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。     

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。     

高硫极细全尾砂充填料配比及输送特性试验研究

针对某铅锌矿全尾砂具有含硫高、粒度极细的特点,在实验室进行了全尾砂充填料配比试验和输送特性测试。充填料配比试验研究表明,全尾砂充填体早期强度逐渐增加,后期强度呈现逐渐降低趋势,并且灰砂比越小,抗压强度降低越明显;灰砂比1:4、质量浓度72%的全尾砂胶结充填料能满足采矿工艺要求,但水泥单耗比较高。坍落度和流变特性测试表明充填料浆质量浓度在70%~72%时表现出明显的膏体特征。试验研究结论为矿山充填系统建设提供了重要依据。     

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     

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.     

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     

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     

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.     

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     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

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