复吹转炉底吹喷粉实验研究

在1:6物理模型上,通过水模实验对复吹转炉底吹喷粉时熔池搅拌情况进行了研究.结果表明:喷粉对熔池搅拌有明显的促进作用.喷粉条件下,均混时间随顶吹气体流量的增加存在最小值,最佳顶吹气体流量为117.0 m3/h,增加底吹气体流量对降低均混时间有利.在本实验范围内最佳顶吹流量为117.0 m3/h、最佳底吹流量为2.36 m3/h.     

大中型转炉底吹模拟研究与结构优化

优化转炉底吹布置方式，对于减小熔池内死区占比，改善熔池内部流体的动力学特性具有重要意义。本文以260t转炉为对象，提出“小集团”布置形式，通过数值模拟建立底吹模型，优化“小集团”布置方案。结果表明：“小集团”形式非对称集中布置在0.4D和0.6D上，并且“小集团”夹角为15°时，转炉池具有最好的动力学特性；基于该方案的布置，底吹流量720Nm³/h时取得最佳效果，继续增加流量熔池死区比例与混匀时间减少不再明显。相关结论为大型转炉的底吹优化提供借鉴。     

120t复吹转炉底吹供气优化的模拟研究

针对天津钢铁集团有限公司120t复吹转炉,通过水力学物理模拟对转炉底吹供气进行了优化研究,寻求合理的底吹供气模式并进行生产实践。结果表明：转炉底吹对转炉熔池搅拌有很大的影响,喷嘴数目增加,熔池混匀时间有减小的趋势,与喷嘴流量均分模式相比,流量直线模式和“V”型模式混匀时间都得到改善,直线模式更有利于熔池的搅拌;优化后转炉冶炼有较大幅度的改善,转炉终点命中率提高,碳氧积更稳定,达到了强化转炉冶炼的目的。     

在顶底复吹转炉中底吹喷嘴布置对熔池搅拌的影响

通过测量熔池的混合时间,采用物理模型研究了底吹喷嘴布置形式对顶底复吹转炉熔池搅拌的影响。结果表明：与对称的底吹喷嘴布置形式相比,由于不对称的底吹喷嘴具有更好的熔池搅拌作用,因此不对称底吹喷嘴布置能够缩短熔池混合时间。在非对称的底吹喷嘴布局中,由于顶吹高速气流导致的熔池振荡将会恶化熔池搅拌并且延长熔池混合时间。实际生产数据表明：在非对称底吹喷嘴布置的转炉中,其冶金效果更好,平均终点氧含量减少160ppm,终点碳氧平衡值从0．0031减少到0．0025,渣中平均终点（TFe）e含量减少了2．21％,出钢锰含量增加了0．029％。     

复吹转炉钢-渣间容量传质系数的水-油模型

在熔池直径880mm、深258mm的冷态模型中，利用水模拟钢水、机油模拟渣、苯甲酸模拟钢-渣间传输物质来研究熔池直径5285mm、深1545mm的复吹转炉吹炼工艺参数对钢-渣间容量传质系数的影响。结果表明，枪位350mm，顶吹流量117m^3/h，底吹流量1．68m^3/h至2．36m^3/h时，传输物质苯甲酸的容量传质系数变化最显著，在采用枪位350mm，顶吹流量140m^3/h，底吹流量1．68m^3/h，底枪布置方式为8孔对称布置在0．66直径的圆上时，传输物质的容量传质系数最大。     

300t 顶底复吹转炉氧枪枪位的水模型研究和应用

研究了300t顶底复吹转炉1:10几何相似比的水模型顶枪枪位（150~230mm）和流量（44~48m³/h）对钢液混匀时间的影响。模拟结果得出,最佳枪位为170mm,最佳流量为45m³/h。钢厂300t顶底复吹转炉应用结果表明,顶吹流量60000m³/h和底吹流量1000m³/h时,当顶枪枪位由1900mm改进为1700mm时,碳氧积平均值由原来的27.94降为23.49,提高了转炉内熔池的搅拌效果,吹炼时间由原15.8min降低至15.5min,降低了生产成本。     

复吹转炉熔池内流体流动的数值模拟

建立了描述复吹转炉熔池内流体流动的数学模型，采用PHOENTCS （Parabolic Hyperbolic、Or Elliptic，Numerical Integration Codes Seties)商用软件模拟计算分析了底吹、顶吹、顶底复吹等不同工况下熔池内气体的流动状况和速度分布，喷吹气体对熔池的搅拌混匀作用，得出转炉采取顶底复吹工艺时。底吹喷枪的合理布置位置应在熔池直径的(0．5～0．7)倍圆周上。     

300 t复吹转炉底吹系统优化模拟

 顶底复合吹炼转炉炼钢法是当下主流的炼钢方法,底部供气元件的种类、支数、排布方式和底吹供气强度直接影响着转炉熔池的混匀效果,合理的流场不仅可以降低生产成本,更能缩短冶炼周期,增加企业效益。基于冷态水模拟以及CFD数值模拟手段各自的研究特点,以某钢厂300 t转炉为原型,将不同底吹条件下熔池的混匀时间、死区以及弱流区体积作为评判依据,对300 t转炉的底枪排布方式、底吹供气模式(非均匀供气和均匀供气)以及底吹供气强度进行了系统研究,研究结果表明,当底枪排布位置由0.3D(D为炉底直径)到0.5D,底吹系统对炉壁处钢液的搅拌能力明显增强,但熔池内死区以及弱流区体积却会明显增加,使得整个熔池混匀时间增长;在对适宜底吹强度研究发现,当熔池底吹强度的临界值为0.28 m3/(t·min),此底吹强度下对熔池的搅拌效果最好;底吹系统对熔池的搅拌效果会随着供气模式的不同而改变,当底吹流量分配为2:1时,底吹系统对熔池的搅拌效果最佳,均匀供气模式(1:1)次之,而当分配比为3:1和4:1时,由于熔池的大流量侧供气强度相对较大,会极大影响底吹系统对熔池的搅拌效果。     

复吹转炉底吹氧气和石灰粉水模拟

 为了考察复吹转炉底吹氧气和石灰粉过程中的熔池特性,建立复吹转炉底吹喷石灰粉的水模型,用水模拟铁水,用空心玻璃微珠模拟石灰粉。利用图像处理法研究了底吹氧气和石灰粉时粉剂分布情况及熔池搅拌情况。采用熔池电导率法考察了相同条件下底吹喷粉与不喷粉时的混匀时间。研究结果表明,喷粉能够促进熔池搅拌,且粉剂扩散速度随底吹载气流量增大而增大;未喷粉时,混匀时间随载气流量增大而减小;在相同底吹载气流量条件下,喷粉时熔池的混匀时间明显低于未喷粉时的混匀时间,且在试验范围内,混匀时间在底吹载气流量为2 m3/h(标准态)时出现极小值。     

转炉预直炼法脱磷期亚音速顶吹的物理模拟

在1∶6物理模型上,通过水模型实验,对梅钢复吹转炉亚音速喷吹条件下的熔池搅拌情况进行了研究。结果表明,亚音速喷吹条件下的熔池均混时间明显长于超音速的。在亚音速喷吹条件下降低枪位、增加顶底吹气体流量可降低均混时间;A2底吹为本实验最佳布置方式,A6为适合预直炼的布置方式。     

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.