基于FLAC3D的上向水平分层充填法采场稳定性分析

小东沟金矿厚大矿体采用上向水平分层充填采矿法开采,合理的采场结构参数直接关系到采场稳定性和矿体开采效率。设计3种采场结构参数,建立FLAC3D数值模型进行计算。模拟结果表明,矿房开采过程中各方案最大主应力、垂直方向位移和塑性区体积均较小,开采矿柱时应力、位移和塑性区体积值均急剧增加。矿房跨度过大易导致矿柱开采过程中采场稳定性降低,增加安全隐患。最优采场结构参数为矿房宽6m,矿柱宽5m。模拟结果为小东沟金矿采场结构参数的确定提供了理论支撑。     

上向进路充填采矿法在镇北铁矿的应用及优化研究

镇北铁矿二期工程23#矿体-350～-320 m水平原设计采用阶段充填采矿法进行回采，现改为上向进路充填采矿法，缩短了采准切割时间，并通过采矿方法优化，矿柱采场采用尾砂废石混合胶结充填，矿房采场全部采用废石充填，大幅节约了充填成本，并减少了废石的提升量，进一步节约了废石的提升运输费用。此外，在回采过程中，根据采场围岩结构变化，灵活采用分段回采、留设临时矿柱等措施，确保了采场长进路、高分层回采落矿安全。     

安庆铜矿高阶段矿柱回采的充填体稳定性研究

安庆铜矿采用大直径深孔采矿法两步骤回采矿房、矿柱，其回采高度近１２０ｍ。充填体稳定性是高阶段矿柱回采过程中一个关键性技术难题。为确保尾砂胶结充填体质量，进行了充填料配比、管道输送、相似材料模型、采场充填体质量检测等试验。在矿柱回采时采取了调整落矿爆破参数、实行强化出矿与强化充填等措施，使高阶段矿柱回采得以顺利进行。     

上向水平分层充填法试验盘区回采顺序数值模拟研究

针对某金矿原采矿方法损失贫化大的难题,研究推荐机械化上向水平分层全尾砂胶结充填采矿法盘区回采工艺,在试验盘区生产时,180~194m矿体采用"一"字形同步回采,盘区稳定性良好,采场生产能力为150t/d,并节约采准工程257m;194m以上矿体采用"品"字形回采,中间采场超前相邻采场5个分层,采场生产能力为100t/d,取得高效、低贫损的良好效果。     

盘区交错式上向水平分层充填采矿法在玲南金矿的应用实践

为解决玲南金矿原有采矿方法回采作业安全性差、矿石损失贫化大、通风条件差等问题,设计采用盘区交错式上向水平分层充填采矿法作为该矿的主体采矿方法。该法将盘区内矿体划分为矿房矿柱分两步进行回采,矿房矿柱交错回采又同时向上推进。生产实践取得了采场综合生产能力105~120 t/d、矿石损失率5.8%、贫化率4.6%、采矿成本96.29元/t、充填成本32.95元/t的良好技术经济指标。     

大红山铜矿西矿段充填采矿数值模拟研究

根据大红山铜矿西矿段矿体赋存的地质条件及现有的开采技术,提出了盘区机械化分条—分层充填联合的采矿方法。初步确定18种回采的方案,选取了FLAC3D数值分析软件进行数值模拟。将各方案的结果进行了对比,选出了最好的回采方案。结果表明,采场结构参数为:用混凝土胶结充填的矿柱宽度6 m,用选矿的尾砂充填的矿房宽度8 m,每个分层的高度4 m;用混凝土胶结充填的矿柱的抗压强度2.5 MPa;开采顺序上下同时回采,间隔100 m时采场的稳定性最好。     

鸡笼山金矿采场结构参数的数值模拟分析

根据鸡笼山金矿盘区机械化分层充填采矿法的特点及工程地质与环境条件,建立了其采场模型,对其开挖过程进行了模拟分析。根据计算结果,优化确定了尾砂胶结充填体的配比及采场矿房矿柱的尺寸。     

夏甸金矿上向水平分层充填法结构参数优化的数值模拟

夏甸金矿-692 m水平以上采用点柱式上向水平分层充填法进行回采,在回采时矿房宽6 m,矿柱宽度为2 m,2 m的矿柱不回收,造成了较为严重的矿量损失。因此,对夏甸金矿-692 m水平以下的采场采用的采矿方法进行优化,采用了上向水平分层充填法进行回采。基于FLAC^3D数值模拟软件对采场结构参数优化,通过模拟不同矿房矿柱的宽度方案,观察不同方案采场中的应力、塑性区情况来确定最佳的矿房宽度和矿柱宽度。研究发现：当矿柱宽度为4 m时,其矿柱中岩体塑性变形程度低,矿柱完整性好,安全程度高,矿房宽度为5 m时,塑性区面积最小,塑性变形最弱。因此,选择矿柱宽度为4 m,矿房宽度为5 m是最佳的结构参数。     

焦家金矿立式砂仓充填系统和采矿方法的研究

<正> 山东焦家金矿是我国的重点黄金矿山,储量丰富,品位较高,由于矿体埋藏条件复杂,开采难度较大,因此决定采用充填采矿法。矿房和间柱分两步回采,即用上向水平分层胶结充填法回采矿房;再用上向水平分层尾砂充填法回采间柱。试验工作自1978年开始,于1981年9月结束,取得了良好的效果。试验采场的综合技术经济指标是:采场生产能力45～53(吨/日),采矿工效6(吨/工班),损失率13.7％,贫化率6.8％。焦家金矿自建矿以来到1981年9月用充     

充填法采场结构参数优化设计

采用弹塑性理论,综合考虑了国内某矿山矿体的赋存条件,建立了采场稳定性分析的三维有限元模型,研究了充填采矿法不同结构参数时采场的稳定性以及围岩应力和位移随矿房、矿柱尺寸以及采场控顶高度的变化情况.研究结果表明:采场最大压应力和最大拉应力随矿柱宽度增大而减少,随矿房宽度增大而增大;该矿山合理的采场结构尺寸为矿柱宽8 m,矿房宽10 m,控顶高度8～12 m.     

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     

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     

2014 second batch of rare earth quota released

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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     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.