纳米Ni粉研制进展

综述了国内外对纳米Ni粉的研制状况。介绍了一种纳米Ni粉的制备方法———封闭循环氢还原法。以NiSO4.7H2O和NaOH为原料,采用沉淀方法制备纳米级的Ni(OH)2粉末,其反应条件为:反应温度25±1℃,反应终点pH值>9,陈化时间1h。用封闭循环氢还原法,在350℃下还原Ni(OH)2得到了Ni粉。其粒径在20~80nm之间,纯度为99.16%。     

纳米铜粉的制备研究

本文研究了化学还原法制各纳米铜粉的方法。本实验以次磷酸钠为制备纳米铜粉的还原剂。实验得出其较佳工艺条件： pH值在1．5—2．0之间，温度60℃左右，高速搅拌，反应时间15—20min，硫酸铜溶液中的Cu^ 2被还原为紫红色粉末。对所得产品进行XRD谱图分析，证实紫红色粉末为铜粉，但其在空气中不稳定，极易被氧化为Cu2O。通过扫描电镜图片观察，所得铜粉一次粒径约为十个纳米，但团聚体为数百个纳米的颗粒。     

阴极旋转电解法制备纳米铜粉的实验研究

本文介绍了一种阴极旋转电解法制备纳米铜粉的方法.通过正交实验得出了电流密度、H+浓度、Cu2+浓度最佳参数,研究了分散剂、阴极板转速对制粉的影响,并对其原理进行了分析.制备出了粒径在20～50 nm,形貌近似球形的纳米铜粉.     

封闭循环氢还原法制备纳米钼粉

通过对MoO3氢还原过程的热力学分析 ,找到了制备均匀细颗粒Mo粉的热力学途径—彻底快速除去还原系统中的水分。设计了封闭还原系统 ,用此系统进行氢气热还原 ,不仅使氢气得到充分利用 ,而且容易判断反应终点 ,缩短了Mo粉在恒温区的时间 ,阻止了颗粒的长大。以 (NH4 ) 6 Mo7O2 4 ·2H2 O为原料制备MoO3。通过系统内的特殊装置除水 ,降低了还原温度和湿度 ,用封闭循环氢还原法还原MoO3,在 65 0℃下得到了Mo粉 ,其粒径在 40～ 80nm之间 ,纯度为 99.62 %。     

NaH_2PO_2对超细铜粉分散性的影响

研究了采用水热法,以葡萄糖预还原法制备的Cu2O为原料、NaH_2PO_2为分散剂制备超细铜粉,考察了NaH_2PO_2对超细铜粉分散性、粒径的影响,借助XRD、SEM、激光粒度分析仪分析铜粉成分、微观形貌、平均粒径。结果表明:当葡萄糖与NaH_2PO_2质量比为4∶4时可以改善超细铜粉的形貌、分散性;应用价键理论解释了NaH_2PO_2在超细铜粉制备过程中的作用。     

超声条件下水合肼还原制备纳米铜粉

在超声条件下以五水硫酸铜为原料,水合肼为还原剂,OP为表面活性剂,氢氧化钠为pH调节剂,制备了分散性较好的球形纳米铜粉.研究了Cu2 外的初始浓度,超声时间,超声功率,超声周期等因素对铜粉粒度及形貌的影响.用SED、TEM及XRD对产品进行表征.结果表明:所制备的铜粉呈球形、粒径分布窄、表面未氧化,平均粒径约为40 nm.     

Cu（OH）2分解方法对纳米CuO形貌的影响

以0.1mol·L-1CuSO4水溶液和4mol*L-1NaOH水溶液为原料,采用沉淀法制备得到Cu(OH)2,再进行Cu(OH)2的分解反应.考察了电子束照射分解、微波分解和热分解等不同分解方法对分解产物形貌的影响.结果表明:纳米Cu(OH)2 的直径为10～30 nm,长度为1～6μm;电子束照射分解干燥的固相Cu(OH)2纤维得到链球状的CuO,Cu(OH)2纤维分散得越好CuO粒度越小;微波分解干燥的固相Cu(OH)2纤维得到链球状的CuO,Cu(OH)2纤维分散得越好CuO粒度越小;热分解干燥的固相Cu(OH)2纤维得到链球状的CuO,其粒径随温度的升高而增大,在温度低于200℃时CuO的粒径约为20nm左右;在液相中先沉淀后升温分解时,CuO的形貌为球形,CuO粒径随温度的升高而增大,60℃分解可得到纳米级的CuO;在液相中先升温后沉淀时,CuO的形貌为纤维状,CuO粒径随温度的升高而增大,60℃分解可得到纳米级的CuO.     

水合肼还原制备纳米铜粉的工艺优化

通过液相还原法水合肼还原制备纳米铜粉,考察了反应温度、抗氧化剂添加量、PVP添加量、反应时间、体系pH值、铜盐浓度、还原剂的浓度等因素对铜颗粒的粒径与形貌的影响。通过对上述影响因素优化,从而得到粒径小、分散性好、空气中抗氧化的纳米铜粉。     

甘油体系中纳米铜粉的制备研究

本课题采用甘油还原铜盐法制备纳米铜粉。将甘油和铜盐按一定量的摩尔配比混合加热,同时加入适量的分散剂PVP,快速搅拌,控温反应一定时间,冷却至室温,产品经无水乙醇稀释后,再用无水乙醇数次洗涤、抽滤,398K真空干燥2h,得到紫色纳米铜粉。并对纳米铜粉进行了XRD、TEM表征。结果表明:所制备的纳米铜粉呈球形,铜粉粒径小于60nm,分散性较好,纯度较高。     

纳米钼粉的制备技术及研发现状

主要综述了机械球磨法、还原法（封闭循环氢还原法、氯化钼还原法、化学水解沉淀-还原法、均匀沉淀-还原法）、电子束辐射法、氯化钼蒸汽法、微波等离子化学气相沉积法、电脉冲法等制备纳米钼粉的研究现状。对我国纳米钼粉研究的发展趋势进行了展望。     

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.