裂隙性矿碉微差挤压爆破的理论与实践

裂隙性矿岩属碎裂结构岩体，由于能量传递效率减低和泄压严重，极大地影响了爆破质量。经矿山多年研究与实践，采用对角线起爆的微差挤晨爆破方法，合理选择爆破参数和装药结构，大大改善了爆破效果，使爆破矿岩的大块率由３０％降到１０％左右。     

安徽省马鞍山高村采场爆破参数优化

高村采场台阶深孔爆破和预裂爆破一直沿用临近采场的爆破参数,在生产过程中发现部分爆破参数和爆破方法并非与高村采场的矿岩性质相适应,因此结合该采场的生产实际情况,进行了一系列的爆破试验。通过试验,分别得出适合坚硬矿岩和特别坚硬矿岩的爆破参数,对于特别坚硬岩石,可采用分段装药结构,对水孔采用导爆管雷管与导爆索联合起爆网路,可有效降低孔内装药不连续导致的装药困难。     

巴润矿矿岩混合复杂爆区爆破分离技术试验研究

巴润矿床成因复杂,矿体不规整、产状及空间形态无规律,爆区内常出现多矿种、众矿体和多岩性混合的矿岩分布状态。常规露天开采爆破过程使破碎矿(岩)石在爆堆中相互混合,导致矿石贫化、损失较严重。针对矿岩混合复杂爆区存在的矿体边界不清、爆破过程矿岩混合和电铲装车时难以直观辨识矿(岩)石等难题,提出了向矿(岩)体中部抛掷堆聚、矿(岩)体交界处爆破分离成清晰沟槽为核心的分离爆破技术方案。通过钻孔岩粉取样化验圈定爆区内矿(岩)体的实际边界,综合应用矿(岩)体中部等时线定向抛掷堆聚技术、矿(岩)体边界多自由面长延时对孔起爆抛掷分离技术和电子雷管精准起爆技术等,实现了爆破荷载作用下矿(岩)石有序堆聚和边界清晰分离的目标。基于颗粒流PFC3D的数值模拟研究初步确定了台阶深孔爆破矿岩分离的技术参数,在此基础上开展了现场爆破分离试验。现场爆破试验的台阶高度为14 m,炮孔直径为310 mm,孔排距为(8～10) m×6 m,采用三角形布孔方式。先行起爆紧邻矿岩分界的同排两侧炮孔,延时110 ms后同时起爆跨矿岩边界的同排两侧炮孔。爆区内以矿(岩)体中部为起爆零点的多"V"型精准起爆和等时线抛掷堆聚等技术的综合应...     

白云鄂博西矿降低矿石损失率的爆破方案优化

矿岩爆破分区研究是以矿岩混合爆区作为研究对象,将穿插于岩层中的矿体,通过合理设计起爆网络和起爆时间间隔,爆破后矿石区域与岩石区域形成比较明显的分界线,易于区分采掘,对改善和优化爆破技术具有重要的意义。针对矿岩难分穿的混合爆区,通过合理炮孔布置、设计矿岩区域起爆时间间隔、分别设置矿岩爆破抛掷方向等方法,达到减少矿石损失的目的。而对矿岩分布均匀,易于分穿分爆的区域,采用经验爆破技术即可达到分爆、分采,控制矿石损失的目的。因此,对露天采场进行矿岩爆破分区是优化爆破技术、改善爆破效果、降低矿石开采损失率的必然选择。     

黑沟矿区露天开采矿岩可爆性分级研究

针对镜铁山矿业有限公司黑沟矿区现行爆破参数设计方法缺乏理论依据导致爆破质量不稳定的问题, 分析了国内外矿岩可爆性分级方法,优选爆破作用指数法对黑沟矿区典型矿岩开展可爆性分级。在黑沟矿区典型矿 岩赋存区域,基于室内岩石力学实验、现场波速实验和单孔爆破漏斗现场实验,获得岩石强度、室内及现场波速和矿岩 的波阻抗数据;利用多旋翼摄影测量分析,获得爆破后矿岩的大块率、小块率、平均合格率等分级指标,提出一种基于 现有爆破作用指数法评价可爆性的修正方法,完成了黑沟矿区典型矿岩可爆性分级。分级结果表明灰绿色千枚岩、镜 铁矿、白云岩和铁质千枚岩的可爆性由易到难。爆破作用指数法及分级结果的修正方法能够准确描述岩体可爆性,对 规范爆破设计,改善爆破效果,优化爆破经济指标具有重要意义。     

钻孔电视在深孔爆破中的应用

某矿以炸药爆破方式剥离矿岩,因岩体局部节理裂隙发育,严重影响爆破效果和效率,尝试利用钻孔电视对钻孔的360°孔壁进行无扰动的原位连续摄像,分析岩层结构和节理裂隙,研究了裂隙发育对大块率的影响规律,就装药结构和爆破方案的改善进行了探讨。     

新集二矿井筒硬岩爆破

新集二矿立井施工中，根据相似理论进行了模拟硬岩的爆破试验，确定了硬岩爆破参数，顺利地通过了竖硬的片麻岩段，炮眼利用率达８５％以上。     

降低初次爆破单位炸药消耗量的途径

一、问题的提出爆破是目前采矿工程中破碎矿岩的主要手段。衡量爆破质量的高低是爆下矿岩的块度组成,其主要影响因素有炸药性能、药包结构、爆破方法、爆破参数、爆破工艺、岩石的性质与构造等。胡家峪矿采用垂直扇形深孔落矿的     

基于惯性导航技术的露天矿爆破过程矿岩运动规律研究

针对露天矿爆破过程中矿岩空间运动轨迹难以准确获取的问题,本研究创新性地提出了利用高精度 MEMS 惯性导航传感器高频率采集爆破过程的矿岩运动数据来生成矿岩空间运动轨迹的方法,在惯性导航技术基础 上对爆破过程中矿岩轨迹生成算法进行研究。 最后利用 MATLAB 数学软件准确输出矿岩在爆破过程中的真实空间 运动轨迹信息,为露天矿爆破过程中矿岩运动规律研究提供理论和技术依据。 以鞍钢齐大山露天矿-105 m 水平采区 为例进行了现场试验,基于试验结果分析了压渣爆破的矿岩运动规律,为露天爆破效果智能评价提供参考依据。     

矿岩爆破块度研究的现状与分析

采矿过程中,矿岩的破碎块度是评价爆破效果的重要指标,它直接影响矿山的技术方案、设备选型、经济效果等问题,甚至会严重威胁矿山连续安全生产。首先分析了矿岩爆破块度对矿山的影响,然后重点归纳总结了现阶段矿岩爆破块度的影响因素、描述方法、基本理论、预测方法,最后根据矿岩爆破块度研究的现状,通过分析得出了一些结果,为矿山爆破工程提供参考。     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

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.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

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.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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