煤矸石陶粒滤料制备及在生物滤池中应用研究

利用煤矸石作为主要原料,制备了生物滤池陶粒滤料。将滤料用于曝气生物滤池反应器,结果表明：煤矸石陶粒滤料挂膜快、易于反冲洗,对水中有机物和NH3-N的去除效果良好：在启动后的第6天,COD的除去率就达90.36%;第9天,NH3-N的去除率达到81.63%。反冲洗24h后,COD的去除率恢复正常;96h后,NH3-N去除率恢复正常。当停留时间为2h、气水比为2.5、pH值为8～9时,NH3-N的除去率最高;当停留时间为2.5h、气水比为2.5时,COD的除去率最高。     

焙烧温度对硅藻土陶粒孔隙特征的影响

利用天然粘土和硅藻土作为主要原料,制备曝气生物滤池陶粒滤料。研究了焙烧温度对滤料孔径分布、比表面积、显气孔率等性质的影响。SEM形貌分析、压汞法孔径分析及其它的测试结果表明,当焙烧温度在950~1 050 ℃,可以制备出表面粗糙、物理化学稳定性良好的生物滤池陶粒滤料,滤料的比表面积7.76~5.49 m²/g,孔径范围0.003~10 μm,显气孔率73.88%~71.44%,容重0.77~0.84 cm³/g,有关性能指标优于进口陶粒滤料。     

沸石吸附7-ACA废水中CODCr和NH3-N的试验研究

以抗生素原料中间体( 7-ACA)废水为研究对象,天然沸石及改性沸石为吸附材料,考察了废水初始pH值、沸石粒径、沸石投加量、吸附时间及沸石酸、碱、盐改性对废水中CODCr和NH3-N去除效果的影响.单因素实验结果表明,天然沸石处理废水的适宜条件为:废水初始pH值7.5,沸石投加量20g/L,沸石粒径1～2 mm,吸附时间150min.此条件下天然沸石对废水中CODCr和NH3-N去除率分别为35.3％和23.0％.盐酸改性沸石对废水中CODCr和NH3-N去除效果明显优于氢氧化钠改性沸石和氯化钠改性沸石.1 mol/L盐酸改性沸石投加量为15g/L,对废水中CODCr和NH3-N去除率均大于改性前,分别为48.4％和40％.     

底泥陶粒曝气生物滤池处理生活污水的试验研究

为探究底泥陶粒滤料和市售陶粒滤料对曝气生物滤池( BAF)效能的影响,构建了底泥陶粒曝气生物滤 池(SSC-BAF)和市售陶粒曝气生物滤池(CTC-BAF)对比试验体系,考察了 BAF 启动挂膜、不同水力停留时间对生活 污水中 COD、NH3-N、TP 去除效果的影响。 结果表明,底泥陶粒表面粗糙,孔隙性较好,比表面积较大,生物附着性较 强,适于作微生物的载体。 微生物在底泥陶粒滤料上挂膜成功仅需 12 d,且 SSC-BAF 对 COD、NH3-N、TP 的去除率比 CTC-BAF 分别提高了 9. 19、7. 55、11. 42 个百分点。 水力停留时间对 BAF 系统去除 COD、TP 有较大影响,对 NH3-N 的 去除影响较小。 当水力停留时间为 22 h 时,SSC-BAF 对 COD、NH3-N、TP 的去除效果均优于 CTC-BAF,平均去除率分 别为 77. 24%、71. 21%、73. 92%。 以河道底泥为原料制备的陶粒可用作 BAF 滤料,底泥陶粒滤料对 BAF 效能的提升 更显著。     

凹凸棒曝气生物滤池挂膜启动特性研究

利用凹凸棒复合滤料为填料,研究曝气生物滤池对微污染水源水预处理的挂膜启动特性.研究结果表明:凹凸棒曝气生物滤池25天左右挂膜成功,CODMn和NH3-N去除率分别可达30%和65%,NH3-N的去除率可以作为曝气生物滤池挂膜成功的标志;能谱分析结果显示滤料表面碳含量为12.1%,8.86%来源于滤抖吸附的有机物,3.24%来源于滤科表面附着的微生物,能谱分析法是一种评价生物量的有效辅助工具.     

