垂直漏斗后退式采矿法在哈得逊湾矿冶公司百周年纪念矿的应用

百周年纪念矿是1970年,即曼尼托巴省成立一百周年时发现而命名的。矿体较小,贮量约200万吨,走向长度变化在400～600英尺之间,厚度10～60英尺,倾角75°。由于矿石品位低和金属价格的影响,要求降低采矿成本。该矿是采用普通分段采矿法来布置采准工程的。由于整个矿体都埋藏在一个大湖的下面,因此必须防止岩层错动,必须对采场进行水砂充填。1973年底,萨德伯里市的国际镍有限公司,采用垂直漏斗后退式采矿法(VCR 法)回采已充填的矿房之间的矿柱。实践证明,这种采矿方法已取得令人满意的结果,使用结果将由提出此法的加拿大工业公司公开发表。该法似乎有某些优点,百周年纪念矿遂选定一个矿房,用 VCR 法进行开采,而全矿生产则仍继续使用中深孔崩矿法。该试验矿房作业安全,采准费用降低,凿岩时间减少,单位炸药消耗量不高,矿石破碎良好。现在 VCR 法已为哈德逊湾矿冶公司所采纳,其应用范围也正在扩大。     

用分段连续矿房法开采倾斜中厚矿体的探讨

分段连续矿房法的实质是,在“瀑布”采矿法连续分段的基础上留矿石间柱,改矿房逐排空场崩矿为一次大量挤压崩矿,集中大量放矿,以求使矿房内崩落矿石对上盘围岩起到临时支撑作用。     

充填采矿法的改进

热兹卡兹甘矿床有些矿段矿石品位高（品位沿矿体厚度无变化），厚度大（超过18m），分一步和二步矿房以充填法回采，以保证矿量完全采出。一个盘区的回采顺序如下：一步矿房采准与回采；采空矿房充填与接顶充填；二步矿房采准与回采；采空的二步矿房充填。一步矿房以大家熟悉的浅孔崩矿工艺回采。在这种情况下，根据矿体厚度，用一个分层或分成几个分层回采’‘’。在相邻的一步采空矿房胶结充填工作结束且充填体达到必需强度之后，便开始二步矿房回采。二步矿房回采时，工人不进入采空区，只从凿岩装矿巷道钻凿扇形深孔崩矿’‘’。崩落的…     

静态留矿法在漂塘矿区的应用研究

针对浅孔留矿法开采漂塘矿区破碎矿体存在片帮、昌顶、放矿困难等回采安全问题,提出静态留矿法技术方案,并进行了工业试验。结果表明,在放矿口架设溜矿井,专用于局部放矿,使矿房内的大部分矿石保持静止,充当干式充填作用,同时避免矿石流动对上下盘围岩的摩擦、冲击和挤压,保持上下盘围岩的稳定性,为顺利回采创造条件。对该矿区而言,静态留矿法是一种安全有效的采矿方法。     

振动放矿留矿法的实践

我国薄矿脉基本上是用浅眼崩矿留矿法进行回采的.实践证明,放矿有下列问题: 1)大块卡漏斗多,漏斗修理的工作量大. 2)放矿困难,劳动条件差,工伤事故多. 3)在漏斗脊部残留烟窗状的矿石堆,要进行处理和回收这部分矿石,作业很不安全.     

国外专利简介

有用矿物矿床的开采方法这种方法是先回采矿房,用胶结充填料充填采空区,随后开采房间矿柱,再充填采空区。为了提高矿体和充填矿体垂直暴露面的稳固性,以加大阶段高度和减少矿石贫化,在开始回采整个矿房矿量之前,沿矿房全长在矿房下部从两侧进行回采。随着矿房的回采减少空区的高度,并形成顶板暴露面,它与水平面所成的倾角要大于崩落矿石的自然安息角,用胶结充填料充填已形成的下部空区之后再回采矿房矿量。从矿     

空区隐患条件下优质资源回收实践

针对北阿尔登—托普坎铅锌矿8202-3采场回采难题,经比较分析研究决定采用水平中深孔阶段崩矿嗣后充填法回收该部分矿体。详细介绍了水平中深孔阶段崩矿嗣后充填法回采工艺。现场工业试验表明,该采矿方法回采作业安全高效,取得了良好的技术经济指标,采场综合生产能力250t/d,矿石损失率10%,矿石贫化率12%。研究成果对类似矿体的安全高效回采具有一定的指导意义。     

论地下用深孔或藥室大量崩落采矿法的矿房或矿块底部结构布置方案的选择

为了成倍的提高井下开采矿山的生产能力,以满足高速度发展冶金工业出需要,在国内有色和黑色金属矿山的厚及中厚以上的矿床条件下,将日益广泛的采用深孔或药室进行大量崩矿的高生产率的开采方法:留矿法、小中段平(横)巷崩矿的空场法(矿房法),阶段强制崩落法,以及其他矿房用深孔崩矿,而矿柱在矿房充填后用崩落法回采的联合法等等。在采用这些开采方法时矿房或矿块出生产效率很高,以及由于凿岩爆破参数的改变,在增大最小抵抗线的条件下,而使要求进行二次破碎的而不合标准大块出率增多。所有由于采矿法本身特点所产生的影响因素,使得这些开采方法的矿房,或矿块底部的结构布置变     

垂直矿体走向布置矿房下盘中深孔回采技术研究与应用

石人沟铁矿三期工程矿体平均倾角为70°,垂直矿体走向布置的矿房原回采过程中垂直凿岩巷道的中深孔排面一般在矿体下盘矿岩比值为1时停止继续穿孔施工,此法造成该类矿体下盘矿石的一定损失贫化。本文依托该铁矿-210 m中段11-4~#穿M2矿房,紧贴并平行其下盘布置凿岩巷道,在该巷道内钻凿上向扇形中深孔,以已形成的空场作为自由面向空区内崩矿,从而实现对下盘矿石的回采,同时避免矿房下盘岩石的混入。     

产状复杂的金属矿床的回采试验

只有采用深孔崩矿法的强化回采工艺开采构造复杂的贵金属矿床,才能提高矿石的产量和质量。这样矿床的部分储量采用扇形深孔崩矿的分段法开采,每个分段随着崩矿和空场的形成而进行部分端部放矿。但是,围岩由于不够稳固,在矿房垂直暴露面高度尚未达到     

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。