某铅锌矿全尾砂充填料浆输送性能试验研究

充填料浆沿管道的输送阻力i与充填料浆自身的屈服剪切应力τ0、粘性系数η、充填料浆输送流速V及输送管道直径D有关。通过对某铅锌矿选厂全尾砂粒径、物理化学参数、沉降性能及塌落度等特性研究,选择不同浓度的选厂全尾砂进行充填料浆流动性试验。根据流动性试验结果,求得不同浓度全尾砂充填料浆流变参数,计算出全尾砂在不同浓度、不同流量及管径条件下,充填料浆管道流动阻力,从而得出可实现管道顺利输送的充填倍线。试验研究表明,决定输送阻力的两个关键因素分别为充填料浆浓度和输送管道内径,某铅锌矿选厂全尾砂充填料浆浓度为72%～74%、充填管径为150mm时,其输送性能最佳。     

某矿山高浓度胶结充填材料试验研究

针对某金属矿山将原废石充填采矿法改为全尾砂胶结充填采矿法的现状,对其选厂全尾砂开展了基本物理化学参数、粒度分析、塌落度等试验研究,进行了不同质量浓度的全尾砂充填料浆的 L 管流动性试验.根据试验结果,计算出全尾砂充填料浆在不同质量浓度、不同流量及不同管道直径条件下的管道输送阻力,分析得出管道输送阻力的关键影响因素,并确定可实现充填料浆管道自流输送的充填倍线.结果表明:充填料浆质量浓度为７０％~７６％时,塌落度均在２８cm 以上,流动性较好;管道输送阻力的关键影响因素为充填料浆质量浓度和管道直径,充填料浆质量浓度越大,管道直径越小,管道输送阻力越大;当全尾砂充填料浆质量浓度为７０％~７６％,输送管道直径为１５０mm,充填流量为８０m３/h时,其流动性及输送性能最佳,可以实现顺利自流输送的充填倍线为６．７１~１１．１３.试验结果可为该金属矿山全尾砂胶结充填系统建设提供技术支撑     

武里蒂卡金矿膏体充填料输送性能试验研究

膏体充填以其高浓度、无脱水、低水泥耗量等优势而广受国内外地下矿山的推崇,但同时也存在膏体输送管道阻力大、管道易堵塞的问题,为给矿山膏体输送系统提供设计依据,开展膏体充填料浆输送性能试验研究就显得十分必要。哥伦比亚武里蒂卡金矿拟采用全尾砂膏体充填,全尾砂膏体充填需求量60 m3/h～100 m3/h。本文通过坍落度试验研究分析充填料浆和易性并初步确定膏体态充填料浆的浓度范围,约为68%~70%。以此为基础,利用流变仪测试充填料浆的屈服剪切应力与黏性系数,计算得出管道单位长度充填料浆流动阻力,并结合矿山膏体输送条件,确定了武里蒂卡金矿的膏体输送参数。研究表明,充填料浆浓度宜选定66%~68%,推荐井下充填管道内径150 mm,相应膏体输送阻力2.69~5.74 kPa/m,采用10 MPa膏体输送泵可将充填料浆水平输送1.7~3.7 km,能够很好地满足矿山充填系统膏体输送的需求。膏体充填料浆输送性能参数及其确定方法可为类似地下矿山充填系统建设提供参考与借鉴。     

全尾砂高浓度充填料浆自流输送系统特性分析及设计

本文参照矿山实例,应用试验室测定的不同浓度及配比的全尾砂料浆的塌落度及管道输送料浆流速和流变参数,对全尾砂高浓度输送系统的各种特性参数进行了分析计算,确定了深井矿山充填系统的输送浓度、流速、输送管径和可实现顺利输送时的充填倍线等参数,为类似矿山充填自流输送系统设计提供参考。     

粗骨料膏体充填料浆流变特性与管道输送阻力计算

通过粗骨料膏体充填料浆流动性及泌水率试验,测试了粗骨料膏体流动性及泌水率,确定了粗骨料膏体可实现管道输送的质量浓度范围,并理论分析建立了基于流变参数计算粗骨料膏体料浆管道输送阻力数学模型;同时,在可实现管道输送粗骨料膏体料浆质量浓度范围内,采用美国Brookfield公司的RST-SST型软固体流变仪测试了不同浓度、灰砂比条件下的粗骨料膏体料浆流变参数;结合管道输送阻力数学计算模型,计算不同浓度、灰砂比、管径及流量条件下的粗骨料膏体料浆管道输送阻力;最终根据计算结果及矿山生产情况,选取了最佳的粗骨料膏体料浆管道输送参数,为粗骨料膏体充填料浆管道安全、可靠输送提供了支撑。     

