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采用液相线半连续铸造法,研究了AlSi7Mg铝合金的铸造显微组织,在液相线温度下半连续铸造AlSi7Mg铝合金铸造组织为均匀,细小的近等轴晶组织,晶粒平均等级圆直径为34.5um,最小直径为5.8um,最大直径为92um,晶粒平均圆度为1.88,最小圆度为1.18,最大圆度为5.82。 相似文献
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从湿法硫酸镍中去除锰、铁的新工艺研究 总被引:2,自引:1,他引:1
简这了湿法制备硫酸镍过程中以NaClO为氧化剂,CaCO3为中和剂除锰,铁工艺中存在的主要问题,针对这些问题,将该工艺改进为以KMnO4为氧化剂,NaOH为中和剂去除锰,铁,结果表明,新工艺有效扼制了原工艺中存在的主要问题,较大地提高了生产效率,降低了生产成本。 相似文献
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对峨口磁铁矿配加碳酸铁精矿生产氧化球团进行了研究,研究表明,碳酸铁矿尽管烧损大,焙烧时收缩严重但其中含有较高的CaO、MgO等生氧化物,对于高炉冶炼极为有利,在碳酸铁精矿配比为50%,预热温度为800℃,预热时间为20-30min,焙烧温度为1270℃,焙烧时间为20-30min的工艺条件下,可生产出抗压强度大于2000N/个,还原率为86.85%,MgO含量为4.03%的优质球团矿。 相似文献
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焦化厂干熄焦车间循环风机采用高压变频器进行调速,变频器为美国罗宾康公司生产的完美元谐波系列的高压变频器,高压电机功率1900kW,高压变频器容量2000kW,变频器输入电压为10kV,变压后6kV直接输出,变频器为高-高结构,输出为单元串联移相式PWM方式,输出电压为13电平,线电压为25电平,系统采用一体化结构,用户只需高压输入和输出、低压控制电源和控制信号线即可。 相似文献
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某铅锌矿选矿工艺试验研究 总被引:5,自引:0,他引:5
在高碱性条件下,对内蒙古某铅锌矿进行了分选试验。用乙黄药为捕收剂,ZnSO4和Na2S为抑制剂优先选铅,然后用CuSO4为活化剂,用乙黄药选锌。闭路试验结果表明,铅精矿中,铅质量分数为72.23%,铅回收率为87.21%;锌精矿中,锌质量分数为51.50%,锌回收率为85.22%。该工艺已投入生产。 相似文献
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2000年12月美国Timet公司经营部副经理访日期间,在记者招待会上概述了目前有关钛的需求和今后的预测问题。由于受亚洲经济不景气的影响,世界钛需求从1997年的6万t急剧下降到1999年的4.8万t,1999年年中降至最低,此后开始回复。从2000年10月末的数据看,2000年的需求量定会超过5万t。根据1999年世界钛需求统计结果,在航空需求的41%中,民用飞机为35%,军用飞机为6%;在非航空领域的48%中,化学工业为14%,电力为11%,热交换器5%,海水淡化为5%,其它为13%;在新用途中,体育运动器材为7%,装甲为2%,其它为2%,共计11%。1999年美国民用… 相似文献
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陈艳艳 《Canadian Metallurgical Quarterly》2011,(10)
我们常说教学要以学生发展为主旨,以教师为主导,以学生为主体,以训练为主线。在英语教学中应以弘扬学生的主体性为宗旨,突出学生的主体地位,努力构建以学生为主体的课堂教学模式,引导学生积极参与课堂教学,教学活动中师生的和谐交往可以激发学生对认知的兴趣,促进学生在语言学习中主动探索,不断发展语言的实践能力,使学生在轻松愉悦的意境中提高运用英语的能力。 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献
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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. 相似文献