SOM法金属氧化物制取金属新技术

以MgF2-CaF2为熔盐电解质,利用固体透氧膜(SOM)法直接电解还原Ta2O5和丁TiO2制备了金属钽和钛,分析了制样压力和电解温度对阴极产物形貌的影响以及电流的变化规律.结果表明:SOM法直接制备金属钽和钛的电解速度快,电流密度高,合理的制样压力为250～332 MPa,电解电压为3.2～3.8 V,电解温度在1 373～1 432 K之间.该方法较FFC有诸多优点,用于对我国各类稀有难熔金属矿资源进行开发利用,具有好的发展前景.     

LiCl-NaCl熔盐中金属钽电化学脱氧过程研究

通过循环伏安法、恒槽压电解并结合SEM、XRD和氧氮分析法研究了LiCl-NaCl熔盐中金属钽的电化学脱氧过程,并考察了石墨阳极气体对脱氧过程的影响.研究结果表明:在LiCl-NaCl熔盐体系中,利用电解可有效降低金属钽中的氧含量,脱氧反应包括Ta2O5→Ta(O)+LiTaO3和Ta(O)+LiTaO3-Ta.熔盐电...     

金属钽丝表面的X射线光电子能谱分析

用X射线光电子能谱（CPS）对金属钽丝表面进行了分析和研究。通过XPS全程宽扫描和窄扫描，分析了钽丝表面的元素成分和钽的化学态。分析结果表明，钽丝表面的元素成分为Ta，C，O，F，S，C1，P，Fe，Si，Ni，Cr，Ti，Nb，W，Al。对溅射5min前后的Ta4f峰进行曲线拟合，分别得到2个Ta峰和4个Ta峰，对拟合后各个Ta峰的相对位置进行分析，可以得出以上各个Ta峰的化学态；钽丝表面钽的化学态分别为，溅射前Ta2O5和TasSi3，溅射后Ta，Ta2O5，TasSi3。     

氧化钽喷涂及涂层熔炼实验

液态铈非常活泼,与很多涂层都发生反应。将钽坩埚表面氧化后熔炼铈已有比较满意的结果,但在石墨坩埚表面喷涂Ta2O5涂层的研究报道却很少。本文总结了石墨坩埚表面等离子及火焰喷涂Ta2O5涂层工艺。在大气中通过热震试验考核了氧化钽涂层相稳定性,在真空感应加热环境下对火焰喷涂氧化钽涂层进行了进一步的热震稳定性考核,采用SEM分析了涂层表面微观形貌,同时采用XRD技术分析了加热前后氧化钽涂层的组成变化,分析表明,火焰喷涂能够制备单一的Ta2O5涂层。石墨坩埚表面Ta2O5涂层熔炼实验表明,液态铈不侵蚀Ta2O5涂层。     

阴极块烧结温度与电解钽粉氧含量的关系

试验以Ta2O5为原料,用水与Ta2O5以一定比例混合,采用粉浆浇铸成型,自然晾干24h,在马弗炉中分别以1000℃、1100℃、1200℃、1300℃烧结6h后制的阴极块为阴极,以石墨为阳极,无水CaCl2和NaCl混合熔盐为电解体系,在800℃的温度下,采用3．2V电解电压进行10h电解,制取钽粉。试验结果表明：采用1200℃烧结6h制备的阴极块电解效率最高,电解产物中的氧含量最低。     

低富集比钽铌产品(Ta,Nb)2O5与长石反磁选精矿Fe2O3的金属平衡

对低富集比钽铌产品及长石产品中的目的元素如何进行金属平衡作了全面论述，以实例方式对(Ta，Nb)2O5与Fe2O3的金属平衡进行计算，对其他类似实验数据及日常生产检测数据的处理具有参考价值。     

钽铌精矿分解后矿渣中(Ta,Nb)2O5的回收利用

叙述了钽铌精矿经酸分解，矿浆萃取，过滤后的残渣采用搅洗，漂洗，摇选的方法成功地回收富集钽铌渣中的Ta2O5,Nb2O5。该回收工艺投资少，操作简便，经济效益可观。     

707阴离子交换树脂吸附钽的性能及动力学研究

本文研究了707阴离子交换树脂从草酸溶液中吸附钽草酸配合物的性能和动力学。试验结果表明在[（NH4）2C2O4]=0．13mol／L、[K2S2O8]=0．024mol／L、[Ta]=8×10－5mol／L、pH=1．5～3．5条件下，钽的吸附率有最大值。测得液膜扩散控制交换速率常数B25℃=2．5×10－4s－1，液膜扩散控制交换活化能Ea=15．96kJ／mol，钽的饱和吸附容量CTa=182．4mg／g干树脂。     

钽酸的合成、表征及催化酯化反应性能

采用KOH熔融法合成了钽酸.利用X射线衍射仪,傅里叶变换红外光谱仪,热重分析仪和紫外-可见-近红外光谱仪对合成的钽酸进行表征.结果表明:钽酸中存在1.8个水,且在制备过程中吸附了硫酸根,经850℃焙烧3 h,钽酸大部分转化为Ta2O5.以钽酸为催化剂,研究其催化正丁醇与冰乙酸反应生成乙酸正丁酯中各种因素对酯化率的影响.实验证明钽酸是合成乙酸正丁酯的良好催化剂.反应条件为:HAc0.167 mol,n(醇):n(酸)=2:1,催化剂用量为HAc质量的7.5%,带水剂环己烷5 ml,回流反应5 h,酯化率达88.8%.     

W-305C树指吸附钽的性能及动力学研究

研究了 W 3 0 5 C树脂从草酸溶液中吸附钽草酸配合物的性能。结果表明 ,在 [(NH4) C2 O4]=0 .1 5 mol/L,[K2 S2 O7]=0 .0 2 8mol/ L,[Ta]=8.0× 1 0 -5mol/ L,p H=2 .0条件下 ,钽的吸附率有最大值 ,Freundlish常数k=3 .48× 1 0 3 ,吸附常数 K2 98=1 .72× 1 0 -4,吸附活化能 Ea=2 5 .70 k J/ mol,树脂对钽的饱和容量为每克干树脂 1 5 3 .5 2 mg。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.