莱新铁矿2#副井多层马头门快速施工方法

山东省莱芜市鲁中矿业集团莱新铁矿2#副井井筒深度832.402 m,马头门及相关硐室施工12层,井筒施工采用立井快速施工工法,12层马头门施工采用锚网喷临时支护掘进完毕后进行整体浇注砼的方法,保证了马头门和井筒砼的整体性,每月井筒一层马头门平均施工50 m,达到了正规循环,实现了硐室施工安全、快速、优质的目标.     

特大硐室全断面掘进施工

对掘进断面为82.47m3的大断面硐室采用上下导硐、分层分区、全断面掘进的施工顺序,临时支护、装矸运输及永久支护方法,作了较详细阐述.     

大型箕斗装载硐室与井筒同时施工技术

门克庆主立井采用全深冻结法施工;其箕斗装载硐室规格目前为国内最大,与井筒同时施工。硐室施工中,对冻结管进行了割断后焊死处理,联合使用井筒液压金属整体模板与硐室木模板浇筑混凝土,取得了很好的效果,实现了安全、优质、快速施工。     

采用全深冻结的立井井筒安全快速施工实践

以内蒙古乌审旗蒙大矿业集团虎豹湾煤矿副立井为例,简述采用全深冻结的立井井筒安全快速施工技术。因地质条件复杂,该井筒采用全深冻结,设计双层钢筋混凝土井壁结构,并设有3个壁座。井筒外壁掘砌施工期间有3个月单进超过140 m,井筒落底内壁套砌结束后施工相关硐室,并处理揭露的冻结管,对冻结管以外的空间进行注浆充填,保证了封水效果和施工安全,为类似工程施工提供了经验。     

塔山矿松软煤层中特大硐室掘进与支护技术

为了控制松软破碎煤层中特大硐室围岩变形和提高施工速度,根据变性力学机制分析,采用了高主动性、高强度、高刚度的联合支护技术,掘进采用了导硐掘进技术.施工结果表明:锚杆、锚索、喷浆、格栅混凝土砌碹联合支护方式能够有效地控制特大硐室围岩的变形,保证了支护安全,导硐掘进技术有利于特大断面硐室的施工组织,更有利于施工安全,使硐室施工实现了快速、优质、安全、高效的目的.总结出了一套松软破碎煤层中特大硐室的掘进与支护技术的经验,使大同矿区的软岩巷道支护技术水平上了一个新台阶.     

屯留煤矿主井大断面箕斗装载硐室快速施工技术

屯留煤矿主井箕斗装载硐室为双翼特大断面硐室,跨度较大,并且地质条件复杂,施工难度较大。为保证施工安全和工程质量,采用下行分层法施工,掘进时以锚网喷 锚索作临时支护,同时充分利用主井井筒施工机械化配套装备进行施工,实现了安全、优质、快速施工。     

星村煤矿井筒与硐室群整体施工实践

山东省大统矿业有限公司星村煤矿主井箕斗装载硐室及其附属工程采用与井筒一起自上而下同步掘进,边掘进边完成临时支护,最后进行永久支护的施工方案。临时支护为锚网喷,永久支护为现浇钢筋混凝土。由于施工方案合理,施工技术措施得当,实现了安全快速施工。简要介绍了施工方案、施工方法、施工技术措施及施工效果。     

基岩段立井井筒与箕斗装载硐室整体冻结技术

石拉乌素煤矿主井设计净直径9.4m,井深748.3m,全深冻结,冻结深度760m,井筒与箕斗装载硐室整体冻结,取得了良好的效果。阐述了冻结深度、冻结壁厚度、冻结壁平均温度的确定方法,给出了冻结管布置方式与整体冻结温度场实测数据。实践表明,在工程量可控的情况下,适当增加造孔工程量,在装载硐室附近形成整体冻结帷幕,对于硐室安全快速施工,意义重大。     

大型软弱岩层硐室施工

云南昭通毛坪铅锌矿盲混合井提升机硐室长18.2 m,宽13.2 m,高15.6 m,掘进断面196.19 m~2。硐室布置在软弱岩层中,采用传统的分层、分区开挖施工方法,出现多处多次垮塌现象,难以保证施工的顺利进行。通过对硐室所处区域工程地质条件的分析,确定采用构筑预护顶,自上而下分层开挖、分段支护的方法施工,顺利完成了硐室施工任务,较好地解决了软弱岩层大型硐室施工难题。     

主井箕斗装载硐室掘进施工的实践

晋昶煤矿主井箕斗装载硐室高11.46m,净跨度7m,所处层位位于二叠系下统山西组,是砂岩、泥岩、煤多岩层交互组成的复合层位,施工难度较大;采用井筒超前掘进、上中下分层施工、锚网喷+锚索+混凝土复合支护,实现了工程优质、快速、安全施工,取得了良好效果。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

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.     

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.     

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