减压膜蒸馏法脱除水溶液中氨——艺条件影响研究

对减压膜蒸馏法脱除水溶液中氨进行了研究,实验用膜有效面积是200 cm2.实验考察了起始浓度(0.4～1.6mol/L)、料液进口温度(42～56 ℃)、料液流量(33～84 mL/s)及减压侧压力(8～14kPa)对脱氨效果及平均水通量的影响.实验结果表明起始浓度对脱氨及平均水通量有一定影响;增加料液进口温度使得脱氨明显加快,但平均水通量同时急剧增大;增加料液流量,特别当料液处于层流区时,使得脱氨加快,但对平均水通量影响不是非常明显;在一定范围内,减压侧压力对脱氨基本无影响,但降低减压侧压力却使得平均水通量明显增大.     

减压膜蒸馏法脱除水溶液中氨——传质系数研究

推导了传质系数计算公式，讨论了各种影响因素与传质系数的关系，并对传质数学模型计算的脱氨值与实验测定值进行了比较，结果表明，起始浓度与传质系数无关，随着料液温度的增加，传质系数呈指数增大，料液流量增加，传质系数增大，特别在流体处于层流区时更为明显，在一定范围内，减压侧压力对传质系数基本无影响；脱氨计算值与实验测定值吻合较好。     

减压膜蒸馏法处理石煤提钒高浓度氨氮废水实验研究

利用减压膜蒸馏设备处理石煤提钒高浓度氨氮废水, 考察了料液pH值、进料温度、进料流量、渗透侧真空度等操作条件对脱氨效率的影响。试验表明, 随着pH值的升高脱氨效率明显增大, 当pH值为11.0时, 脱氨效率达到93.73%。提高料液温度或料液流量都可以提高脱氨效率。在一定范围内提高减压侧真空度, 可以提高脱氨效率, 但当真空度高于0.08 MPa以后, 提高真空度对脱氨效率的影响不明显。在相同条件下, 处理高盐度的石煤提钒废水比处理同等氨氮浓度的水溶液的脱氨效率高1.79%。     

支撑液膜法提取稀土的动力学

研究了以聚丙稀为支撑膜，以二（２－乙基已基）磷酸为载体提取稀土的支撑液膜体系。通过实验确定为料液的ｐＨ值，载体浓度等与稀土离子渗透系数之间的关系；建立了动力学方程；并计算了料液－膜侧传质边界层的厚度和稀土配合物在膜内的扩散系数。     

真空膜蒸馏处理高矿化度矿井水试验研究

基于高矿化度矿井水在我国西部煤矿区普遍存在的现状,为实现矿井水的高效利用,提出了采用膜蒸馏处理高矿化度矿井水的技术思路,膜蒸馏技术可充分利用西部矿区丰富的低品位热源,实现矿井水的大规模低成本处理。采用疏水性聚偏氟乙烯（PVDF）中空纤维膜,在石灰-纯碱法软化处理的基础上,对真空膜蒸馏（VMD）处理高矿化度矿井水技术进行了试验研究,着重探讨了热料液温度、热侧流量和冷侧真空度等操作条件对VMD过程的影响;分析了VMD浓缩过程中膜通量、脱盐率等膜性能的变化;考察了长期运行过程PVDF膜性能的稳定性。试验结果表明,对于硬度高而碱度低的矿井水,石灰-纯碱法可有效去除其硬度成分,投加质量浓度为600 mg/L CaO和500 mg/L Na2CO3可使矿井水中硬度的去除率达到77%以上;对VMD膜通量影响的重要性由强到弱依次为冷侧真空度、热料液温度、热侧流量,本试验的最优操作条件为温度75℃、流量1 L/min、真空度90 kPa;维持最优操作条件,VMD浓缩过程的初始膜通量约13.4 kg/（m2·h）,分别浓缩5、14.5倍时,膜通量降至初始值的81.22%和34.51%,脱盐率则始终在99....     

膜法回收稀土冶金过程中废酸的可行性研究

对用减压膜蒸馏法及扩散渗析法回收稀土冶金过程中的废酸(盐酸及硫酸)的可行性进行了研究。结果表明, 减压膜蒸馏能回收稀土氯化物溶液中高达80%的游离盐酸, 且由于对稀土离子的截留率一般大于98%, 在减压侧能回收得到较纯的盐酸溶液; 扩散渗析法也能有效回收硫酸稀土溶液中的硫酸, 在实际操作时控制硫酸回收率为70%～80%, 水料流量比在1左右较为合适; 采用减压膜蒸馏与扩散渗析的集成膜法回收硫酸稀土溶液中的硫酸, 对稀土离子的截留率基本无影响, 但增大了回收液的硫酸浓度, 大大减少了扩散渗析的处理量, 而浓缩倍数越大效果越明显。     

Cyanex272作载体的乳状液膜提取稀土的研究

以新型萃取剂Cyanex272作乳状液膜的载体，从南方离子型稀土矿浸矿液中提取稀土。采用单因子循环法考察了膜溶剂、载体浓度、表面活性剂种类及浓度、油内比、内相酸度、料液浓度、水乳比、时间、温度等因素对提取率的影响，得到优化的膜配方及工艺条件。结果表明：对初步除杂的实际浸矿液，经一次间歇式富集,其稀土提取率大于99％，富集液中稀土浓度大于90g/L，提取效果好。     

一水硬铝石型铝土矿盐酸浸出脱铁过程表观动力学

本文初步研究了一水硬铝石型铝土矿盐酸学浸出脱铁过程的表观动力学。结果表明,浸出速率随温度升高而明显加快,随酸度增大而有所加快。当ｘ≤０．２０,浸出过程速率由界面化学反应控制,当ｘ＝０．２０－０．８０,速率过程由多孔固体中的液膜非稳态扩散控制。     

醇水体系渗透汽比膜分离过程的溶解—扩散模型

采用溶解－扩散模型，对三醋酸纤维素膜用于乙醇－水休系渗透汽化分离过程进行数学模拟，计算膜的渗透通量和分离因子，计算结果与实测值基本相符。通过模拟计算求出了组分在膜内浓度分布，表明膜近真空侧存在一很薄的“干膜区”。     

聚乙烯醇—壳聚糖共混膜渗透汽化分离过程特性

用自制聚乙烯醇－壳聚糖共混复合膜分离乙醇－水溶液，考察了料液浓度、温度和流速等因素对渗透汽化过程的影响。提出了膜分离过程特性关联式。     

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。