新增主扇在多主扇联合运转矿井通风系统的稳定性研究

为保证矿井风量充足,马脊梁矿西三风井主扇将投入运行,届时将对全矿井通风系统进行调整,在新主扇运行及全矿井通风系统调整期间,采取了一系列的调风、调阻及调压措施,使各主扇运行工况及井下各用风点风量处在合理范围内,确保了各主扇和全矿井通风系统的稳定运行。     

新郑煤电矿井通风阻力测定分析与应用

为了解新郑煤电矿井通风系统存在的问题,根据井下风量分配情况规划了4条测定路线,并合理选取了测风点与测压点进行通风阻力测定。分析新郑煤电通风阻力测定数据及结果表明:对于新郑煤电矿井通风系统,采用气压计基点法测试结果较为准确,西风井、北风井及矿井等积孔均大于2 m2,属通风容易矿井;西翼通风阻力集中在用风区,主要是14采区运输上山和回风上山2条通风线路均有调节设施,增加了通风阻力;北风井通风系统回风巷风量较为集中,风速较大,回风区阻力较大。针对2风井通风系统存在的问题分别提出了优化建议。     

高瓦斯矿井多风井系统新风井并网方案优选及实践

潞安集团所属的多风井通风系统的矿井,风井的分区多为回风系统完全分隔、进风系统不完全分隔,如果对采区及以上通风系统进行调整考虑不周全,就有可能在调整过程中造成风量分配不合理、主扇运行不在合理工况区、部分巷道无风微风等隐患。文章通过对高河煤矿鲍村新风井投运方案的优选,保证了新风井的顺利投运,保障了矿井通风系统运行的稳定、可靠。     

多风机并联通风系统分析及通风难易程度探讨

采用多台通风机分区并联通风,可以合理增加矿井的需风量。矿井等积孔是评价矿井通风易难程度的一项重要指标,但并不能准确、全面地反映其真实易难、好坏程度,尤其是在多风井多风机并联通风当中,全面进行矿井通风可靠性评价,要考虑主要通风机的运行工况、供风量、矿井瓦斯涌出量、采煤方法和开采强度等因素,以保证通风系统的合理、稳定、可靠。文章分析了多风机分区通风并联运转的相互影响以及多风井多风机通风方式通风难易程度的评估。     

矿井多区域均衡通风优化方法及应用

针对兖矿集团兴隆庄煤矿通风系统复杂,东、西风井主通风机能力不足,局部巷道通风阻力大,采掘地点供风困难等问题,制定了矿井多区域通风系统优化方案。通过更换东风井主通风机、改造东风井风硐、维修西风井主通风机、巷道降阻工程等措施,使矿井总进风量由10 386 m3/min增大到14 413 m3/min,总阻力由1 823.9 Pa降低为1 417 Pa,有效改善了矿井通风状况,保障了矿井安全生产。     

某大型露转井矿山通风系统现状分析与优化

某大型露转井矿山通风系统实际风量远低于设计风量,并且崩落法开采塌陷区处漏风量达到90.69 m3/s,占全矿总风量的25.33%。为解决矿井通风系统存在的诸多问题,利用多级机站技术对全矿通风系统进行合理分析和优化,增设西5回风井作为西采区回风路,将2#回风井地表2台风机更换为250 kW风机,在增加西采区回风量的同时加大矿井总风量;并对全矿范围内的塌陷区漏风点进行全面排查,利用通风构筑物封闭0 m水平管缆井、回采巷道和副井石门等多处漏风点,解决塌陷区漏风问题,有效提高矿井有效风量率。通过落实优化措施,矿井总风量提高至513.64 m3/s,矿井漏风率降低至5%以下的合理范围,有效提高了矿井通风能耗的综合利用率。     

矿井通风难易程度评价指标的探讨

为了科学准确地评价现代矿井的通风难易程度,研究了目前矿井通风难易程度评价中存在的2个主要问题:等积孔分级方法失效和如何准确评价多风井矿井的通风难易程度。分析得出等积孔现有分级方法失效是由于现代矿井的长距离大风量的通风要求而矿井通风阻力增幅有限所致,在此基础上提出了一种依据矿井总回风量和风井数的等积孔新分级方法,新评价方法中对多风井矿井各风井通风系统的通风难易程度分别评价。新的评价方法在新庄孜煤矿验证能够准确反映该矿通风难易程度,较好的克服了现有评价方法的缺点。     

矿井通风难易程度的探讨

提出矿井等积孔虽然是评定矿井通风难易程度的重要指标,但不是唯一指标的观点;并指出,确定矿井通风难易程度,应从矿井等积孔、矿井风量大小、漏风量大小以及矿井各采区调风的难易程度等多方面进行综合考虑。此外,还对采区调风困难的原因及解决矿井通风困难的途径进行了探讨。     

多中段通风综合分区集中控制技术在罗河铁矿的应用

罗河铁矿采用多中段回采方式,中段布置在-455～-782 m,分布范围广且较分散。原通风系统的矿井总风量为363. 71 m~3/s,存在总风量严重不足、多中段风流紊乱、风机布置不完善、中段风量分配不合理等问题。为解决矿井通风问题,重新核算通风系统总风量,根据各中段需风量综合分析,合理划分需风区,集中控制,利用三维动态模拟、风机风压平衡、多风机联合运行、风机变频调节等技术,合理分配各中段需风量。现场实施后,总风量提高至459. 10 m~3/s,各采区风量能够满足实际需风量要求,风机联合运行性能得到有效提升,保证了多中段通风系统运行的稳定性和可靠性。     

深部边远采区可控循环通风技术研究及应用

针对井亭煤矿单纯依靠提高矿井主通风机转速、降低矿井通风阻力、设置井下辅助通风机不足以解决矿井边远采区66采区供风量不足的实际问题,在对矿井采取可控循环风的必要性分析的基础上,对矿井边远采区可控循环通风技术方案进行设计,确定了最优方案,并对应用效果和经济效益进行了评价。结果表明:采取可控循环风能够显著升高矿井边远采区66采区的供风量,同时改善作业地点气候和环境条件,显著节约电耗,解决了该矿井边远采区供风不足的问题。     

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。