大矿房空场法回来的设计与实践

广西钢坑矿床的92号矿体为缓倾斜厚大贫锡矿体，其稳定性较差，且底顶板起伏大，在该矿体试验采用大直径平行深孔空场采矿法开采。简述了试验采场的采准、切割工程的设计，重点介绍了凿岩爆破参数的选择和爆破效果；并根据实践结果，对开采该矿体的大直径深孔孔网参数提出了建议。     

大直径深孔开采关键技术优化研究

为探索低品位厚大矿体大直径深孔开采最优方案,全面改善大直径深孔开采的技术经济指标。以乌兰矿低品位厚大矿体开采为研究对象,优化研究大直径深孔开采凿岩硐室布置方式、炮孔布置孔网参数、底部结构大直径深孔一次爆破成型工艺,开展采矿方法现场工业试验,验证优化方案的可行性并获取相关的技术经济指标。研究结果表明：凿岩硐室点柱宜采用中央条柱布置方式,条柱宽度为2 m,采场炮孔可全部设计施工为垂直孔。沿采场宽度方向布置6排炮孔,炮孔排间距宜调整为3 m,采场炮孔设计总量明显减少;大直径深孔自凿岩硐室底板施工至堑沟底部结构,通过大孔爆破崩矿一次形成堑沟底部结构,大幅降低采场采准周期。低品位厚大矿体大直径深孔开采关键技术优化,可改善低品位矿体大直径深孔开采技术经济指标,为同类矿体的高效开采技术提供借鉴。     

大直径深孔凿岩爆破参数优化研究

以某铜镍矿试验采场为研究对象,通过爆破漏斗试验、正交试验等方法对采场在回采过程中的大直径深孔凿岩爆破参数进行优化研究。重点探讨了孔底距和排距对试验采场爆破效果的影响,从而确定大直径深孔爆破最优参数。     

中深孔爆破在西藏某矿山高分段采场的试验研究

中深孔分段空场采矿法广泛应用于国内外中厚及以上矿体开采中。随着凿岩设备日趋大型化，分段空场法的分段高度也在逐渐加大，在减少开拓工程量、提高矿山生产能力的同时，也带来了因中深孔施工偏差造成的矿体开采贫损指标难以控制等问题，直接影响矿山经济效益。以西藏某矿山高分段采场开采为例，通过分析中深孔爆破参数设计原理及国内外正在实施中深孔爆破的采场技术参数，并考虑高分段造成钻机偏斜加大等因素，确定了中深孔爆破试验参数，通过多次爆破试验及生产过程中的参数优化，得到了适宜该矿山二期地下开采范围内矿岩特性的中深孔爆破参数，最终得到了大块率为4.75%，开采损失率为7.34%，贫化率为3.28%等指标，可为二期地下采场中深孔高效爆破提供技术参考。     

大直径深孔嗣后充填采矿法的应用

介绍了大直径深孔嗣后充填法在金源公司在开采J5角砾岩体中的应用。根据矿体的性质,设置该采矿方法的结构参数,并在试验采场进行了试验,确定了爆破、充填、通风等参数,得到了矿块生产能力300~500 t/d,深孔凿岩台数45 m/台班,崩矿量15.9t/m,炸药单耗0.35 kg/t,直接采矿成本34.03元/t的技术经济指标。     

高岭土矿机械化开采预先深孔松动爆破试验

为了解决煤系高岭土矿机械化开采存在顶板软弱,矿体相对煤炭质地硬,韧性大,矿石块度要求适中等难题,有必要在开采前采用预先对矿体进行充分合理的松动爆破,以提高机械切割效率及满足矿石块度适中的要求.首先研究了高岭土工作面松动爆破原理,并进行了工作面现场深孔松动控制爆破技术的试验研究,获得了该矿区高岭土矿深孔松动爆破参数.结果表明:试验采用的装药密集系数的确定较适宜,均衡充分利用了爆炸能;高岭土深孔松动爆破孔的破碎带直径大约在100～150 mm,圈内岩体呈碎屑状,裂隙带直径约在700～800 mm;采用加强松动爆破可解决高岭土机械化开采存在的难题.     

大直径深孔采矿爆破对充填体的影响分析

为了提高生产效率,安庆铜矿目前主要采用大直径深孔爆破工艺进行爆破崩矿生产,大直径深孔爆破振动效应已经对充填体造成了不同程度的影响和破坏。为确定井下采场大爆破的规模,预测和掌握爆破振动的影响范围和破坏程度,对井下大直径深孔爆破不同爆破规模、爆破方式、单段起爆药量的爆破振动速度等参数进行理论计算预测,同时开展了现场爆破振动监测试验。根据安庆铜矿采场大直径深孔爆破振动效应测试的结果,利用回归计算、理论分析等多种方法系统地研究安庆铜矿采场大直径深孔爆破振动效应对充填体的影响,进而结合安庆铜矿爆破生产的实际情况提出降低大直径深孔爆破振动强度的控制技术措施及建议。     

急倾斜薄矿体中深孔预裂爆破开采技术研究

某铜矿薄矿体主要采用浅孔留矿嗣后充填法开采,开采效率低下,贫化及损失指标难以控制。针对薄矿体开采存在的技术难题,运用中深孔对矿岩界限进行预裂爆破形成预裂缝,对矿体和围岩进行预分离。利用矿体内布置的中深孔爆破,改变矿体内岩石的稳固性,从而实现采场矿体的自然崩落落矿并与围岩进行有效的分离。研究表明:薄矿体中深孔预裂爆破开采技术通过矿岩界限预裂爆破分离矿体及围岩,矿体内炮孔爆破贯通对矿体稳固性改性后实现自然崩落落矿,能够控制采场回采边界,为采场的大规模开采创造有利的外部条件;开采技术适用于急倾斜薄矿体的地下高效开采,可大幅提高开采效率,有效控制矿体开采经济指标。     

VCR法回采工艺的试验研究

<正> VCR采矿法是大直径深孔凿岩技术、爆破理论、爆破工艺发展的结果,工艺设计一般先从采场上部的凿岩硐室打下向大直径深孔,然后用球形药包从孔的下端自下而上逐层崩矿,崩落的矿石从采场下部的出矿巷道运出。一、试验采场与试验方案设计试验采场选在凡口矿金星岭矿区—160米1~＃采场,位于金星岭2~#矿体西端,矿体为北东走向,底盘近于直立,顶盘与矿体接触面不规整,倾角60°,矿体厚度30～40米,     

大直径深孔阶段空场法开采结构参数的优化

某矿在实施大直径深孔阶段空场法开采的过程中,根据矿体的赋存条件、开采经济上的可行性和生产管理等情况,采取垂直矿体走向和沿矿体走向两种布置矿块形式。在矿岩力学性质研究的基础上,运用有限差分软件FLAC3D对该矿大直径深孔阶段空场法采场结构参数进行数值模拟研究,以确定矿块、矿房、矿柱等参数。     

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