)高堆尾矿坝坝体浸润线受库水位变化影响敏感,日常管理中应形成足够的库区干滩,确保尾矿坝安全运行。     

排渗盲沟布置型式对某尾矿坝渗流稳定性影响的模拟分析

为探索不同排渗盲沟布置型式对尾矿坝渗流稳定性的影响,以某尾矿库为例,通过开展无盲沟、尾粉砂中布置水平向盲沟、尾粉砂中布置垂直向+水平向排渗盲沟、尾粉土中布置水平向盲沟、尾粉土中布置垂直向+水平向排渗盲沟5种布置型式下坝体渗流场、孔隙水压力及稳定性的模拟分析。研究结果表明：尾粉土中布置垂直向+水平向排渗盲沟对坝体浸润线埋深及安全系数影响最大,并给出了不同布置型式对尾矿坝渗流及稳定性影响的大小比较,为尾矿坝排渗设计提供参考依据。     

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