采用Y型微通道反应器强化萃取水相中的铒

采用Y型微通道萃取技术萃取水溶液中的稀土铒,考察了Y型微通道尺寸、有机相浓度、皂化度、有机相中铒预负载量、水相初始pH值和水相初始铒浓度等因素对稀土铒萃取率的影响。结果表明,微通道尺寸对铒萃取率有重要影响,管径越长,萃取率越高;管径越小,萃取率越高。微通道长度50cm、直径0.6mm、停留时间为2.12s时,铒萃取率高达99.39%。随着有机相中P507浓度的增加,水相中铒萃取率增加。随着有机相中铒负载量的增加,水相中铒萃取率降低。随着有机相中P507皂化度的增加,铒萃取率先增加后降低,皂化度为5%时,萃取率最大。原因是皂化度大于5%时,有机相理化性质的变化会导致有机薄膜失稳乳化,降低了萃取效率。随水相初始pH值和初始铒浓度的增加,铒的萃取率均减小。研究结果可为Y型微通道萃取技术在低浓度重稀土萃取上的应用提供理论基础和技术依据。     

用硫代硫酸盐溶液浸出和回收金

在本研究中,应用硫代硫酸铵溶液浸出海绵金(纯度为99 92 % ) ,考察了CuSO4 、(NH4 ) 2 S2 O3、(NH4 ) 2 SO4 、NH4 OH和浸出时间对金的浸出率和硫代硫酸盐氧化率的影响。在反应中,用铜离子作为金溶解的催化剂,但它也加速了硫代硫酸盐的氧化(消耗)。研究发现,金浸出的最佳条件为:(0 8～1 0 )·10 3mol/m3(NH4 ) 2 S2 O3、3 0mol/m3CuSO4 、(2 0～3 0 )·10 3mol/m3NH4 OH、(0 4～0 5 )·10 3mol/m3(NH4 ) 2 SO4 、pH为10±0 2、搅拌速度15 0r/min和浸出时间43 2ks。硫代硫酸盐的氧化率约为初始浓度的15 %。研究还发现,用三辛基甲基氯化铵(TOMAC)作为萃取剂从含金溶液中回收金不需要对pH值和其他条件调节。考察了金的浓度、pH值、氨浓度、硫代硫酸盐和铜离子浓度、萃取剂和稀释剂浓度以及萃取时间对金萃取率的影响。试验发现,硫代硫酸盐溶液在最佳浸出条件下(萃取剂用正辛烷稀释至180mol/m3,有机相与水相比为1∶1,萃取时间0 6ks) ,金的萃取率可达10 0 %。用10 %的硫脲可反萃取10 0 %的金     

Y型微通道反应器强化萃取水相中铒的研究

本文采用Y型微通道萃取技术，以水溶液中稀土铒为研究对象，考察了Y型微通道尺寸、有机相浓度、皂化度、有机相中铒预负载量、水相初始pH值和水相初始铒浓度等因素对稀土铒萃取率的影响。结果表明，微通道尺寸对铒萃取率有重要影响，管径越长，萃取率越高；管径越小，萃取率越高。微通道长度为50cm，直径为0.6mm时，停留时间为2.12s，铒萃取率高达99.39%。随着有机相中P507浓度的增加，水相中铒萃取率增加。随着有机相中铒负载量的增加，水相中铒萃取率降低。随着有机相中P507皂化度的增加，铒萃取率先增加后降低，皂化度为5%时，萃取率最大。这是由于皂化度大于5%时，有机相理化性质的变化将会导致有机薄膜失稳，引起乳化，降低了萃取率。随水相初始pH值和初始铒浓度的增加，铒的萃取率均减小。本研究可为Y型微通道萃取技术在低浓度重稀土萃取上的应用提供理论基础和技术依据。     

塔式萃取过程中pH的测量和控制

《Minerals Engineering》2 0 0 1年第 1期上发表了 Zhuang Y.等人文章 ,介绍塔式萃取过程中 ,p H测量和控制的试验研究结果。含有 H 和 OH-的溶剂萃取 ,控制水相 p H值能有效调节萃取反应的平衡状态 ,从而控制金属萃取率、选择性和溶剂的溶解度。当电极直接插入乳状液 (混合相 )中测定 p H时 ,由于电极玻璃膜表面部分或全部被有机相覆盖 ,因而所测出的 p H值不能真实反映水相中的 H 浓度。混合相 p H值与水相 p H值之间的差值 ,与混合相的类型 ,即水相连续 (O/ W)还是有机相连续 (W/ O)有很大关系。试验发现 ,W/ O比 O/ W时的 p …     

混盐型高锂卤水萃取分离锂

以阿根廷某高锂混盐型盐湖卤水萃硼后得到的萃余液为研究对象,采用磷酸三丁酯(TBP)- FeCl3体系萃取分离锂,考察了铁锂比、TBP浓度、稀释剂种类、萃取相比O/A、有机添加剂种类及浓度等因素的影响,优化了萃取工艺参数,分析了锂在萃取两相体系中的分配行为以及锂与镁、钠和钾的分离情况。在有机相组成为65% TBP - 5%MIBK - 30% 260#溶剂油、铁锂比1.5:1、相比O/A=2:1、萃取混合时间5 min、室温的条件下,锂的单级萃取率大于79%,镁、钠、钾的萃取率分别仅有5.24%、8.57%和0.88%,Li与Mg、Na、K的分离系数分别达到62、37和388,TBP显示出对锂的良好选择性,且MIBK的加入改善了分相和锂萃取性能。夹带与共萃进入有机相中的镁、钠和钾可用氯化锂的稀盐酸溶液洗涤去除。负载锂的有机相可用7 mol/L盐酸进行反萃,得到富锂溶液。     

