对称四流中间包结构优化

以淮钢连铸中间包为研究对象,通过建立中间包水模型,对对称四流中间包的流体流动特性进行研究。结果表明:原中间包同一侧的两流之间的流体流动特性存在很大差异,与外侧流相比,内侧流的平均停留时间小,死区体积大。四流一致性差导致中间包内钢液温度不均匀,夹杂物不能有效上浮去除,不能很好地满足高质量特钢生产的要求。加装优化后的挡墙、湍流器等中间包控流装置,四流的停留时间分布趋于一致,滞止时间、平均停留时间延长,死区体积减小。     

板坯连铸中间包结构的优化

对鞍钢三炼钢板坯连铸中间包结构进行了优化研究,发现原中间包结构造成钢水在中间包的最小停留时间短和活塞流体积小,死区体积大,不利于钢水中的非金属夹杂物上浮.采用合理结构的挡墙和湍流控制装置能够明显改善中间包内流体的流动特性,可以使钢包长水口注流区上方的液面流动平稳,促进钢水中的非金属夹杂物上浮,提高铸坯质量.     

中间包结构优化及冶金效果

通过水模型实验,对四流圆坯中间包三种挡墙形式下的包内流场进行模拟研究.结果表明:原挡墙控流下的中间包同一侧两流之间的流体流动特性存在很大差异,与内侧相比,外侧流的最小停留时间、峰值时间长、死区体积大,造成中间包内钢液温度不均匀,夹杂物不能有效地上浮去除.U型挡墙能很好地解决各流间的同步性,但是最小停留时间短,死区比例较大.采用Y型挡墙可以有效地改变中间包内流场分布,促进夹杂物上浮,提高钢水清洁度,为三种挡墙形式之最优.工业试验表明,Y型挡墙在降低铸坯总氧和夹杂物方面均优于原挡墙.     

单流板坯连铸中间包流体流动控制与效果

通过物理模拟实验,研究了南钢板坯连铸不同结构中间包的流动特性,优化了中间包结构.中间包结构优化后,最小停留时间提高120%,浓度峰值时间提高97%,死区体积分率降低72%.实验结果表明,开发的异型边结构的湍流控制器可以更好地改善单流中间包的流体流动特性.现场实际应用的结果表明,中间包结构优化后,铸坯夹杂物面积比下降了32%.     

连铸中间包涡流控流槽水模试验

通过水模试验研究了涡流控流槽对连铸中间包流体流动的影响.结果表明:合理结构的涡流控流槽能够改善中间包流体的流动特性,最小停留时间增加,活塞流体积提高,死区体积下降,夹杂物由1.0～1.5级下降到0.5级.     

连铸中间包结构优化及夹杂物去除的水模拟研究

以25t中间包为原型,通过实验相似比λ=1:2.3的水模型,分析了4流近似T型中间包3种挡墙形式包内流场及夹杂物去除。结果表明,原挡墙控流下的中间包同一侧两流之间的流体流动特性差异很大,与内侧相比,外侧流的最短停留时间和峰值时间长、死区体积大,造成中间包内钢液温度不均匀,夹杂物不能有效地上浮去除;U-型挡墙能延长峰值时间,但是最短停留时间短,死区比例较大;采用Y-型挡墙可以有效地改变中间包内流场分布,促进夹杂物上浮。30CrMo钢工业试验表明,采用Y-型挡墙钢中大型夹杂物较原用挡墙降低16.9%。     

四流圆坯中间包的结构优化研究

为净化钢液,提高夹杂物在中间包内的上浮率,通过水模型实验,对4流中间包不同挡墙形式下包内流场及夹杂物去除情况进行了模拟研究.结果表明:现用挡墙控流下的中间包同一侧两流之间的流体流动特性存在很大差异,与内侧相比,外侧流的最短停留时间、峰值时间长、死区体积大,造成中间包内钢液温度不均匀,夹杂物不能有效地上浮去除.改进后的挡墙能很好地解决各流间的同步性,死区比例比原型降低6.65 %,对夹杂物的去除效果增强.工业试验表明,改进后的挡墙在降低总氧和夹杂物方面均优于原挡墙.     

侧孔长水口两流非对称中间包流场优化

 中间包流体流动直接影响连铸坯的质量,为了缩小非对称中间包两流之间的流动差异,利用水模型和数值模拟方法,研究了侧孔长水口中间包流体流动特性。研究结果表明：直通型长水口、圆形湍流控制器和单挡墙结构中间包两出口流体差异较大,侧孔长水口和多孔挡墙结构中间包两流之间平均停留时间差异是直通型长水口中间包的3/4,且近长水口侧出口的平均停留时间延长7.7%。     

单流厚板坯连铸中间包结构优化

针对鞍钢一炼钢的厚板坯连铸中间包,采用冷态物理模拟方法,对中间包的控流装置进行了优化,对实际中间包钢水流动建立了数学模型,得到中间包优化前后钢液流动的速度场。实验结果表明,原结构的中间包的控流装置和布置位置不合理。中间包采用湍流控制器和结构优化后,提高了钢水在中间包的停留时间,死区体积明显下降。实际应用的结果表明,中间包结构优化后,中间包钢液、第1和第3块铸坯试样中的平均夹杂物面积比明显下降。     

六流小方坯中间包气幕挡墙的数学模拟

根据6流200 mm×200 mm方坯30 t中间包的结构操作工艺参数,采用欧拉两流体模型、多孔介质模型、欧拉-拉格朗日随机轨道模型及Monte-Carlo法,并引入气泡吸附模型,用数学模拟法对比研究了采用气幕挡墙技术对6流中间包内钢液流动特性及夹杂物去除的影响。结果表明,采用气幕挡墙技术优化后,可以有效改善钢液的流动状态,均衡各出口停留时间,有效延长钢液的平均停留时间,降低死区体积,提高夹杂物去除率,适应多流中间包超纯净钢冶炼的需求。     

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.