熔盐电解直接制备钛铬合金的研究

在熔融CaCl2体系中,以二氧化钛和氧化铬的混合物为阴极,石墨为阳极,在电解温度900℃,槽电压2.8 V条件下进行电解,研究了熔盐电解金属氧化物直接制备钛铬合金的可行性。采用SEM,EDS,XRD等方法对电解还原产物进行了分析,结果表明,二氧化钛和氧化铬的混合物被还原为TiCr2合金,组成符合设计配比。混合氧化物的还原经历了优先生成金属Cr到形成TiCr2的合金化历程。     

氧化镍粉制球直接电解試验

在粉状氧化镍生产电解时,由于电炉还原熔炼过程中消耗较大,且耗电量多,因此我厂试用了氧化镍粉制球→煤炉还原→直接电解的新工艺。其工艺流程如下图:     

TiO2直接还原法提取金属钛研究进展

介绍了二氧化钛直接还原法提取金属钛的各种工艺,包括:剑桥大学发明的FFC工艺、Ono和Suzuki提出的OS(钙热还原)工艺、Park等将EMR(电子中介反应)和MSE(融盐电解)的概念结合起来用于TiO2的金属热还原以及Okabe等提出的PRP(预制还原)工艺.并在此基础上对比分析了这些新工艺各自的特点,综述了国内有关直接还原法提取金属钛的研究进展,指出二氧化钛直接还原法提取金属钛工艺最有希望取代传统的Kroll法.     

二氧化钛直接还原制取金属钛的工艺进展

镁热还原法（Kroll法）是实现工业化的海绵钛生产方法, 由于此法工艺流程长, 过程复杂而使得钛的生产成本居高不下, 严重影响了钛的应用, 因此有必要开发新的钛制取方法. 近年来由二氧化钛直接还原制取金属钛的工艺引起了研究者的广泛兴趣, 尤其是剑桥大学发明的FFC工艺在国际上掀起了新的钛还原工艺研究热潮, 随后Ono 和Suzuki提出了OS（钙热还原）工艺;Park等将EMR（电子中介反应）和MSE（融盐电解）的概念结合起来用于TiO2的金属热还原;Okabe等提出了PRP（预制还原）工艺. 介绍这几种二氧化钛直接还原的新工艺并对比分析了各自特点和发展趋势, 指出FFC工艺最有希望取代传统的Kroll法.     

熔盐电解法制备金属钛的研究

对不同重量的TiO2电极熔盐电解法制取金属钛进行了研究,分析了电解过程中的电流变化、物相组成和形貌特征.实验表明,电解前期,形成了中间产物CaTiO3,这也是主要的中间产物,随后形成的中间产物有Ti4O7、Ti3O5和Ti2O3等较高价钛氧化物,随着电解进行,它们逐步被还原为较低价的钛氧化物和纯钛.电解21h以上,产物为纯钛,氧含量为0.34％左右;延长电解时间到30 h后,电解得到的纯钛衍射峰值降低、峰也有所宽化,这可能是纯钛中固溶入一些杂质造成的,同时电解产物的晶粒显著增大.电解不彻底时,会有TiC中间产物保留在电解产物中.在TiO2的电化学还原过程中,氧的离子化机制和钙热还原机制同时存在.     

LiCl-KCl熔盐中电解还原钛铁矿的研究

在LiCl-KCl熔盐中,采用熔盐电解法还原钛铁矿,研究了电解时间、槽电压及电解温度对还原钛铁矿的影响,探讨了在熔盐中钛铁矿电解脱氧的机理。结果表明,钛铁矿还原优先生成铁,钛氧化物由高价到低价逐步还原,而未得到金属钛及其合金,说明在LiCl-KCl熔盐中,TiO的脱氧还原是钛铁矿熔盐电解生成金属钛及其合金的反应限制性步骤。     

钛矿渣电硅热法冶炼硅钛铁合金的热力学研究

本文分析了关于硅还原二氧化钛反应能够进行的几种解释,用正规离子溶液模型计算了钛矿渣中TiO_2和SiO_2的活度,用Wagner公式计算了硅钛铁三元合金系中硅、钛的活度。根据溶渣、合全体系中组元活度计算结果计算了实际条件下硅还原二氧化钛反应开始时的自由焓变化,从热力学上证明硅还原二氧化钛反应能够进行。     

CaCl_2熔盐直接电解还原钛铁矿的研究

在CaCl_2熔盐中,采用熔盐电解法还原钛铁矿。在槽电压分别为3.0V和3.1V、825～900℃时,研究了不同槽电压及电解温度对钛铁矿电解还原的影响,并对钛铁矿电解脱氧过程进行了讨论。结果表明,在电解过程中铁优先还原,反应区中铁含量高时易形成TiFe_2合金;槽电压对钛铁矿电解产物有重要影响;提高反应温度有利于促进铁钛的互扩散合金化过程。     

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.     

基于直接还原-电解工艺金属钛制备装备的开发

直接还原-电解制备金属钛流程主要包括原料处理、转底炉直接还原、电炉熔融分离及高温直流电炉电解。作者通过工艺研究,流程设计以及装备开发,并在转底炉直接还原钛渣生产线及金属钛电解生产线的实践基础上,介绍了转底炉直接还原制钛渣装备及金属钛直流电解装备的特点,同时总结出装备在使用中应该注意的一些常见问题。     

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.