深立井揭穿多层突出煤层技术与实践

为了缩短了揭煤工期、加快成井速度,在淮北桃园煤矿扩建工程新副立井井筒、揭穿多层深水平突出煤层的施工中,采用突出煤层快速掘进施工技术,实施探、测一体化,扫孔冲煤等新工艺,实现快速测报、消突,安全顺利揭穿共10层煤,工程实践表明:距煤垂距10 m的探、测煤一体化工艺提高了测定的准确度,节约了5 m的测压工序及指标钻测时间;扫孔冲煤工艺是立井井筒揭穿突出煤层钻孔排放措施的制胜环节.     

复杂地质条件下深井筒强突出多煤层揭煤技术

针对桃园煤矿所揭各个煤层的特点,将煤层分成两组进行揭煤管理.采用竖井工作面快速测压、快速施工排放钻孔和冲煤扫孔,加速瓦斯排放等施工技术,在此基础上形成了一套深井突出煤层快速揭煤技术体系,研发了“三步法”竖井安全揭穿突出煤层技术,成功地实现了复杂地质条件下深井筒强突出多煤层安全快速揭煤.     

淮南矿区立井揭煤段井筒加固技术

淮南矿区浅部资源已开发殆尽,新一轮矿井建设必须向深部和复杂地层延深。针对该矿区深立井井筒揭露煤层多和煤层突出危险性大、透气性差、松散破碎等突出问题,淮南矿业集团在采取一系列煤层瓦斯消突措施的同时,还专门制定了井筒揭煤段地面预注浆加固煤体等综合性加固技术措施,有效地保证了揭煤施工安全。结合工程实际,简要介绍了淮南矿区立井揭煤段井筒各项加固技术措施应用情况。     

井筒穿过突出煤层防止煤与瓦斯突出的方法

介绍了杨柳煤矿立井井筒初次穿过突出危险性煤层所设计的防突方案及具体实施方法,拟利用深孔松动爆破作用原理,增加煤层透气性,松动卸压释放瓦斯,达到消突效果。井筒施工揭煤前预测的结果为无突出危险性,直接采用震动放炮措施穿过煤层。     

基于底板瓦斯抽采导巷的小角度石门快速揭煤技术研究

朱集西煤矿中央矸石运输机巷小角度揭11-2煤层,揭煤长度达80 m左右。为了解决在揭煤工作面迎头施工突出危险性预测钻孔和预抽消突钻孔效果不理想这一问题,采用在揭煤区域煤层底板施工瓦斯抽采导巷对揭煤区域进行突出危险性预测和区域消突。实施消突措施后,残余瓦斯压力、残余瓦斯含量均远低于突出临界值,预抽钻孔工程量减少40%,揭煤时间大大缩短。     

基于底板瓦斯抽采导巷的小角度石门快速揭煤技术研究

朱集西煤矿中央矸石运输机巷小角度揭11-2煤层,揭煤长度达80 m左右。为了解决在揭煤工作面迎头施工突出危险性预测钻孔和预抽消突钻孔效果不理想这一问题,采用在揭煤区域煤层底板施工瓦斯抽采导巷对揭煤区域进行突出危险性预测和区域消突。实施消突措施后,残余瓦斯压力、残余瓦斯含量均远低于突出临界值,预抽钻孔工程量减少40%,揭煤时间大大缩短。     

高地压严重突出区域下向穿层钻孔预抽消突技术

利用工作面高抽巷施工掩护顺槽掘进工作面下向穿层条带预抽钻孔,通过对钻场底板深、浅孔注浆封堵围岩裂隙解决了孔内返水不畅难题;采取了"两堵一注"封孔方式确保封孔严密不漏气;孔内全程下吹水管,实现了单孔、分组、定时吹水工作目标,提高了下向消突钻孔抽采效果,形成了一套高效、快速的下向穿层钻孔消突管理模式,实现了高地压严重突出区域煤层高效消突以及技术经济一体化目标,安全经济效益显著。     

大埋深突出矿井箕斗井揭煤施工技术研究

针对某矿箕斗井揭煤深度大、煤层赋存条件复杂、且煤与瓦斯突出危险性大等特点,在地面预注浆的前提下,依据实际勘察的地质情况和井筒掘砌的现场条件,制定合理可行的井筒探揭煤防突安全施工技术措施。实现了深井高瓦斯矿井快速安全揭煤,对该矿井其他井筒揭煤有着重要的借鉴意义。     

快速揭煤技术在潘一矿二副井井筒施工中的应用

为了安全、快速揭过潘一东矿井第二副井13-1煤,采用先进的测压、封孔、高效的抽采钻孔施工技术,18 d安全快速揭过13-1煤,大大缩短了揭煤工期,为井筒安全、快速揭煤提供了新技术.     

余吾煤业南风井两个井筒揭煤技术方案应用效果分析

井筒揭煤是矿井综合防突的重点和难点,揭煤防突措施尤其是区域防突措施的有效实施是揭煤工作是否取得成功的关键。通过在余吾煤业南风井两个井筒实施不同的区域防突措施,验证了揭煤作业过程瓦斯抽放措施和瓦斯钻孔排放措施的消突效果,对井筒安全、快速地揭煤具有一定的借鉴作用。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。