凡口铅锌矿高浓度尾砂充填材料特性试验研究

针对凡口铅锌矿目前充填浓度低,生产成本高,尾砂利用率不足等问题,研究了不同充填材料的配比参数,分析了不同条件下料浆流动性变化规律和管道输送阻力特性。结果表明,为满足采场机械化开采需要,采场浇面充填宜选择分级尾砂作为骨料,灰砂比为1∶4,质量分数为76%,充填体强度R3≥3.0 MPa;非浇面充填可选择混合尾砂作为骨料,灰砂比为1∶4,质量分数为70%,充填体强度R28≥3.0 MPa。充填料浆采用内径130 mm管道输送,流量为60 m~3/h时,分级尾砂料浆和混合尾砂料浆管道输送阻力分别为1.77 MPa/km和1.97 MPa/km。基于矿山现有充填管网系统及管道参数,采用高质量分数充填时,管网系统充填倍线均小于料浆自流充填倍线,均可实现自流输送。     

极细全尾砂胶结充填参数优化的试验研究

针对极细全尾砂胶结充填的充填体强度低、胶凝材料消耗量大等问题,以某矿山为实例,通过细粒全尾砂性能评价、自然沉降试验、塌落度试验、配比强度试验和自流输送试验及计算和分析,获得了最佳的充填技术参数。试验结果表明:全尾砂浆沉降24h后其最大浓度为73.4%,仅靠自然沉降无法满足矿山连续充填作业的要求。当全尾砂浓度为78%以上时,难于实现自流输送。为全尾砂浆浓度为74%～76%、料浆流量为150m~3/h、管道内径为150mm时,管内料浆流速为2.36m/s,管道输送阻力为2.1kPa/m～4.4kPa/m,可实现自流输送的充填倍线为4～11。当全尾砂浆浓度为76%、灰砂比1∶4～1∶8时,充填试块60d的强度为1.78MPa～3.62MPa,可满足矿山采空区充填的强度要求。     

大流量全尾砂膏体料浆管道输送参数计算与分析

在全尾砂膏体料浆管道输送技术中,合理输送管道参数的确定是确保其安全、可靠输送的核心。本 项目以某大型铜矿山为研究对象,设计采用全尾砂膏体料浆管道输送;针对其输送流量大、管道输送阻力大等技术 难题,以尾矿基础参数测试结果为基础,开展了全尾砂膏体料浆高效浓缩试验及料浆流变试验,根据试验结果推荐 输送浓度为 60%~65%;同时按照刘德忠公式及管道复合流态摩阻损失数学计算模型,计算分析了全尾砂膏体料浆 管道输送临界流速与摩阻损失等关键工艺技术参数;最终根据矿山生产参数,确定了管道输送方案及参数,即在日 生产尾矿量为 58 000 （t 干量）条件下,推荐全尾砂膏体料浆输送最佳浓度为 60%~65%,推荐采用单条管线输送,输 送工作流速为 1.85~2.12 m/s,对应输送管径为 650 mm。     

管道输送高浓度全尾砂充填料浆的阻力损失研究

以地下矿山超大规模充填开采的发展趋势为背景,采用Fluent-3D工程流体力学软件,构建充填倍线为3,5,7的三维自流输送模型,通过数值模拟实验,研究浓度为70%、72%、74%的全尾砂充填料浆在直径为100~200 mm管道中输送时的阻力损失规律。结果表明,高浓度全尾砂充填料浆管道输送阻力损失与管径呈指数函数减小的变化关系,当管道直径小于150 mm时,阻力损失随管径的变化率较大,管道直径大于150 mm时,阻力损失随管径的变化率明显减小;随着水平管道长度的增大,阻力损失线性增大,而充填倍线对高浓度全尾砂充填料浆水力坡度的变化率几乎没有影响;阻力损失随料浆浓度的升高而增大,料浆浓度越高,阻力损失随管径的变化率越大;增大管径可降低浓度对输送阻力损失的影响,大直径管道输送高浓度全尾砂料浆具有良好的可行性。     

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。     

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。