分层填砾钻孔结构在多层砂岩铀矿床地浸采铀中的应用

对于多层砂岩型铀矿床,必须在同一钻孔中形成2个或2个以上的过滤层,以实现同一钻孔多层不同工艺制度的开采。根据多层矿床特点,在已有单层矿体填砾式钻孔结构施工工艺基础上,采用人工隔水层和分层填砾法一次成井建造2层过滤器。实践证明,采用分层填砾法建造具有独立含水层的多层矿体过滤器,方法简单,施工连续,周期短,可以一次成井,钻孔成本较低。     

分段填砾成井工艺技术探讨

为了对同一钻孔内不同深度的2个矿层分别安装过滤器,以及阻断两过滤器之间环空通道,使两层矿之间没有水力联系,本研究试验了用分段填砾和层间水泥止水的钻孔施工工艺技术,设计了相应的分段填砾钻孔结构、成井技术方法、矿层间分割方法、封水效果监测方法和自重分割器。经实践证明,在新疆某铀矿矿区试验施工了2个分段填砾钻孔,全部取得成功,且试验成果效果良好。通过本试验研究,建立了一套可靠的分段填砾建造过滤器的地浸工艺钻孔施工技术方法,对分段填砾成井工艺的工程应用有一定指导性意义。     

过滤器布置方案对地浸采铀浸出效果的影响分析

本文以有效对流体积、有效对流矿体体积比、有效浸出矿体体积比、浸出对流体积比4种地浸采铀流场特征参数为计算分析依据,建立了一套地浸采铀流场定量化分析评价方法。基于该方法,针对内蒙古某地浸采铀矿山,开展了过滤器布置方案对地浸采铀浸出效果的影响分析,并为现场钻孔施工推荐了最优过滤器设计方案。研究结果表明：采用地浸采铀流场特征参数的定量化分析评价方法,可以对不同过滤器设计方案下的有效对流体积、有效浸出体积、浸出剂利用率等进行定量分析;各过滤器布置方案量化对比后发现,长过滤器方案形成的流场范围更大,过滤器长度大于5 m时,增加单位长度带来的增益效果降低;过滤器安装位置对有效对流体积和有效浸出体积影响明显,短过滤器方案（2.5 m）宜采用中心布置,长过滤器方案（5 m、10 m）宜采用错位布置;方案2的特征参数表现较好,为最优过滤器设计方案,在现场应用后,提高了采区抽注液量与铀浓度,更科学有效地指导了地浸采铀井场的工程设计。     

水力喷砂割缝工艺在地浸钻孔施工中的应用

采用水力喷砂割缝工艺打通了套管内外的水力联系,分析了不同施工参数对割缝效果的影响。水力喷砂割缝工艺不仅满足地浸钻孔生产要求,而且降低生产成本,减小环境污染,提高了资源开采效率。本研究可为多层矿体开发利用提供技术支持。     

新疆某陡倾疏干砂岩型铀矿开采方法探讨

结合我国铀矿开采的原地爆破浸出采铀工艺和原地浸出采铀工艺技术,提出陡倾疏干砂岩型铀矿的地下钻孔原地浸出采铀法,利用井巷工程开拓矿体,在矿块上部的注液巷道施工生产钻孔,通过钻孔将溶浸液注入矿体,然后在矿块下部的集液巷道收集浸出液。针对新疆某陡倾疏干砂岩型铀矿的地下钻孔原地浸出采铀法,设计了上盘扇形孔布液和沿脉平行孔布液2种开采方案。     

某多层砂岩型铀矿床地浸开采工艺研究

在内蒙古某CO_2+O_2地浸采铀矿山开发中,发现Ⅰ-3、Ⅱ-4矿体平面上相互重叠,属于典型的多层矿化砂岩型铀矿体。应用独立构建浸采单元的方法,分别对每层矿体独立施工钻孔,研究对多层矿体同时进行地浸开采的工艺技术。试验共设计了18组浸采单元,分别对2层矿体独立开采。浸出运行试验表明,应用该方法同时开采多层矿化砂岩型铀矿效果较好,可推广应用。     

松软砂岩型铀矿床的地浸开采技术

讨论了松软砂岩型铀矿床的地浸特点,及在浸出剂的作用下金属溶解到溶液中的过程。国外地浸采铀技术的应用侧重在钻孔施工和成井工艺、中子测井、浸出液处理、地下水污染治理及抽注状态动态模拟等方面;而新技术的开发则以埋藏深、地下水高矿化度的地浸开采为主。而国内地浸采铀技术的应用侧重在浸出过程溶液流动检测、碱法工艺、现场试验技术等方面;新技术的开发则以钻孔施工与成井工艺、翼部矿体和多层矿体开采为主。     

新型可开闭钻头在干式螺旋钻进筛管完孔工艺中的应用

针对松软破碎煤层顺层钻孔施工钻孔排渣困难、易塌孔等问题,结合干式螺旋钻进工艺和筛管完孔工艺施工方法,针对工艺需求研发了新型结构的可开闭钻头,在阳煤集团寺家庄矿使用钻头3只,累计施工钻孔10个,总进尺1057. 5m,钻头平均寿命352. 5m,最大单孔深度148m,筛管下入率达99%,应用效果良好。     

新发现

内蒙古乌兰矿区又见铜铅锌矿体武警黄金四支队在内蒙古乌兰矿区施工的一钻孔见多层铜铅锌矿体,最大矿体厚度达33.51m。据悉,该矿区规模有望进一步扩     

底抽巷穿层钻孔掩护掘进区段效果对比分析

为探究底抽巷穿层钻孔在使用不同的水力化措施以及不同布孔个数条件下掩护巷道掘进的实际效果,以余吾煤业N2203底抽巷施工穿层钻孔掩护N2203胶顺掘进为工程背景,分析底抽巷施工穿层钻孔+水力冲孔、穿层钻孔+水力割缝、穿层钻孔的3类区段以及每组9个钻孔、7个钻孔等共5类区段的瓦斯涌出情况,为余吾煤业同等条件下底抽巷穿层钻孔布置以及优化提供分析依据。     

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

正~~     

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.