机械球磨制备纳米WO3粉末的研究

采用机械球磨湿法工艺制备了纳米级WO3粉末.研究了球磨时间、球料比、固液比等球磨参数对粉末粒度的影响:球磨时间和球料比对粉末粒度影响很大,但过久延长球磨时间或增大球料比并不能起到进一步细化的作用,反而会增加WC杂质的引入量;过高或过低的固液比都不利于WO3粉末的细化.为得到纳米级且纯度较高的WO3粉末,降低WC的含量,经反复实验得到最佳工艺条件为:球料比1:1,固液比1:0.5,球磨时间48 h.     

高能球磨制备纳米WC-8Co复合粉末

对采用高能球磨法制备纳米WC-8Co复合粉末的工艺条件进行了研究。实验采用逐步优化方式,研究液固比、球料比、球磨转速、球磨时间对粉末的特性的影响。采用SEM扫描电镜观察粉末形貌,用EDX能谱分析了粉末中Co元素的分布,检测了粉末中Co的化学成分,确定了液固比参数,通过检测粉末的比表面和BET粒度的变化优化球料比、球磨转速及球磨时间等工艺参数,采用最优化工艺得到了粉末比表面为6.82m2/g、BET粒度为59.4nm,Co相分布均匀的纳米WC-8Co复合粉末。     

高能球磨工艺对WO3晶粒尺寸的影响

用X射线衍射和透射电镜，研究了高能球磨工艺对WO3-CO2O3-C混合粉末中WO3晶粒尺寸的影响。结果表明：球磨时间增长、球磨转速提高和装料比的加大都可有效地降低反应物晶粒尺寸，而且当球磨到一定时间后，WO3和C可以达到纳米级。适宜的制备纳米级WO3-C-CO2O3混合粉的球磨工艺参数应为：球磨筒转速400r／min，球磨时间4～8h，球料比40：1～60：1。     

球磨参数对制备纳米WO_3粉粒度的影响

本文采用机械球磨法制备纳米三氧化钨陶瓷粉末,系统研究了球磨参数对粉末粒度的影响.结果表明,机械球磨法可以制取纯度较高的三氧化钨细粉;球磨时间和球料比以能够使颗粒尺寸趋于稳定的范围时为佳,盲目延长时间、增大球料比起不到细化作用,相反会增加WC杂质的引入.     

振动球磨制备Fe-6.5 %Si硅钢微粉

采用振动球磨法制备Fe-6．5％Si（质量分数）硅钢微粉，试验中对硅钢粉末进行不同球料比、不同球磨时间、干法球磨和湿法球磨制备微粉试验。结果表明：随着球磨时间的延长，颗粒尺寸变细，球磨12h后，颗粒细化速度变慢；加大球料比及延长球磨时间可进一步细化粉末粒度，但对粉末的粒度分布无影响；湿磨比干磨制粉效率高，粒度分布多在小粒级范围内。     

机械球磨法制取超细碳化钨粉的研究

对振动球磨法制取超细碳化钨粉末进行了研究。试验中采用粗、中、细3种碳化钨粉末进行了不同球料比、不同球磨时间的试验。试验得出：延长球磨时间均可制取FSSS粒度小于0.5μm的超细碳化钨粉末；加大球料比及延长球磨时间可进一步细化粉末粒度，但对粉末的粒度分布无影响；球磨后的粉末粒度分布与原始粉末粒度分布有关；球磨时间延长，粉末晶粒尺寸减小、应力增大。     

机械合金化FeCuNiSnCo粉末的制备及其胎体材料物理性能研究

采用机械合金化法制备了Fe基预合金粉（FeCuNiSnCo粉末），通过热压烧结制备胎体材料，对制备的Fe基预合金粉末及其胎体性能进行表征，利用正交实验研究了球料比、球磨转速、液固比、球磨时间等对粉末松装密度和胎体材料硬度、抗弯强度的影响，确定最优工艺，并对胎体材料显微组织进行观察。结果表明:在球磨过程中，粉末颗粒经过重组、变形、破碎和合金化，粉末形貌发生了改变，影响了粉末松装密度；球磨转速和球料比是影响胎体材料硬度和强度的主要因素；综合分析最佳工艺参数为:球磨时间6 h，球磨转速400 r·min-1，球料比4:1，液固比0.5:1.0。     

机械合金化制备纳米TiC增强Ti基复合粉末

采用机械合金化法制备了纳米TiC增强Ti基复合粉末,通过XRD、SEM、TEM和EDS分别表征粉末的物相、形貌、晶体结构和元素分布,探索球磨转速、球料比及球磨时间对复合粉末物相形貌的影响。结果表明:当球磨转速达到300 r/min以上、球料比达到20∶1以上时,球磨效率无明显差异。球磨时间达到10 h,粉末中TiC物相明显;继续延长球磨时间至20 h,得到纳米级TiC增强相。在300 r/min球磨转速、20∶1球料比、20 h球磨时间条件下,可得到纳米TiC增强Ti基复合粉末,粉末中部分区域呈非晶态,大量纳米TiC颗粒弥散分布于粉末中。     

TiH_2/SiC粉末搅拌球磨及真空烧结制备超细晶钛

对TiH2/SiC混合粉末进行搅拌球磨,然后通过压制与真空烧结制备金属钛,研究球料比、球磨转速及球磨时间等工艺参数对球磨粉末粒度与显微组织的影响,并通过对烧结钛的组织观察与分析,研究此工艺制备超细晶钛的可行性。结果表明:适度提高转速或延长球磨时间有利于TiH2粉末的高效细化并提高粉末粒度分布的集中度;在球磨过程中没有发现TiH2分解和形成其他新相的现象;随球磨粉末的中位径D50和粒度跨度值ψ减小,烧结金属钛的晶粒度变得更小、更均匀。在600r/min转速下搅拌球磨8h后的TiH2/SiC粉末,在1050℃/3h条件下高真空烧结后得到平均晶粒度在5μm以下的超细晶钛。     

喷雾转换法制备纳米WC-6Co复合粉的工艺研究

以偏钨酸铵、醋酸钴、有机碳为原料,去离子水为溶剂,采用喷雾干燥-煅烧-球磨-连续还原碳化新工艺制备纳米WC-6Co复合粉。采用氮气吸附法测定粉末比表面积,XRD、SEM分别分析粉末物相和形貌,研究球磨工艺对钨钴复合氧化物粉末性能的影响以及连续还原碳化过程中粉末比表面积的变化。结果表明,在连续还原碳化前进行球磨,可有效破碎粉末;适当增大球料比或延长球磨时间,可使粉末破碎效果更好,粒度分布更均匀,当球料比为10∶1、球磨时间为240min时,粉末破碎、分散效果最佳,比表面积为11.62m2/g;球磨后的钨钴复合氧化物粉末在连续还原碳化过程中发生团聚烧结、预合金化,生成平均粒度为80nm的WC-6Co复合粉。     

China's Major Non-ferrous Metals Imports & Exports

正~~     

Zinc Production by Province in 2014

正~~     

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.