尉犁蛭石微波膨胀试验研究

对新疆尉犁蛭石样品采用微波加热法和900℃电加热法制备膨胀蛭石,并对制备的膨胀蛭石样品进行SEM、XRD分析。结果表明:微波法制备的膨胀蛭石层与层之间分离彻底,层间孔隙多,平均膨胀度大于电加热膨胀蛭石的;蛭石层间距变化小;蛭石层间铁离子没有发生氧化反应,膨胀后颜色为银灰色,蛭石不发脆。对蛭石样品用不同功率相同时间、相同功率不同时间微波加热后发现:微波加热时间为50s、功率为400W时蛭石的膨胀度最大。     

微波法制备膨胀蛭石的试验研究

对采自新疆尉犁蛭石矿的工业蛭石样品采用微波加热法进行了微波膨胀研究,研究了在不同微波功率和作用时间条件下工业蛭石的体积膨胀率、密度和质量变化,并对制备的膨胀蛭石进行了XRD分析。结果表明:在一定的微波功率条件下加热一定时间后,可使工业蛭石样品膨胀。工业蛭石的失重和膨胀倍数随微波功率的增大和作用时间的延长而增大,而堆积密度减小。随着微波功率的增加,达到相同膨胀倍数时所需的时间变短。采用微波加热法,所采工业蛭石样品的最大膨胀倍数约为4.5左右。膨胀蛭石具有与金云母相似的晶体结构。     

工业蛭石的矿物学属性及在“双碳”战略中的作用

基于工业蛭石的化学成分、矿物组成及热学与阳离子交换性等矿物学属性，重点讨论了灼烧膨胀法、插层膨胀法和插层-微波膨胀法对国内不同产地膨胀蛭石膨胀率的影响。结果表明，工业蛭石的矿物组成以金(黑)云母-蛭石间层矿物为主，含少量蛭石或金云母；工业蛭石由于结构中含有蛭石晶层而具有良好的加热或插层膨胀性与阳离子交换性；相对于灼烧加热膨胀法，采用微波膨胀法、插层膨胀法和插层—微波膨胀法可制备结构层不被破坏的高强度柔韧性膨胀蛭石。采用复合插层—微波膨胀法制备的高膨胀率膨胀蛭石为长条蠕虫状多孔轻质材料，膨胀倍数高达36倍，堆积密度仅为0.033 g/cm3，具有优异的轻质、保温和绝热性能。工业蛭石矿产具备战略性新兴矿产的许多特征，具有节能降耗和控制能耗强度并助力碳减排碳达峰的功能，在“双碳”战略和环保节能领域具有重要的作用。      

酸活化膨胀蛭石的制备及吸附性能研究

基于工业蛭石具有良好的加热膨胀性、阳离子交换性和吸附性,对采自新疆尉犁蛭石矿的工业蛭石样品进行微波化学膨胀处理和酸活化处理,并对处理后的样品进行了XRD、比表面积和脱色率等分析.考察了酸浓度、时间、温度等实验参数对酸活化样品脱色性能的影响,确定了最佳工艺条件.结果表明:膨胀蛭石样品在酸浓度为2.5mol/L,活化时间为...     

微爆法解离蛭石的工艺可行性研究

微爆解离蛭石主要通过溶剂加压浸润预处理及溶剂瞬间蒸发形成的冲击力场实现蛭石膨胀解离。结合扫描电子显微镜(SEM)、粒度和X-粉末衍射(XRD)分析,客观评价了微爆法解离蛭石工艺的可行性。结果表明,微爆处理具有粉碎和解离蛭石的双重功效;强极性有机溶剂DMF具有优于水的解离能力;微爆处理不同于热处理,对蛭石的晶体结构无破坏作用;适度提升溶剂用量有利于提升溶剂浸润程度,过大蒸汽压则压缩湮灭蛭石各类孔隙,难以实现扩展层间距的目标。     

微波膨胀对石墨性能的影响

以四种不同粒度的石墨经化学法制备可膨胀石墨,通过微波加热及高温加热制备出膨胀石墨.对比研究其膨胀倍数、硫分、灰分及挥发分,结果发现用微波法制备膨胀石墨,其硫分低于高温法制备的膨胀石墨.而对于膨胀容积和挥发分,微波法制备的大鳞片的石墨优于高温法制备的膨胀石墨.实验同时表明相比传统高温膨化法,微波法具有高效和节能的优点.     

膨胀蛭石的微波法制备及在建筑节能减碳中的应用

基于蛭石结构层水分子遇热瞬间汽化导致体积快速膨胀的特点,采用微波法和微波化学法对工业蛭石进行加热膨胀处理制备不同粒径的膨胀蛭石,研究了模压成型和浇注成型工艺制作膨胀蛭石/石膏基复合保温板的力学和热学等性能,评价了膨胀蛭石保温材料在建筑内墙和热工管道保温的节能效果。结果表明:以微波化学法制备的膨胀蛭石为骨料制作的保温板具有更小的密度和导热系数（0.082 W·m-1·K-1）,含水率稍高;膨胀蛭石/石膏复合保温板的密度、导热系数和抗压强度随膨胀蛭石的片径增大而减小;在冬季室外平均气温为7℃条件下,与内墙和管道未增加保温层相比,节能保温样板和管道保温样板节能效率都稳定在20%,在建筑节能领域具有广阔的应用前景。      

蛭石的结构修饰及有机插层试验

用酸处理 热处理 钠化综合法，对蛭石进行了结构修饰改性，得到具有低剩余层电荷的改性蛭石。用十六烷基三甲基溴化铵(HDTMAB)对改性蛭石进行了有机插层试验，并与未改性蛭石原样的插层试验进行对比，以研究结构修饰及剩余层电荷变化对其有机插层的影响。结果表明，由于剩余层电荷的降低，十六烷基三甲基溴化铵在改性蛭石层间的插层量和排列方式与在蛭石原样中不同，当HDTMAB用量小于5倍数CEC时，进入层间域的HDTMAB数量少，呈倾角较小的单层倾斜排列，蛭石层间距小，有序度低；当HDTMAB用量等于5．0倍CEC时，HDTMAB在蛭石层间以双层倾斜方式排列，层间距与有机插层蛭石原样相当；当HDTMAB用量达到10．0倍CEC时，蛭石层间以双层倾斜排列的HDTMAB倾角增大，层间距较同样条件下插层的蛭石原样更大，而且大部分蛭石已层剥离。因此，结构修饰有利于制备聚合物／蛭石纳米复合材料。     

河南灵宝-陕西潼关工业蛭石热处理及X-射线衍射研究

为了了解蛭石在加热过程中结构的变化,本文对不同结构与成分类型的工业蛭石进行了加热处理,并进行了结构的X-射线定向晶片分析。结果表明,300℃时蛭石晶层完全失去层间水,900℃工业蛭石结构严重或完全破坏,出现玻璃相并伴有新相出现。     

膨胀蛭石表面疏水改性的实验研究

以硬脂酸和硬脂酸钠为表面改性剂,在液相介质中对微波法膨胀的膨胀蛭石进行有机改性。按正交实验,研究了改性剂用量、反应时间和温度对改性样品吸水率的影响,并对表面改性样品进行了FT-IR、活化指数和接触角的测试,确定了最佳改性工艺条件。结果表明,改性剂的疏水基团已经化学偶联到膨胀蛭石的表面,经过硬脂酸改性的样品与水接触角可达60.9°,活化指数为25.51%;而硬脂酸钠改性的样品接触角则达到103.1°,活化指数为74.83%。改性后的膨胀蛭石显示出良好的疏水性。     

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。