大采高条带膏体充填采煤技术研究

为了解决"三下"压煤问题,以高河能源E1309条带膏体充填面为实例,针对E1309大采高条带面膏体充填开采的可行性和技术现状进行分析,提出了条带膏体充填开采方法,并结合高河能源E1309条带面地质特征和岩层特性,利用关键层理论计算出了满足大采高条带膏体充填开采的充填膏体的强度。结合地表沉降预测分析,证明了条带膏体充填技术在厚煤层大采高条件下可以维持顶板长期稳定。     

膏体充填条带开采技术

为了解决煤矿采空区全部充填开采成本相对偏高的问题,同时有效地控制煤矿开采地表沉陷和保证承压水上采煤的安全性,提出了煤矿膏体充填的条带开采技术,该技术以煤层顶板(关键层)、受承压水影响的底板极限垮落步距和条带煤柱留设的理论为原则,设计了膏体条带充填的充填宽度和留设宽度,并对影响条带充填体稳定的充填体尺寸、物料的配比、充填体空间的围岩岩性、地质构造和充填体侧向应力等因素进行分析。理论分析证明该技术构成的"煤层底板—充填条带—上覆岩层—主关键层"的结构体系能够有效控制地表下沉和减少底板破坏深度,达到承压水上建(构)筑下安全采煤的需求并最大程度地减少充填开采成本。     

厚煤层边角煤膏体条带充填开采技术工艺研究

为了提高矿井资源回收率,延长矿井服务年限,实现矿井绿色开采,结合高河能源目前充填开采情况,提出了矿井边角煤膏体条带充填开采技术方案,详述了膏体条带充填开采工作面布置方案、开采过程、充填开采系统布置及经济和社会效益。膏体条带充填开采不仅提高了矿井经济效益,降低矿井煤矸石外排,而且丰富了矿井充填开采技术体系。     

煤矿膏体充填开采工艺的探讨

根据煤矿绿色开采的发展要求和村庄压煤开采的迫切性，提出了膏体充填不迁村采煤技术。通过研制专用膏体充填胶结料和选择廉价的充填材料，大幅度降低了膏体充填成本，提出了适合煤矿应用的膏体充填方法，并结合某矿条件介绍了煤矿膏体充填开采的具体工艺流程。     

条带充填控制开采沉陷的理论研究

针对煤矿充填开采成本相对偏高的问题和煤系层状岩层移动与控制特点,提出了控制煤矿开采沉陷的条带充填开采方法,即在煤层采出后顶板冒落前,采用膏体胶结材料对采空区的一部分空间进行充填,构筑相间的充填条带,形成“充填条带-上覆岩层-主关键层”结构体系控制地表沉陷.研究了条带充填开采技术原理和适用性,建立了条带充填开采设计原则,并应用于某煤矿条带充填开采方案的研究.     

控制煤矿开采沉陷的部分充填开采技术研究

通过对华东某矿区采煤塌陷土地破坏与村庄搬迁赔偿费的统计分析,对煤矿充填开采技术的经济适应性和应用前景进行了探讨．针对传统充填开采成本相对偏高的问题,提出了部分充填开采的概念和3项部分充填开采技术,即采空区膏体条带充填技术、覆岩离层分区隔离注浆充填技术、条带开采冒落区注浆充填技术,分别对其技术原理进行了介绍．     

条带膏体充填开采地表沉陷研究

条带开采技术是有效解决"三下"压煤的主要技术之一。将条带开采和膏体充填两种方法有机结合,提出了条带膏体充填开采的新概念。以周源山煤矿24采区条带膏体充填开采为工程背景,基于FLAC3D软件分别对采宽、留宽均为50m的条带开采和条带膏体充填开采两种开采方案进行数值研究。研究结果表明,条带膏体充填开采的地表下沉值大于条带开采相应位置的地表下沉值,但是其下沉系数满足条带开采的允许下沉系数的要求,这说明条带开采理论应用于条带膏体充填开采中是可行的。研究结果对以后周源山煤矿24采区的充填开采有一定的指导意义,并为类似的工程实践提供一定参考。     

膏体充填采煤技术及其应用前景

膏体充填采煤技术是煤矿绿色开采的重要组成部分,其在充填材料、充填工艺、充填体对覆岩和地表沉陷控制等各方面都充分体现出煤矿绿色开采的内涵和特点。通过对不同充填开采技术优劣点比较,结合岱庄煤矿生产实际,重点对膏体充填采煤技术系统进行了介绍,包括以下几个重要组成部分:充填材料的选择、配比及不同龄期强度、工作面充填工艺及其充填成本,并对膏体充填采煤的应用前景进行了分析。     

似膏体充填建筑物下采煤可行性探讨

对结合某矿目前的开采条件，突破煤矿充填的禁区——胶结充填，从似膏体充填材料的组成和力学特性、充填开采引起的地表移动与变形以及充填成本等几个方面，分析探讨了似膏体充填建筑物下采煤的可行性。     

膏体充填开采煤层覆岩压力规律的研究

膏体充填开采既是解决"三下"开采问题的重要技术途径,也是我国顶板控制最有效的方法之一。膏体充填开采技术应降低充填工艺对顶板的影响,并使地表下沉在允许的范围内,同时尽可能减少充填材料消耗,从而为充填设计提供理论指导。本文对充填材料进行选择、对比试验以及可行性分析,介绍了充填开采的充填方式,即全采全充法和间隔充填法,模拟两种充填采煤方法的矿山压力显现,研究煤层覆岩移动规律,指出膏体充填开采方法的优越性和发展前景。     

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