曝气生物滤池陶粒滤料制备及其性能

利用天然黏土（凹土、膨润土等）和粉煤灰作为主要原料，制备曝气生物滤池陶粒滤料。研究了焙烧温度对滤料孔径分布、比表面积、显气孔率等性质的影响。测试结果表明：当焙烧温度在950-1050℃时，滤料的比表面积为4．26-7．24m^2／g，孔径范围0．003-10μm，显气孔率为72．29％-73．21％，容重O．73-0．74cm^2/g，表面粗糙，物理化学稳定性良好。     

一种新型滤料的研制及其在曝气生物滤池的应用

为促进滤料的开发和曝气生物滤池的发展,研究了SVA滤料的制作方法以及该滤料应用于曝气生物滤池试验的处理效果。结果表明:以一种轻质多孔矿物粒料为芯材,两种轻质矿物粉料经混合作为基材,加入粘结剂造球,制成3~6mm球形颗粒滤料用于曝气生物滤池处理城市污水,在气水比3∶1,水力负荷2.12m3/(m2.h)条件下,CODC r、BOD5、NH3-N去除率分别达到83.3%、82.4%、77.3%,说明该滤料具有良好的污水处理效果。     

低硅铁尾矿多孔陶粒的制备及污水处理效果

以某低硅铁尾矿为主要原料制备出了尾矿添加量达77%的多孔陶粒,并通过试验室曝气生物滤柱考察了所制备陶粒对模拟生活污水的处理效果。结果表明：该陶粒表面粗糙,内部多孔,表观密度、显气孔率和平均孔径分别为1.33 g/cm³、54%和19.80 μm,重金属浸出试验浸出液中的重金属浓度符合国家地表水环境质量标准。以该陶粒为滤料的曝气生物滤柱对模拟污水的处理效果良好,COD_Cr、NH+₄-N、TN的去除率分别为84.26%、84.01%和25.87%;滤柱内陶粒上附着的微生物种类丰富,进水端单位质量陶粒上的生物脂磷总量可达371.63 nmol/g,陶粒表面和内部分别占90.79%和9.21%。     

煤矸石陶粒滤料的制备及性能研究

以煤矸石为原料,分别采用破碎法和成球法制成滤料生料,经快升温或慢升温焙烧获得陶粒滤料.对所制备陶粒滤料的气孔率、气孔孔径和酸碱可溶率等指标进行了分析比较.结果表明:各种陶粒滤料制品均性能优良;制品的气孔率都随着焙烧温度的升高由小变大,又逐渐降低,成球法制品的气孔率普遍要高于破碎法;快烧制品的气孔孔径分布范围较窄,慢烧制品的气孔孔径分布范围则很宽,2种焙烧方式所得制品中孔径大于100μm的气孔都随着焙烧温度的升高而增加;制品的酸碱可溶率均随焙烧温度的升高而降低.实际生产时,可根据煤矸石特性、产品的性能要求、生产成本等确定煤矸石陶粒滤料的制备工艺.     

涂铁改性火山岩去除矿井水中铁锰离子试验

利用涂铁改性火山岩滤料对矿井水进行了除铁除锰的试验研究.结果表明,改性火山岩滤料对铁锰离子的吸附都遵循Freundlich等温吸附模型.动态对比试验中,改性火山岩对矿井水中铁离子的去除率达80%～99%,与锰砂效果接近,但略低于火山岩;对锰离子的去除,改性火山岩效果最佳,在过滤前6 h,锰去除率接近100%,6 h后锰去除率随过滤时间呈线性降低.结合扫描电镜和能谱,分析了滤料的表面形貌和化学组成,并对改性火山岩滤料除铁除锰机理进行了分析.     

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。