爆破效果综合评价的模糊层次分析法模型

爆破效果受多种因素的制约和影响。本文建立了爆破效果综合评价的11因素模糊层次分析法模型，并以某露天矿的爆破效果为例，介绍了本模型的运用，结果表明评价结果与实际相一致。     

黑岱沟露天矿抛掷爆破效果的模糊综合评价

在露天矿抛掷爆破中,爆破效果的优劣影响到拉斗铲作业效率及露天矿生产成本。优化爆破参数,提高爆破效果具有重要的意义。以模糊数学原理为基础,通过分析选取有效抛掷率、松散系数、降震效果和炸药单耗作为评价指标,建立了黑岱沟露天煤矿抛掷爆破效果的综合评价模型,并通过对实测数据进行分析,确定了其效果等级为很好。该评价模型的建立,为露天矿抛掷爆破效果评价提供了一种有效的方法。     

露天矿爆破效果综合评价模型研究

为合理评价露天矿爆破效果,建立了组合赋权和物元可拓的露天矿爆破效果综合评价模型。从爆破安全、经济性和爆破质量3个方面,选取了8个典型影响因素,构建了露天矿爆破效果综合评价指标体系;通过序关系分析法和熵权法计算指标主观权重和客观权重,应用拉格朗日算法确定指标综合权重;通过计算单指标关联度和综合关联度,基于最大隶属度原则,综合评判爆破效果等级。以某露天石灰石矿4次爆破过程为例,进行相关计算,验证模型的有效性。结果显示,4次爆破效果综合评定分别为“好、较好、好、好”,与专家现场讨论结果相符合,且与云模型评价结果完全一致,验证了模型的可靠性。该模型计算简便、操作性强,可以为爆破效果评估提供一种新思路。     

露天矿爆破效果影响因素分析

爆破是露天矿生产的重要环节，本文根据七峰山石灰石矿多年的生产实践，从几方面简要分析了影响露天矿爆破效果的一些因素。对类似矿山的爆破实践有积极的指导意义。     

基于模糊数学-层次分析的露天矿深孔爆破效果评价研究

以经济、质量和安全要素作为一级指标,以炸药成本、合格大块率及爆破振动安全距离等13个要素作为二级指标,建立了露天矿深孔爆破效果评价模型。利用层次分析法确定该模型各级指标的权重,对定性指标量化和定量指标无量纲化处理后,采用模糊综合评判法计算评价结果和选择爆破方案。通过现场实施,该评价模型所选爆破方案能够满足爆破要求,对优化选择露天矿深孔爆破现场方案具有一定的指导意义。     

基于神经网络的爆破参数优化

针对露天矿爆破效果不理想的问题,以马家塔露天矿为依托,利用BP神经网络进行爆破参数优化,采用该矿的实际爆破参数作为样本数据对模型进行了训练。结论:该模型具有很好的容错性,该模型可以根据训练所得结果确定各因素之间权的非线性关系,并以高精度拟合出误差极低的连续性函数关系。     

安家岭露天矿深孔爆破参数优化

为了提高安家岭露天矿爆破质量降低爆破炸药单耗,安家岭露天矿对钻孔、爆破过程中孔网参数、装药结构以及在不同采装作业阶段爆量情况进行分析;采用建立地质模型、调整钻机孔网参数、爆破精细化施工、爆破效果科学评价等措施,得出了针对不同岩性提升爆破效果的爆破方案。结果表明：通过优化爆破参数达到了降低爆破振动、提高爆破质量、减少炸药单耗、提升铲装效率的目的。     

水压爆破法在露天矿大块二次爆破中的试验研究

介绍了露天矿大块二次爆破的水压爆破法和普通爆破法的对比试验，试验研究表明，水压爆破法比普通爆破法可减少飞石距离，降低炸药单耗量，提高爆破效果。     

预裂爆破效果的模糊综合评价研究

应用模糊数学原理，结合预裂控制爆破的理论，建立了预裂爆破效果综合评价模型，并通过在某露天矿山的应用得以证实。此模型的建立为定量地、比较准确地评价预裂爆破效果提供了一种实用手段。     

南芬露天矿影响中深孔爆破效果的因素及对策

本文分析了南芬露天矿影响中深孔爆破效果的因素 ,并提出了解决方法和对策 ,对改善露天矿爆破效果有一定参考价值     

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