巴彦高勒煤矿311202采煤工作面过断层技术研究

为了降低断层对采煤工作面回采影响,以311202采煤工作面过DF19断层工程实例,提出预掘巷道深孔爆破方式辅助采煤机破岩来提高采煤工作面过断层效率。在运输巷与断层交汇处,沿断层在采煤工作面展布方向预掘巷道,在巷道内施工深孔预裂爆破孔弱化岩层。优选了预掘巷道深孔爆破下采煤工作面过断层方案,即采煤工作面与断层交线相距55.84m时按-7°俯角破底掘进并具体确定了预掘巷道内深孔爆破技术参数。采用的预掘巷道深孔爆破技术方案可实现预裂爆破与采煤工作面回采同步进行,可显著提高采煤工作面过断层效率。     

断层上山巷道顶板预应力支护技术的应用

以九采区二水平上部87层右二片回采工作面过断层为例,介绍了回采工作面过断层时,断层上山巷道顶板预应力支护技术及所取得的经济效益。     

采煤工作面断层超前治理技术研究

淮南矿区地质条件复杂,断层构造多,为了解决采煤工作面过断层期间大尺度顶板岩块超前抽冒、煤壁片帮、支架失稳、护帮护顶困难及压架等问题,研发了一种用于工作面过断层的超前预加固无机复合注浆材料,优选了"两堵一注"耐高压囊袋封孔方法及注浆机具,结合长距离钻孔测斜验证,提出了采煤工作面断层超前预注浆治理技术。依据采煤工作面中断层的产状特征及赋存条件,按照断层加固区注浆钻孔全覆盖和提高注浆钻孔利用率的思路,将工作面断层超前治理预注浆钻孔布置分为如下3种方式:(1)对于断层组或断层走向与工作面回采巷道走向夹角较小(小于45°)的单一断层构造带,可在回采巷道内垂直采煤帮布置平行递进式预注浆钻孔;(2)对于断层走向与工作面回采巷道走向夹角较大(大于45°)的单一断层构造带,可在工作面回采巷道巷帮钻场内集中布置扇形预注浆钻孔;(3)对于煤层厚、落差大的断层构造带,可采用巷钻结合方式布置预注浆钻孔。工程实践表明:采用采煤工作面断层超前预注浆治理技术能够提高过断层期间顶板强度及稳定性,可有效避免顶板岩块超前抽冒,煤壁片帮及支架失稳等问题,有利于工作面快速通过断层构造带,为采煤工作面的安全生产提供了技术支撑。     

综放工作面过断层技术研究与实践

介绍了济宁二号矿复杂地质条件下综放工作面顺槽过断层时必须考虑的适合设备性能参数的巷道坡度、支护方式和防火处理,掘进和回采时对断层的处理方法和回采工作面制定过断层方案的步骤;工作面过断层措施在现场的落实与现场管理。     

8105综采工作面过断层综合技术研究

为保证8105工作面过断层期间的安全生产,提高资源回收率,对工作面巷道采取强化支护、优化采煤工艺、预裂孔松动等方式综合治理技术。过断层期间,2105巷、5105巷道顶底板变形量和两帮变形量能够满足安全生产要求,多回采煤炭约11万t。     

王庄矿3802工作面安全过断层综合技术研究

针对王庄矿3802工作面过断层期间可能存在的运输巷道变形、顶板垮落及煤壁片帮等问题，从安全回采技术角度，综合给出了工作面过断层期间巷道绞顶与挑顶施工工艺、挑顶爆破工艺、巷道支护及煤壁注浆加固技术，形成了工作面过断层安全回采方法，有效保障了王庄矿3802工作面安全高效回采，研究技术可为类似工程条件矿山提供工程借鉴。     

综采工作面超前掘巷过断层构造带技术

分析了庚组煤层断层构造的特点及存在问题,提出了综采工作面过断层方案:采用掘进超前巷道控制断层上盘顶板,利用网、绳控制断层下盘顶板,实现综采工作面快速抬溜、提架、过断层.在选取合理的顶板支护技术、优化综采工作面回采工艺的基础上,探索出工作面过断层的安全回采方法,为矿井综采工作面过大型断层提供了可供借鉴的技术经验.     

201综采工作面过断层群关键技术及实践

以某矿201综采工作面为背景,对综采工作面通过小断层群关键技术进行分析,重点对综采工作面通过老巷时“三机”在地质条件复杂情况下配合、矿压监测设置、补强支护等要素进行重点研究,提出过断层关键技术。经过现场工程实践,综采工作面得以安全顺利通过断层群。研究表明,合理的现场支护方案、回采方案、矿压监测方案是综采工作面通过断层群的重要保证,现场必须根据刮板、支架、采煤机配套关系及时调整回采方案,防止因现场采煤工艺不当造成设备不能正常运转。通过现场实践及技术分析,形成了“地质超前预测预报、补强支护先行、矿压监测实时预警、回采方案随时跟进”的过断层模式,能够为类似工程实践提供经验参考。     

以“避、让”为中心的综采工作面过断层方法的研究与实践

为了降低断层对回采工作面正常推采影响，确保产量、煤质各项指标、降低安全管理难度，基于厚煤层条带开采情况下工作面过断层群实践，提出以采煤工作面整体“避、让”为中心改造两巷避开岩石的过断层方式，根据断层空间形态，通过调整改造工作面两巷及采煤工作面位置，实现少割或不割岩石的目的。并通过理论计算论证了条带煤柱稳定性。该技术成功在古城煤矿2201工作面进行了应用，改造区回采期间推进速度正常、未引起自燃发火；多数区域均按常规进行放顶煤开采、多采出38.7万t煤；工作面未进行爆破作业、安全及生产管理难度小。有效解决了回采工作面过断层群时过断层周期长、放炮对设备影响大、煤炭回收率低不能兼顾等问题，成功实现了安全、经济、高效开采。     

上下相临工作面相对回采期间采动影响探索

通过对两个工作面同时相对回采期间的动压显现及相对回采时相互采动影响数据的现场收集、整理、统计、分析,掌握了两个相对工作面开采时随距离变化其动压和顶板移近量变化规律,结合现场实际情况,采取远距离供液、供电,加强顶板支护和巷道维护,保证巷道的通风、行人、行车的需要,保证了两个工作面回采期间的安全生产及矿井采煤工作面的正常接续和矿井产量的均衡稳定。     

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

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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.