露天矿最终帮坡角及采深协同优化研究

最终帮坡角和采深是露天矿境界设计中2个相互影响的关键参数,其取值与露天矿的安全经济性密切相关。为探讨上述2个参数的合理取值,以西藏某露天铜矿12#典型勘探线剖面为研究对象,按经验类比法初步确定该剖面西、东边帮的最终帮坡角取值范围为38°~44°,选取不同的两帮坡角度值组合,根据境界剥采比小于经济合理剥采比的原则,计算得到底部标高取值范围为+ 4 135~ + 4 108 m。构建了该剖面的露天境界最终边帮有限元数值模型,采用强度折减法计算得到西、东帮的稳定安全系数,根据实际工程设计需要的边帮安全系数以及开采的经济性,得到该剖面合理的最终帮坡角与采深。研究表明：露天边帮稳定性随着最终帮坡角和采深的增加逐渐降低,且最终帮坡角的变化对本侧边帮稳定性的影响远大于对侧边帮,两参数之间互相影响,共同决定露天矿的安全经济性;计算得到该剖面合理的西、东帮最终帮坡角分别为42°、43°,底部标高为+ 4 117 m,总采深为920 m。所采用的露天矿最终帮坡角及采深的协同优化思路可为露天矿山科学确定相关参数提供参考。     

露天矿最终帮坡角及采深协同优化研究

最终帮坡角和采深是露天矿境界设计中2个相互影响的关键参数，其取值与露天矿的安全经济性密切相关。为探讨上述2个参数的合理取值，以西藏某露天铜矿12#典型勘探线剖面为研究对象，按经验类比法初步确定该剖面西、东边帮的最终帮坡角取值范围为38°~44°，选取不同的两帮坡角度值组合，根据境界剥采比小于经济合理剥采比的原则，计算得到底部标高取值范围为+ 4 135~ + 4 108 m。构建了该剖面的露天境界最终边帮有限元数值模型，采用强度折减法计算得到西、东帮的稳定安全系数，根据实际工程设计需要的边帮安全系数以及开采的经济性，得到该剖面合理的最终帮坡角与采深。研究表明：露天边帮稳定性随着最终帮坡角和采深的增加逐渐降低，且最终帮坡角的变化对本侧边帮稳定性的影响远大于对侧边帮，两参数之间互相影响，共同决定露天矿的安全经济性；计算得到该剖面合理的西、东帮最终帮坡角分别为42°、43°，底部标高为+ 4 117 m，总采深为920 m。所采用的露天矿最终帮坡角及采深的协同优化思路可为露天矿山科学确定相关参数提供参考。     

基于锥体排除法的露天矿最终境界优化

我国经济进入新常态,钢铁冶金业大力淘汰过剩产能,加之世界铁矿市场疲软,铁矿价格持续低迷,矿山企业面临降低成本的巨大压力。对于露天矿山,提高帮坡角是充分回收资源、降低生产成本、增加矿山效益的重要手段。鉴于此,通过Opmetalminer软件建立矿床数值模型,按0.5°步长优化得到不同上盘帮坡角所对应的境界内矿岩量、总盈利、开采范围和开采深度的变化情况,通过对比分析给南芬露天矿降低生产成本提供决策。研究表明:随着帮坡角度数的提高,与基准境界相比,采出矿石量有所增加,剥离岩石量有增加有减少,总盈利增加,开采范围和开采深度在不同区域变化趋势相反。     

基于经济合理剥采比的露天矿开采境界优化

露天矿山最终开采境界的确定受到经济合理剥采比和最终边坡角的制约。依据矿体条件,选择原矿成本比较法、金属成本比较法、储量盈利比较法进行经济合理剥采比的计算和比较,3种方法计算得到的经济合理剥采比分别为10.07,11.69和13.79;结合Lerchs-Grossmann图论法,利用Micromine软件进行露天最终境界优化,得到最终帮坡角为47°、矿石量为2 450 750 m~3、岩石量为24 204 093 m~3。     

加大露天矿工作帮坡角的工艺方法与经济效果

露天矿的工作帮坡角Υp是露天开采法主要参数之一,它对露天采矿工作的效果有极大的影响。加大工作帮坡角可以改善剥采工作按日历作业进度的分配量,并可把一定的剥离工作量推迟到后期完成。例如,年产矿岩各为1000～1200万吨的金属露天矿,工作帮坡角     

基于不同二维极限平衡法的边坡稳定性研究

边坡稳定性是露天矿开采安全评价的重要影响因素,基于不同二维极限平衡法,对露天矿边坡工程地质条件进行分区,初步确定采掘场工作帮、端帮的坡角、地表境界,为矿山边坡稳定性研究提供地质依据。通过对不同的边坡滑移破坏模式进行了分析,采用STAB2009分析验算边坡稳定性,简化Bishop法计算,整体单形法优化。结果表明,非工作帮、西端帮可能的破坏模式为顺层滑移破坏模式,东端帮、工作帮可能的滑移破坏模式为圆弧滑移破坏模式,推荐了各边坡的最终帮坡角。勘察边坡稳定性揭示了露天矿开采过程中帮坡破坏模式规律。     

边坡稳定性分析与坡角加陡的综合研究

针对内蒙古霍各气铜矿原设计边坡角偏于保守的情况，本文通过对采场边坡稳定性分析计算，得出了边坡具有较大加陡潜力的结论，并且运用坡角敏感性分析的方法，确定出边坡角增加的幅度值，最终确定出最佳的采场边坡角，使矿山既能安全生产又使边坡岩石剥离量最小，达到最佳的经济效益。     

陡帮开采的经济评价及其适用条件

我国金属露天矿通常采用缓帮开采,工作帮坡角约为10～15度,很少有超过15度的.缓帮开采时,由于工作帮坡角缓,故其基建工程量大、投资大、时间长,超前剥离量大,前期生产剥采比大,露天矿的开采强度低,经济效果差.     

关于露天矿分期开采问题的探讨

分期开采的传统含义是:在露天矿最终境界内划出一个或几个中间境界,露天矿的基建和生产首先在第一期境界内进行。当上部工作台阶到达第一期境界后就停止推进,工作帮就逐步转化为临时非工作帮,后者的帮坡角等于或接近于最终帮坡角。露天矿在一期境界内均衡生产一段时间后,再恢复其上部台阶的作业,临时非工作帮又逐步转化为工作帮。通过这两     

基于SURPAC-FLAC~(3D)露天矿边坡设计及稳定性分析

以金鑫铜钼矿为工程背景,利用SURPAC和FLAC3D软件建立矿山实体计算模型,同时获得矿山剥采比和采出矿石量等经济数据。在不降低边坡安全系数的前提下,通过适当提高单台阶角度、高度和减小清扫平台宽度3种途径来增加露天矿最终边坡角度,使得最终边坡角提高2°,剥采比从3.66降低到3.52,减少岩石剥离量约1350万t,有效增加矿山企业经济效益。并在此基础上,通过FLAC3D对加陡后的露天矿山边坡进行稳定性分析,分析加陡之后的各边坡水平位移、塑性区破坏分布情况,并对加陡后较为危险的北边帮进行跟踪点监测。分析结果表明,各边坡除小范围局部不稳定外,整体处于稳定状态,可以通过局部加固来达到矿山安全开采的要求。     

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