废石-全尾砂高浓度充填料浆管输阻力影响因素分析

在废石-全尾砂高浓度充填料浆泵压管输方面,由于粗粒级废石骨料的加入,料浆的流变特性和输送特性均发生很大变化,因此其管输阻力也发生较大变化。文中对环管试验所测得的管输阻力数据进行了分析,在一定范围内表明了流速、质量浓度、废石尾砂比等因素对管输阻力的影响。     

鞍钢矿山全尾砂充填料浆输送特性L管试验研究

为了揭示鞍钢矿山全尾砂充填料浆的管道输送特性,基于流体力学中Bingham流体模型,结合鞍钢矿山充填系统,开展了L管充填料浆自流输送试验研究。通过胶砂比分别为1:6、1:8、1:10及质量浓度分别为66%、68%、70%、72%条件下的充填料浆管输特性的L管试验,分析了不同工况条件下的管道输送摩阻力试验数据。结果表明:料浆质量浓度比胶砂比对其屈服应力、黏率系数以及管输阻力影响显著;当料浆浓度达到70%和胶凝材料添加量为11%,管输阻力损失为7.02 k Pa/m,料浆自流输送的最大充填倍线为3.29。试验结果对鞍钢矿山的充填系统设计具有指导意义。     

基于环管试验的高浓度料浆输送性研究

通过环管试验对高浓度全尾砂充填料浆管道输送过程进行模拟,研究了对全尾砂高浓度料浆的输送性能。通过对不同浓度料浆的流动性、泌水性、沉缩性进行研究,界定高浓度料浆的浓度范围,从而确定试验对象。基于环管试验直接测取的阻力损失参数,进行理论分析和数据处理,获得料浆的流变参数,结合拟合分析和流体力学基本理论推导出经验公式,用于阻力损失参数的预测,拓宽了环管试验的应用范围。     

煤矿高浓度胶结充填料浆流变特性试验研究

煤矿高浓度胶结充填材料由煤矸石、粉煤灰、水泥等材料混合而成,为得到充填料浆的流变特性,采用旋转流变仪,通过试验得到充填料浆的剪切速率-剪切应力流变曲线图,经回归分析确定了料浆的屈服应力和粘度系数,确定了流变模型和流变方程。分析了流变参数随时间的变化规律,得到了管道输送阻力损失算式,单位长度的管道输送阻力损失是管道内径、料浆输送剪切速率和时间的函数,分析结果可以为充填系统的设计提供技术参数和依据。     

基于环管试验确定粗骨料膏体充填料浆管道输送参数

以粗骨料膏体充填料浆管道输送为研究背景,基于环管试验测试了不同质量浓度、不同灰砂比、不同充填流量、不同管径条件下的粗骨料膏体管道输送阻力;分析了影响粗骨料膏体充填料浆管道输送阻力的影响因素;最终依据矿山实际生产现状,结合环管试验结果,确定最佳的粗骨料膏体充填参数为:输送能力90m3/h、膏体充填料浆质量浓度80%、灰砂比1∶10~1∶6、输送管径Φ165×12、输送流速1.6m/s。从而为矿山粗骨料膏体充填系统设计及管道输送系统设计提供可靠的数据支撑。     

全尾砂充填料浆管道输送试验研究

充填矿山为获最佳输送参数往往需环管输送试验,但该类试验需要较多的测试装置和试验物料,且时间长、费用高。针对这些缺陷,在某铁矿充填料浆管道输送试验研究中提出了一种简单实用型管道输送试验方法。试验表明:该法结合坍落度、简易流动性辅助试验能够直观掌握充填料浆流动特性,通过对影响管道阻力损失的各种因素进行分析,可以确定矿山最佳输送参数。     

考虑温度影响的充填料浆水平管流特性研究

为探究不同温度下充填料浆水平管流特性,开展了流变实验以获取不同温度下充填料浆流变参数,基于流体力学理论提出了充填料浆管道输送基本假设,利用COMSOL软件建立水平管道模型,分析了温度对料浆流态、流速、管道压力及管输阻力的影响.结果表明,温度升高,充填料浆塑性黏度和屈服应力降低;料浆在管道输送过程中壁面附近呈剪切流动,中...     

湿喷混凝土的管道输送研究

目前针对湿喷混凝土管道输送规律的研究较少,现有的研究多数是建立在对建筑用混凝土和高浓度充填浆体理论研究的基础上。但湿喷混凝土与建筑用混凝土和高浓度充填浆体,无论在材料组成还是输送动力上都存在很大差异。为此,结合矿山湿喷现场管道布置特征及环管试验设计原则开展了湿喷混凝土的环管实验,探究湿喷混凝土管道输送的阻力影响因素及规律。结果表明,管道输送阻力与直管管道半径、弯管曲率半径及料浆坍落度有密切关系。为提高湿喷混凝土的可泵性,可从改善管网参数和提高料浆的工作性两方面采取措施,并揭示了湿喷混凝土管道堵塞机理。     

高浓度分级尾砂充填料浆管输阻力影响因素研究与分析

为了研究高浓度分级尾砂充填料浆管输沿程阻力,先测定分级尾砂的物理化学性质;通过工业管输试验,测出不同浓度、流量、灰砂比条件下的充填料浆的管输沿程阻力,以水平管和斜管的管输沿程阻力为例,分析了充填管道阻力与流量、浓度、灰砂比之间的变化规律;用多因素正交试验得出管输阻力影响因素间的主次关系,得出井下不同充填条件下的最优参数,试验方法及结果对矿山实际充填生产具有较好的指导意义。     

煤矿高浓度胶结充填料浆管道输送阻力试验研究

为研究煤矿高浓度胶结充填材料在管道输送过程中的阻力损失特性,进行了不同浓度和不同粉煤灰含量条件下充填料浆的环管试验,得到了高浓度胶结充填料浆管道输送过程中的沿程阻力损失值和局部阻力损失值。研究结果表明,高浓度胶结充填料浆管道输送阻力损失值随料浆浓度的增加而增加,随粉煤灰含量的增加而增加,料浆浓度增加0.5%,沿程阻力损失会增加6.17%~21.08%,局部阻力损失增加7.48%~12.24%;粉煤灰含量增加2%,沿程阻力损失会增加6.5%~15.24%,局部阻力损失增加2.16%~5.42%。     

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。