硅藻土/碳酸钙复合吸附材料制备研究

本实验用生石灰和碳酸铵与硅藻土混合进行水热改性,合成具有一定力学性能且吸附性能良好的硅藻土陶粒。研究了制备过程中生石灰添加量、碳酸铵添加量、水热反应温度、焙烧时间及焙烧温度对陶粒强度及吸附性能的影响。结果表明:当硅藻土中生石灰的添加量为15%、碳酸铵添加量为15%,180℃水热反应6 h,并在125℃下焙烧40 min时,陶粒性能最佳,其散失率仅为4.41%,对阳离子红的吸附去除率可达到49.42%,饱和吸附量为247.1 mg/g。X射线衍射(XRD)与红外光谱(FTIR)分析表明:向硅藻土中加入生石灰和碳酸铵后,硅藻土陶粒中生成了碳酸钙物相。     

硅藻土复合纤维改性沥青微观机理研究

以不同掺量的硅藻土复合纤维制备改性沥青,通过红外光谱和差示扫描量热法对基质沥青及改性沥青的微观结构进行分析,研究其改性机理。研究结果表明,改性剂与基质沥青没有发生化学反应,改性剂在沥青中均匀分散,选择性的吸附沥青中的组分,使沥青的胶体结构重新调整,沥青中部分组分的存在形式及数量发生变化,这些变化使沥青的微观结构改变,导致改性沥青的聚集态发生转变的组分数量减小,温度稳定性明显提高。硅藻土复合纤维改性沥青的过程是一个沥青自身微观结构改善的物理镶嵌共混过程。     

硅藻土复合纤维改性沥青微观机理研究

以不同掺量的硅藻土复合纤维制备改性沥青,通过红外光谱和差示扫描量热法对基质沥青及改性沥青的微观结构进行分析,研究其改性机理。研究结果表明,改性剂与基质沥青没有发生化学反应,改性剂在沥青中均匀分散,选择性的吸附沥青中的组分,使沥青的胶体结构重新调整,沥青中部分组分的存在形式及数量发生变化,这些变化使沥青的微观结构改变,导致改性沥青的聚集态发生转变的组分数量减小,温度稳定性明显提高。硅藻土复合纤维改性沥青的过程是一个沥青自身微观结构改善的物理镶嵌共混过程。     

硅藻土助滤剂的制备与性能研究

本文采用干湿法制备了一系列硅藻土助滤剂，考察了煅烧温度、燃烧时间及助熔剂加入量对其性能的影响。研究表明：高温及长时间煅烧有助于助滤剂粒子的长大，选择合适的温度、时间及助熔剂加入量，可制得具有较好骨架强度及粒度分布的助滤剂。     

喷射纤维混凝土在深井巷道支护中的应用

煤矿深井巷道的支护一直是世界采矿界的难题.介绍了聚丙烯(粗)纤维复合水泥基材料的制备技术.通过对纤维掺量、喷层厚度和纤维搅拌工艺等关键参数、工艺的试验研究,得出了最适聚丙烯(粗)纤维掺量为0.8％(体积比).经过模拟优化确定纤维混凝土喷层厚度为120mm.结合工程实例分析了支护效果,为这种支护材料推广与应用提供理论根据.     

改性硅藻土填料在造纸中的应用研究

采用改性硅藻土和原硅藻土为造纸填料,研究在填料加填量不同的条件下,硅藻土改性前后使用性能的变化,对纸张灰分和纸料滤水性的影响,以及对纸张抗张指数、撕裂指数、白度、耐折度和耐破度的影响。结果表明,在同一加入量的条件下,加入改性硅藻土纸张的抗张指数、撕裂指数、耐折度和耐破度均比加入未改性硅藻土纸张有所提高和改善,纸张白度略有降低,当填料加入量为25%时,纸张灰分提高4.3%。     

硅藻土基调湿材料的制备与性能研究

以吉林临江硅藻土作为原料,通过提纯、无机盐修饰改性工艺制备硅藻土基调湿材料.探讨了硅藻土调湿机理,研究了提纯、修饰改性对硅藻土吸湿性能的影响,采用BET、SEM、EDS、TEM测试方法对样品进行了分析表征.结果表明,硅藻土孔结构的惯通性是其具有良好调湿性的重要因素,经过提纯、无机盐修饰的硅藻土,吸湿率可达98%.     

利用煤矸石制取无机纤维工艺试验的研究

用矿热电炉处理煤矸石,并对制取矿物无机纤维的工艺技术条件进行了研究,发现通过加入辅助添加剂,用煤矸石可制取无机纤维.试验结果表明:在石灰添加量为20%、铁精粉添加量为25%,以及石灰石添加量为20%、镍红土矿添加量为100%的条件下,电炉冶炼均能正常进行且能制备出无机纤维,所制备的无机纤维经处理后可获得合格的纤维保温板.     

磷石膏-硅藻土高温高压试验及孔隙结构研究

通过添加不同比例的硅藻土粉,在200℃高温、200MPa高压条件下烧结制备硅藻土-磷石膏复合材料.采用X射线衍射(XRD)仪、扫描电子显微镜(SEM)、颗粒(孔隙)及裂隙图像识别与分析系统(PCAS)软件等,研究硅藻土掺量对磷石膏体系物相、显微组织形貌、孔隙结构的影响.结果表明,不同磷石膏体系在高温高压条件下,矿物种类...     

硅酸钙板质废弃物处理含铅污水及土壤试验

硅酸钙板固体废弃物中通常含有托贝莫来石,在污水处理和土壤改良剂制备方面具有潜在应用价值。 分别以抛光粉和废弃硅酸钙板为原料制备吸附剂和土壤改良剂,通过吸附—脱附和土壤重金属固化试验探究其对含 铅污水和铅污染土壤的处理效果。 结果表明:① 废弃的硅酸钙板和抛光粉的主要成分为托贝莫来石,二者对溶液中 Pb2+均有较好的吸附效果且不易脱附,其中抛光粉吸附剂对 Pb2+的吸附容量为 264. 84 mg / g,废弃硅酸钙吸附剂对 Pb2+的吸附容量为 275. 12 mg / g。 ② 2 种改良剂对土壤中 Pb2+的固化效果良好,若提高相互之间的接触,改良效果有 望进一步提高。 ③ 2 种改良剂均可以降低土壤容重,同时使土壤水分蒸发加快。 研究结果可为硅酸钙板废弃物的消 纳利用提供有益参考。     

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。