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。     

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。     

液膜法提取铀的探索

本文初步研究了用油包水乳状型液膜从人工配制的硫酸铀酰溶液中提取铀。试验了膜相萃取剂浓度、膜内相试剂浓度、膜外相铀、硫酸根浓度、pH、温度以及某些无机盐对液膜提取铀的影响。结果表明:湾膜法具有提取效率高和萃取剂用量低的优点。例如,膜相含1％三脂肪胺的乳状液自pH1.5、总硫酸根0.2M和铀浓度为500毫克/升的料液中提取铀时,其提取后余液中铀浓度为0.52毫克/升。当外相原始铀浓度为20毫克/升时,液膜法一段提取后余液中的铀浓度降至≤0.05毫克/升。 本文还叙述了用液膜法从两种含铀矿坑水中提取铀的初步研究结果。原始铀浓度为17.8毫克/升的矿坑水,经液膜法一段提取后余液的铀浓度可降至小于0.05毫克/升。 本研究结果表明了用乳状型液膜从硫酸铀酰稀溶液中及含铀矿坑水中提取铀的可能性。     

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.     

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     

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     

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     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

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