盐酸胍从碱性氰化液中萃取金及机理研究

研究了盐酸胍直接从碱性氰化液中萃取金的性能。考察了胍的浓度、氯离子浓度、水相中金的浓度、萃取时间、相比对金的萃取率的影响。胍的浓度小于0、04mol／L时，金的萃取率低于72％，而在有机相中加入磷酸三丁酯TBP后，能使低浓度的胍对金有比较高的萃取率，如胍浓度为0．04mol／L和TBP浓度为40％（V／V）时，金的萃取率达到91％。实验测出了胍从碱性氰化液中萃取金的方程式。研究了KSCN反萃金的性能，KSCN浓度为12g／L时金的反萃率达到最高，为86．7％。     

疏水性低共熔溶剂萃取分离镍钴的研究

采用三辛基甲基氯化铵（Aliquat 336）与薄荷醇组成的疏水性低共熔溶剂（DES）为萃取剂,从硫氰酸钠溶液中分离Co(Ⅱ)和Ni(Ⅱ),考察了SCN-浓度、温度、酸度等条件对萃取分离性能的影响,研究了Co(Ⅱ)和Ni(Ⅱ)的反萃行为,并采用紫外-可见吸收光谱分析了疏水DES萃取Co(Ⅱ)的机理。结果表明,Co(Ⅱ)和Ni(Ⅱ)的分配比随着SCN-浓度的增加而增加,温度和酸度对镍钴的萃取分离性能影响很小,优化条件下Co(Ⅱ)和Ni(Ⅱ)的分离因子大于400。萃入有机相的Ni(Ⅱ)可采用0.1 mol/L NH3?H2O + 0.1 mol/L NH4Cl + 4 mol/L NaCl溶液洗涤到水相,有机相中的Co(Ⅱ)可采用1 mol/L乙二胺完全反萃。该DES体系萃取Co(Ⅱ)的机理符合阴离子交换。     

TRPO-TBP混合体系对碱性氰化液中金的萃取

用三烷基氧化膦(TRPO)、磷酸三丁酯(TBP)与煤油组成的混合萃取体系,对碱性氰化浸金液中Au(Ⅰ)的萃取和反萃取进行了研究。考察了有机相中TRPO及TBP体积分数、料液中盐析剂浓度、Au(Ⅰ)浓度、pH值及萃取时间等因素对萃取率的影响,对比了不同反萃剂对负载有机相中Au(Ⅰ)的反萃效果。结果表明,采用8%TRPO+8%TBP+84%煤油组成的有机相,在相比O/A=1∶1时,对Au(Ⅰ)浓度为28.54 mg/L、盐析剂硫酸锂浓度为1.0 mol/L的碱性氰化液进行萃取时,Au(Ⅰ)的单级萃取率可达96%以上;在体系温度为60℃,用蒸馏水作反萃液对负载有机相中的Au(Ⅰ)进行反萃时,反萃率达到94.08%。     

TBP从硫酸体系中萃取铌的基础研究

探索了TBP在无氟硫酸体系中萃取铌的相关影响因素,并通过引入草酸改善TBP在低酸萃取效率低的问题.主要研究了硫酸浓度、硫酸盐浓度、混相时间及多级错流萃取对铌萃取率的影响.结果表明:铌萃取率随硫酸浓度升高而增加,并在酸度为8~9 mol/L时稳定在70%左右;硫酸盐对萃取有抑制作用;在混相时间为1 min时,萃取反应即可完成;在多级错流萃取试验中,高酸度条件下三级错流萃取可萃取大部分铌,但是低酸度条件下效果不理想,引入草酸可改善TBP对铌的萃取低的问题;用草酸溶液反萃有机相中的铌,两级反萃可反萃98%以上的铌.     

TBP萃取铋电解液中的锑

研究用TBP从铋电解液中萃取分离锑铋,考察了溶液中锑铋以单组分存在时,初始水相酸度、TBP浓度和相比对锑铋萃取分离的影响,绘制了锑铋的萃取等温线。结果表明,有机相组成为25%TBP-7%辛醇-磺化煤油,初始水相酸度为6 mol/L,萃取相比O/A=1∶1时,锑的萃取分配比最大,铋的分配比较小。对于实际铋电解液中萃取分离锑铋,铋电解液盐酸浓度为4 mol/L,相比O/A=1∶1,有机相组成为25%TBP-7%辛醇-磺化煤油时,锑的萃取率为65%;经过3级逆流萃取,锑的萃取率达94.2%。     

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     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸，掘进巷道受深部高应力的影响越来越大，巷道围岩整体稳定性差，矿山压力显现越剧烈现象，一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术，依据对巷道掘进之后变形监测数据的采集，对巷道变形机理进行分析研究，并对注浆时段进行了合理选择，在对巷道的注浆工艺进行了充分论证的基础上，对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要，巷道在恰当的时间内进行注浆加固施工，能有效控制巷道的变形，巷道注浆后变形量明显减小，岩体的稳定性明显增强，减少了巷道日常维修工作，降低了矿井的生产成本，保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

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