束状孔分层落矿采矿方法研究

针对球形药包分层崩落采矿法落矿分层厚度小、采场生产能力较低的问题,基于束状孔爆破理论,研发束状孔分层落矿采矿方法。束状孔爆破具有增强破岩作用的爆破效应。4～5个炮孔组成的束状孔,采用当量球形药包装药,爆破分层高度为单孔球形药包爆破的2～3倍。束状孔分层落矿采矿方法采用束状深孔当量球形药包漏斗爆破,束状炮孔间距7～8 m,采用普通工业炸药爆破。每次分层爆破落矿高度5～8 m,贫化率8%,损失率10%,大块率<5%,采场生产能力1 800～2 400 t/d。与单孔球形药包爆破VCR法比较,大块率降低10%～20%,采场生产能力提高1倍以上。束状孔分层落矿采矿方法是一种适用于厚大矿体、中厚急倾斜矿体的大规模高效开采方法。     

束状孔等效直径当量球形药包大量落矿采矿技术

束状孔等效直径当量球形药包爆破技术是一种全新概念的爆破技术.它以数个密集平行深孔形成共同应力场的作用机理为基础,由数个束孔进行组合漏斗爆破,实现高分层大量爆破落矿.由于装药约束条件的改善,可采用普通低成本炸药,从而大大降低采矿成本.采用大参数束间距,凿岩硐室可以布置成凿岩巷道的形式,简化了采场地压管理.下向分层落矿,采场爆破避免了切割井、拉槽等低效率作业辅助工程.工业试验表明,由于创造了充分利用炸药能量和控制爆破作用的良好条件,矿岩破碎质量好、大块率低,爆破炸药单耗低、炮孔每米崩矿量高,边帮、直接顶板的完整性保护效果良好.     

束状孔当量球形药包爆破漏斗的模型研究

束状孔当量球形药包爆破是一种大量落矿的爆破技术,通过综合利用漏斗爆破最优埋深条件及增强爆破中远区破岩作用的束状孔效应,可极大提高爆破作业效率,该项技术在多个矿山开展了大规模应用试验,取得了良好的技术经济效果。开展了不同埋深条件下束状孔当量球形药包爆破漏斗试验,通过三维激光扫描仪精确扫描爆后漏斗体积,建立了束状孔药包埋深与爆破漏斗体积的关系,确定了束状孔爆破药包最佳埋深。通过分析药包埋深比与单位炸药爆破体积的关系特征,采用高斯函数进行了爆破漏斗曲线拟合,得到了爆破漏斗的高斯函数关系式。分析了单位炸药爆炸释放能量、岩石抗拉强度、药包埋深、炸药能量利用率等指标对束状孔当量球形药包爆破作用的影响,为束状孔爆破效果评价提供了定量化表征方法。根据束状孔当量球形药包爆破漏斗试验及漏斗爆破高斯函数模型,开展了4个炮孔及5个炮孔组成束状孔的爆破参数计算,确定了束状孔爆破时药包最佳埋深,为束状孔爆破设计提供了技术参考。     

束状孔大量高效采矿技术的开发与应用

基于创新的束状孔当量球形药包爆破技术与束状孔变抵抗线爆破技术开发的束状孔大量高效采矿技术,综合了球形药包爆破和深孔阶段爆破的优点,凿岩硐室布置成凿岩巷道的形式,实现高分层水平大量连续落矿及整体区域崩落采矿,开采效率高,成本低,在矿山采空区安全治理、阶段大量连续开采、露天转地下平稳过渡大量采矿等领域具有广泛的应用前景。     

采场中深孔爆破技术试验研究

在河东金矿预控顶分段空场尾砂充填采矿法采场,对切割井深孔爆破一次成井、切割槽形成、落矿爆破等中深孔爆破技术进行了试验。确定了合适的爆破参数和合理的炮孔布置,取得了良好的试验效果。     

采场中深孔爆破技术试验研究

在河东金矿预控顶分段空场尾砂充填采矿法采场，对切割井孔爆破一次成井，切割槽形成，落矿爆破等中深孔爆破技术进行了试验。确定了合适的爆破参数和合理的炮孔布置，取得了良好的试验效果。     

束状孔炮孔最佳间距的研究

束状孔炮孔的间距是决定束状孔爆破破岩有效性的关键因素。根据哈里斯模型,采用爆破漏斗试验的方法确定岩石极限抗拉应变值T,计算相邻两炮孔孔间距:;分析束状孔空隙率对炮孔联通性的影响,当束状孔内炮孔间距时,束状孔内炮孔,在爆破过程中可实现完全连通;通过爆破漏斗模型试验,建立爆破漏斗模型,爆破漏斗体积最大时的炮孔间距。综合试验结果,束状孔合理炮孔间距 。     

束状孔当量球形药包大量落矿采矿新技术研究

束状孔当量球形药包大量落矿技术，是以L·利文斯顿球形药包爆破漏斗理论和数个密集平行深孔形成共同应力场的作用机理为基础而发展的VCR 大直径深孔采矿新技术。它具有综合利用炸药能量的最优条件，既能发挥垂直深孔球形药包能量利用率高、破岩效果好的优点，又能克服其成本高、采准量大和采场地压管理复杂的缺点，具有良好的安全性、经济性和高效性，是地下大直径深孔采矿领域颇具竞争力的一项新技术。在具体论述该技术在冬瓜山铜矿的应用基础上，对其进行了综合评价，并指出了实施要领与改进方向。     

VCR法爆破漏斗试验浅析

使用VCR采矿法进行采矿时,必须就地进行爆破漏斗实验,以确定利用球状药包落矿时的爆破参数。通过对一系列直径为40 mm炮孔的爆破漏斗实验,及对实验数据进行理论分析,得出40 mm炮孔情况下的临界埋深、应变能系数等漏斗爆破参数。最后根据相似理论,计算得到了VCR法大直径球状药包落矿时的临界埋深、应变能系数、最佳埋深等爆破参数,为VCR法试验矿块孔网参数设计提供了依据。     

基于爆破漏斗试验的中深孔凿岩爆破参数研究

根据C.W.Livingston爆破漏斗理论在李楼铁矿采场进行了单孔系列爆破漏斗试验。通过试验测得爆破漏斗体积、爆破半径与药包埋深,并采用Matlab软件对试验数据进行回归分析,计算出爆破漏斗装药最佳埋置位置。通过多孔同段爆破漏斗试验,确定了炮孔的最佳孔底距和炸药单耗。根据斜面台阶爆破试验确定了爆破的炮孔排距。试验研究结果表明,在目前炸药与矿岩匹配条件下,采场中深孔凿岩爆破推荐参数为:Φ65 mm炮孔,排距1.4~1.6m,最大孔底距2.3~2.5m;Φ80mm炮孔,排距1.6~1.8m,最大孔底距2.7~2.9m;炸药单耗q值为0.45~0.49kg/t。     

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。