酒钢方坯中间包冶金性能模拟评价

以相似原理为基础,用水模拟钢液研究中间包内的钢水流动特征,通过测定模型中间包内液体的停留时间分布曲线(RTD),计算其平均停留时间及死区、活塞区和混合区的体积。     

25t连铸中间包流场优化水模试验研究

以相似原理为基础,用水模拟钢液研究中间包内的钢水流动特征,通过测定模型中间包内液体的停留时间分布曲线(RTD),计算其平均停留时间及死区、活塞区和混合区的体积。试验表明,经过改进的中间包,其最短停留时间由17s增加到33s,死区体积比则由12.68%降低到7.64%,优化了中间包内的流场。     

DSP钢厂六流小方坯连铸机中间包采用不对称挡板改善钢水流动

多流连铸机的中间包将钢水分配到多个不同的结晶器中去 ,要求分配到各结晶器的钢水温度和速度基本一致 ,但是中间包内各个水口处的钢水温度及停留时间随位置不同而变化。中间包内钢水停留时间不一致和钢水温度不均匀将会影响钢水质量和可铸性。中间包对钢水清洁度、热均匀性及浇铸稳定操作起重要作用 ,这与中间包内钢液流动密切相关。中间包内合理的钢水流动是稳定顺利浇铸的先决条件 ,并有利于提高钢水清洁度及热均匀性。中间包钢水流动性一致时 ,不同出水口处钢水温度及停留时间仍可能出现不一致。钢水停留时间过短时 ,由于钢水温度过高 ,…     

钢水密度对板坯中间包流场影响的数学模型

利用数学模型研究了钢水在常密度和密度变化两种条件下板坯中间包内的流场、温度场和钢水平均停留时间。计算结果表明，高温钢水在中间包内流动时，不能忽略自然对流流动；密度随温度变化时，钢水沿着液面流到水口区，没有短路流现象，最短滞流时间１００ｓ，进出口温差４４℃，其流场和温度场与常密度条件下的正好相反。     

钢水密度对板坯中间包流场影响的的数学模型

利用数学模型研究了钢水在常密度和密度变化两种条件下板坯中间包内的流场、温度场和钢水平均停留时间。计算结果表明，高温钢水在中间包内流动时，不能忽略自然对流流动；密度随温度变化时，钢水沿着液面流到水口区，没有短路流现象，最短滞流时间１００ｓ，进出口温差４４℃，其流场和温度场与常密度条件下的正好相反。     

十流小方坯连铸机双中间包流场的优化设计

对山钢十流小方坯连铸机双中间包进行设计优化，确定合理的中间包结构类型；通过中间包流场、温度场数值和水力学模拟研究，分别为品种钢、普通钢连铸生产设计了L型挡渣墙结构中间包和整体稳流器挡渣墙结构中间包。双中间包结构类型、流场经过优化，延长了钢水在中间包内的平均停留时间，减少了各流间出口钢水温差，提高了钢水纯净度，有效促进了生产的稳定顺行和产品质量的提升。     

中间包稳流器在德马克连铸机上的应用

对中间包稳流器在德马克连铸机上的应用情况进行了研究,分析了其对钢液流动状态和钢水在中间包内平均停留时间的影响.结果表明,使用中间包稳流器能有效地防止短路流,改善中间包冶金效果.     

中间包水模实验研究与应用

利用1：2的水模型实验装置,通过水力型模型实验,优化了扩容后济钢三炼钢中间包挡墙、挡坝的位置。试验结果表明,优化后的中间包流场趋于合理,钢液的最短停留时间为95s,平均停留时间为343s,死区体积减少了2．2％,基本消除了短路,钢水在中间包内停留时间延长,钢中夹杂物减少。     

控流装置对板坯中间包流场优化的影响

根据相似原理,用1:3水模型研究了230 mm×130 mm板坯连铸用60 t中间包内钢水的流动特征,通过测定模型中间包内停留时间分布曲线,计算其平均停留时间及死区,活塞区和混合区的体积。结果表明,采用下挡墙开孔能有效地改善中间包内流场,得出优化后合适的钢包控流装置组合为开孔下挡墙+湍流控制器,下挡墙高133 mm,距离冲击区765 mm。优化后的中间包比原中间包平均停留时间增加了24 s,死区体积由原来的14.8%下降至6.7%。     

水平连铸中间包内钢水流动的水模型研究

依据实际Φ120 mm圆坯水平连铸过程中15 t中间包原型,采用模型与原型之间1:1.5的相似比建立了水模拟系统,对原型中间包内钢液的流场进行了评估,并研究了中间包控流装置对中间包内钢液流动特性影响。结果表明,使用湍流控制器能显著降低中间包中死区比例,但对最小停留时间延长有限;使用导流槽和低坝显著延长钢水在中间包内停留时间,促进夹杂物上浮。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.