地下磁流体探测方法及其应用

矿区水害是矿产资源开采中常见的一种灾害,一旦发生事故,不仅影响生产,造成经济损失,而且易发生重大伤亡事故.地下磁流体探测装置有利于解决矿区水害问题.地下磁流体探测仪通过探针接收地球内部向地表发射的电磁波,应用现代信号分析处理技术提取地下水动态信息、裂隙信息等,有效解决矿区导水断层、老空区的探测和定性定量分析问题.地下磁流体探测装置解决了常规电法找水、防水、治水存在多解性问题.并可用于寻找或追溯采空区、溶洞、巷道等.定期对矿区周围的地下水进行监测,可掌握地下水的活动情况,保证煤矿生产安全.     

地下磁流体探测方法在煤矿水害隐患探测中的应用

煤矿水害是我国煤矿频发且较严重的事故之一，预先探明煤矿矿区水体分布及其水量是防止和避免煤矿水害事故发生的有效方法．地下水（煤矿水害事故的主体）是良导体，其流动时受到天然电磁场的作用会产生相应的特征信息，采用磁流体探测仪接收并提取该特征信息，能比较准确地对地下水的位置分布及水流的瞬时流量进行预测．阐述了地下磁流体探测方法的基本原理和工作方法，并在四川仁寿县汪洋煤矿进行了水害隐患探测验证，探明了该煤矿指定区域内的地下水体分布，准确地找出了主水仓的位置，探测结果与实际相符．     

震波探测技术在煤巷超前探测中的应用

司马矿应用震波探测仪对掘进巷道进行超前地质构造探测,并进行数据采集、处理、成图与解释,结合工作面实际揭露等情况,进行验证对比,结果说明,震波探测仪探测具有清晰明了等突出优点,解析精度高,是解决矿井超前探测地质构造,进行预测和预报的有效方法。     

地下空区激光三维探测应用研究

安全准确地探测地下空区形状,尤其是一些由于安全原因不可进入的或无法进入的空区,对空区的详查、处理以及矿山安全生产有着及其重要的作用。由于常规空区探测方法的局限,运用空区激光三维探测仪从地表对地下不可进入采空区进行了三维探测,探测结果很直观地显示了所测空区的形状。根据探测数据分析了各所测空区的基本情况,详查各开采台阶下空区的分布情况。数据经过处理后导入SURPAC和矿山各阶段CAD现状图,并用空区平面图中的网格交点顶底板标高来代替设计中需要的剖面图,为台阶爆破和空区处理提供可靠的数据。比较了通过各钻孔实测的空区高度和扫描数据中对应点的空区高度,比较结果显示,激光扫描能够满足对空区精确的三维探测。     

浅析地下管线探测

在城市基础设施施工前,施工范围内地下管线的埋深、水平位置必须弄清楚,因此施工前做地下管线探测是非常必要的.地下管线探测主要是以电磁法理论为依据,以射机发出信号,由接收机接受信号并经过处理后,得出地下管线的埋深和水平位置.地下管线探测方法多样,目前常用的各类管线探测仪均有其局限性,重点探讨非开挖定位系统在管线探测中的运用...     

地下转露天开采的采空区危害与探测技术探讨

为保证地下转露天开采顺利实施,文章进行了地下采空区危害与探测技术分析.从便于探测和处理的角度出发对地下开采形成的采空区进行了按成因分类.分析认为采空区对露天生产的危害主要体现在经济效益下降、生产接续困难、威胁生产安全和增加穿爆工作难度四个方面.地球物理方法是较为实用的采空区探测方法,其中高密度电法是现阶段实践证明最有效的单一探测方法;而机械探测法适用于疑似采空区的确认.     

金属矿隐患空区探测技术综合分析

隐患空区是矿山安全、高效开采过程中迫切需要解决的难题之一.总结了地下隐患空区探测的主要方法,对各探测方法的探测原理进行了介绍.分析了各自相应的适用条件,并综合应用探地雷达法和瑞雷波法在厂坝铅锌矿进行了地下群采空区的现场探测,基本查明了试验采场采空区的分布情况,为后续的安全回采提供了技术支撑.     

地下转露天开采矿山隐伏采空区的探测

为有效解决地下矿山转露天开采过程中隐伏采空区探测难题,以袁家村铁矿露天下部隐伏采空区为研究对象,分析了各类采空区探测方法的技术特征及应用情况.通过大量现场试验研发了一套地球物理探测、钻孔探测、三维激光扫描及声呐探测等多种技术手段相结合的探测方法,实现了对袁家村铁矿地下隐伏采空区的精准探测,成功构建了高精度采空区实体模型...     

地下管线探测方法初探

根据在地下管线探测工作中的经验和体会,总结了几个探测的心得和方法.     

高密度电阻率法在采空区探测中的应用

为探测地下老采空区的分布和规模,采用高密度电阻率法对齐大山铁矿地下采空区进行探测,通过科学布线和分析,较清楚地揭示了地下已开采区和未开采区的具体位置,说明了该方法探测地下采空区的有效性.与传统电阻率法相比,高密度电阻率法具有效率高、信息丰富、解释方便、勘探能力显著提高的特点.     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。