综放工作面沿断层预掘巷道掏矸助采技术的研究应用

为了解决综放工作面平稳过落差大于煤层厚度的断层,通过对工作面过断层方法进行分析研究后,提出了沿断层预掘巷道掏矸助采技术。通过在对掏矸助采巷道及工作面回采过程中采取一系列技术措施,使得综放工作面平稳采过落差大于煤层厚度的断层,取得了较好的效果。     

大倾角综放工作面液压支架防倒防滑技术

通过对大倾角综放工作面液压支架进行受力分析,揭示了支架在大倾角工作面上的受力特征和稳定性状况,研究了大倾角综放工作面液压支架防倒防滑装置,以及提高支架稳定性和支护可靠性的措施,拓宽了综放支架的适用范围。     

ZF7000放顶煤支架用于大倾角工作面的技术改造

通过对大倾角综放工作面的受力特征和稳定性状况研究,枣庄矿业集团第二机械厂利用现有放顶煤支架进行技术改造,研制了ZF7000/23/47型大倾角放顶煤液压支架防倒防滑装置,提高了支架稳定性和支护可靠性,实现综放工作面高产高效。     

大断面巷道机械化掘进过断层群技术

为确保大断面巷道安全快速通过落差超过17m的大断层群,满足矿井正常生产接续要求,大柳塔煤矿针对施工难点,根据断层预测情况确定巷道爬坡位置,采用连采与综掘分巷同掘的施工工艺,同时采取锚网索联合快速支护方法,实现了25.2m2大断面巷道机械化掘进过大断层群(最大落差为17.9m)技术,为大断面巷道机械化掘进过大断层提供了施工经验。     

大采高综采工作面回撤通道临断层围岩控制技术研究

针对付村煤矿大采高综采工作面停采线临断层无预掘回撤通道时液压支架回撤周期长、安全性差等问题，提出了临断层预掘单一回撤通道的方案。通过数值模拟研究了工作面开采扰动前后回撤通道距离断层1m、3m、5m三种情况的围岩变形量及应力变化情况，综合考虑巷道围岩稳定性与资源回收率两方面因素，确定了回撤通道距离断层3m的布置方案。同时提出了回撤通道锚网梯(索)的支护方案，通过进行现场巷道围岩量变形观测，表明支护方案可行，能够满足支架回撤的要求。     

综放工作面过补切眼和掏槽巷的矿压显现规律研究

综放工作面过落差大于一个煤层厚度的断层时,采用在补切眼内沿断层预掘掏槽巷的巷道布置方法。通过对补切眼和掏槽巷现场观测,总结巷道收敛变形规律,为采取有效的维护方式提供参考和依据。     

大倾角综放开采液压支架稳定性分析与控制措施

从静力学角度对大倾角条件下综放开采液压支架抗倾覆、滑移、扭斜稳定进行了分析,结合王家山煤矿的大倾角(29～43°)工作面的煤层条件和生产实践,对大倾角综放开采液压支架的3种稳定性进行了研究,分析煤层倾角、顶板压力、支架几何参数、支架工作状态对支架稳定的影响,在此基础上介绍了保证大倾角综放液压支架稳定的途径和王家山煤矿的生产经验.     

综放工作面过断层预掘巷道掏矸助采技术的实践应用

高庄煤业公司在西五采区3上1101综放工作面过大断层的实践中,工程技术人员对工作面揭露断层特征、过断层方法和技术措施进行深入的分析和研究,提出了综放工作面过断层预掘巷道掏矸助采的新方法。通过实践应用获得成功,并取得了很好的经济效益。     

综放工作面缩面过程中上端头支护方法研究

239综放工作面掘进期间为躲避落差较大的断层及保证资源回收,摒弃了传统的四边形工作面,采取了多边形工作面布置,回采过程中逐架减撤支架。本文通过对综放工作面减撤支架过程中上端头支护技术的研究,为综采(放)类似工作面的端头支护提供了经验。     

大倾角综放工作面液压支架稳定性技术探讨

针对大倾角综放工作面的条件,对大倾角液压支架稳定性关键技术进行了深入研究,提出了对整个支护系统及相关设备的稳定性控制的技术措施。     

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     

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 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     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered