ZTF8400-20/28B型放顶煤端头支架的应用

介绍ＺＴＦ８４００－２０／２８Ｂ型放顶煤端头支架的结构特点，技术的先进性及配套ＺＦＳ４００－１６／２４Ｂ型放顶煤支架装备配套使用所取得的技术经济效果，以及在华亭煤矿２１１０４工作面的应用情况。     

ZFS1800／16／24B—轻型放顶煤液压支架

介绍了ＺＦＳ１８００／１６／２４Ｂ轻放顶煤液压支架的技术参数、结构特点、试验情况以及应用效果。     

ZFS1800／16／24B轻型放顶煤液压支架

介绍了ＺＦＳ１８００／１６／２４Ｂ轻型放顶煤液压支架的技术参数、结构特点、试验情况以及应用效果。     

对低位放顶煤支架放煤工艺的分析

低位放顶煤液压支架,在我国使用时间较短,经验不足,放煤工艺存在开采厚度及采放比,放煤步距、放煤顺序也放煤口开启数目的问题,作者针对以上存在问题,结合ＺＦＢ２０００／１６／２４Ａ型轻型放顶煤液压支架进行分析,提出了建议。     

放顶煤支架改造及顶煤控制研究

通过ＺＦＳ３２００－１４／２６Ｃ型放顶煤液压支架的使用，结构受力分析，改造，分析了综放面顶煤控制的必要性和对顶煤控制性能的特殊要求。     

轻型放顶煤支架的改进及其在我局的应用

介绍ＺＦＳ１８００／１６／２４型轻型放顶煤支架改进前后试验情况、结构改进效果以及有待进一步研究解决的问题。     

放顶煤支架改造及顶煤控制研究

通过ＺＦＳ３２００－１４／２６Ｃ型放顶煤液压支架的使用、结构受力分析、改造，分析了综放面顶煤控制的必要性和对顶煤控制性能的特殊要求     

综放工作面矿压显现规律与支架适应性分析

以实测矿压数据为依据，得出了综放工作面矿压显现规律，分析了ＱＺＦＳ２４００／１６／２４Ｄ型放顶煤液压支架对兑镇煤矿９~＃、１０~＃、１１~＃合并煤层放顶煤开采的适应性，确定了综放工作面合理的工作阻力。     

ZFSB4400／16／28综采放顶煤支架的适应性分析

通过对姚桥煤矿７５０９综放工作面的实测，摸清了该综放面的矿压显现规律，分析了首次投入使用的ＺＦＳＢ４４００／１６／２８型反四连杆大插板放顶煤支架的特点及对该开采条件的适应性，并确定了合理的工作阻力。     

ZFS4400／17／32B型低位放顶煤液压支架在北京研制成功

ＺＦＳ４４００／１７／３２Ｂ型低位放顶煤液压支架在北京研制成功由北京煤矿机械厂研制成功的ＺＦＳ４４００／１７／３２Ｂ型低位放顶煤液压支架经过地面试验后，发往淮南矿务局。该型液压支架工作阻力４４００ｋＮ，动撑力４１５４ｋＮ，推移步距为６００ｍｍ，升起最...     

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。