基于三维激光扫描技术的地表沉降实时监测与预警

普朗铜矿自然崩落法开采会引发顶板崩落及地表沉降,地表均匀稳定的沉降尤为关键,因此实时掌握地表沉降规律是非常重要的。本文利用三维激光扫描技术,对普朗铜矿地表沉降的动态变化情况进行实时监测。通过实时监测,得出了重点监测区域的平均沉降速度,为底部结构放矿参数的优化提供了依据。三维激光扫描技术在该矿实时监测地表沉降规律中得到了很好的应用,具有较好的推广应用价值。     

基于空孔监测技术的自然崩落法顶板实时冒落规律研究

自然崩落法采矿过程中,实时掌握顶板崩落规律尤为关键。本文利用空孔监测技术,对普朗铜矿顶板崩落的动态变化情况进行监测。根据监测数据,实时获得崩落面和存窿面之间高度变化,计算出顶板平均日崩落速度,并依据设计参数动态调整底部结构的放矿计划。空孔监测技术在该矿实时监测顶板崩落规律中得到了很好的应用,具有较好的推广应用价值。     

基于空孔监测技术的自然崩落法顶板实时崩落规律研究

自然崩落法采矿过程中,实时掌握顶板崩落规律尤为关键。本文利用空孔监测技术,对普朗铜矿顶板崩落的动态变化情况进行监测。根据监测数据,实时获得崩落面和存窿面之间高度变化,计算出顶板平均日崩落速度,并依据设计参数动态调整底部结构的放矿计划。空孔监测技术在该矿实时监测顶板崩落规律中得到了很好的应用,具有较好的推广应用价值。     

微震监测自然崩落法开采过程中顶板冒落规律应用研究

微震监测技术是上覆岩层冒落规律监测的重要手段。采用微震监测系统,对普朗铜矿自然崩落法开采过程中顶板冒落规律进行实时监测和预报。在充分结合普朗铜矿开采条件下,进行微震监测系统台网布置优化,确定该矿首采区微震监测要求的最佳监测系统配置方案;总结分析微震活动的时空演化特征,并对复杂地质构造影响下岩体破裂范围进行圈定,进而识别发生顶板大范围冒落的前兆信息及潜在危险区。     

普朗铜矿地压综合监测数据分析与研究

普朗铜矿在运用自然崩落法进行拉底推进和出矿作业过程中,在断层构造影响下,面临底部结构围岩破坏变形和地表不均匀沉降等问题。因此,普朗铜矿采用微震、应力和三维激光扫描综合监测系统,对开采过程中矿山地压状况进行监测和分析。结果表明：西沿拉底推进对首采区岩体稳定性影响较大;采区南部底部结构应力变化相对频繁;地表塌陷区东部区域与沟底核心区域沉降速度最快。以上研究结果为矿山调整拉底、出矿和二次支护计划提供了参考依据,起到了良好效果。     

自然崩落法底部结构稳定性监测研究

为了掌握自然崩落法开采过程中底部结构的稳定性,采用微震监测与应力监测技术对普朗铜矿底部结构进行监测,分析出矿过程中底部结构稳定性变化规律,研究拉底推进、构造应力对底部结构稳定性的影响,评估底部结构发生失稳的风险程度.结果表明:断层构造是影响普朗铜矿底部结构稳定性的主要因素,断层下盘为开采过程中地压风险程度较高的区域;聚...     

普朗铜矿大规模开采关键技术应用研究

普朗铜矿矿石品位低、矿体厚大、矿岩易崩落、地表容许塌陷,是自然崩落法采矿的理想目标。为了保证自然崩落法的成功应用,普朗铜矿组织开展了一系列井下大规模开采关键技术研究,主要包括矿床开采技术条件、矿体可崩性与崩落矿石块度预测、高中段大面积放矿控制技术、底部结构巷道稳定性和支护技术研究等,为应用自然崩落法开采打下了基础。     

基于多源监测参数的崩落法顶板崩落规律研究

在自然崩落法开采过程中,顶板崩落高度、崩落速度等规律尤为关键,直接影响着后续采矿的进度和安全.目前单一的监测参数已经不能满足大范围、高精度顶板崩落监测的需求,针对该问题采用微震、时域反射、钻孔电视等多源监测参数对普朗铜矿顶板崩落的动态变化规律进行综合分析研究.通过微震监测参数圈定出顶板崩落的宏观范围,并以时域反射、钻孔...     

自然崩落法放矿量与底部结构应力分布关系研究

普朗铜矿运用自然崩落法进行开采,未放出的矿体作用在底部结构之上,易导致矿柱产生受压破坏,威胁底部结构稳定性。利用地压监测手段及时掌握开采过程中底部结构的应力分布情况,可锁定底部结构应力集中区域,并通过研究放矿量与底部结构应力分布的变化关系,优化和平衡各放矿口的放矿计划,调节底部结构应力分布,从而减少应力集中对底部结构的破坏。     

基于PFC2D的自然崩落法数值模拟

云南普朗铜矿是一个新建的大型铜矿山,矿山设计采用自然崩落采矿法。自然崩落法底部结构受力规律尚不明确,为了研究矿山开采中底部结构受力变化,采用PFC2D数值分析软件,针对普朗铜矿3720水平首采区地质条件及岩体物理力学参数建立计算模型并简述了岩体微观参数与宏观参数之间的关系。同时模拟分析三种拉底宽度及放矿过程中底部结构应力变化规律。结果表明:三种拉底宽度下,应力重新分布后应力集中在拉底推进线前方50~80m内,应力集中区应加强支护。随着拉底宽度的增大,峰值应力随之增大,在45m拉底宽度下最大应力达到22 MPa。在放矿时,放矿漏斗侧壁及眉线处会产生高动态应力,不利于底部结构的长期服役。研究所得结果可以对矿山支护起到指导作用。     

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。