大型转炉吹炼过程中熔池温度的状况

为了了解大型转炉吹炼过程中熔池温度的变化规律，利用副枪在转炉吹炼过程中进行了测温和取样分析。结果表明：吹炼初期熔池升温速度很低，平均仅为3．6℃／min，吹炼中期为23．5℃／min，吹炼后期可达28．8℃／min。吹炼过程中，熔池金属过热度应在60℃～120℃范围内；终点钢水过热度由所炼钢种的要求而定。宝山钢铁集团公司300t转炉炼钢的热支出为1935．33MJ／吨钢，热效率为46．07％。     

大型转炉炼钢脱硫的研究

用副枪取样方法研究了宝钢一炼钢300t转炉吹炼过程中熔池脱硫反应的情况，用Belaf程序计算了吹炼科点渣钢之间脱硫反应的平衡值。转炉终渣硫含量平均占炉料中总硫量的31％，气化脱硫作用很微小。     

转炉氧枪顶吹工艺的水力学模拟

根据鞍钢180t氧气转炉生产情况，进行氧气顶吹转炉1／15模型的水力学模拟实验，以得出吹炼工艺参数对熔池的影响。结果表明，当模型顶吹气体流量≥15．5m^3／h时，枪位和流量变化对熔池均混时间影响较小；熔池的喷溅量随枪位降低和顶吹气体流量的增加而增加；当气体流量为16．0m^3／h时，熔池的喷溅量较大。     

宝钢转炉少渣炼钢的实践

叙述了宝钢300t转炉少渣炼钢工业性试验及少渣条件下锰矿还原的试验结果。试验结果表明：转炉生石灰单耗达到11．3kg／t，轻烧白云石单耗达到6．3kg／t，锰矿加入量大于8kg／t，平均锰回收率达到50％以上。此外，分析了转炉少渣吹炼的冶金效果和工艺制度。     

铁矿石替代部分废钢冶炼工艺的生产实践

针对马钢65 t转炉加入铁矿石替代部分废钢后冶炼操作和炼钢成本发生变化,通过测算铁矿石与废钢的冷却效应,得出1 kg铁矿石冷却效应为3.76 kg废钢的冷却效应。在此基础上,分别研究了铁矿石加入量对转炉吹炼的影响,以及熔池温度和铁矿石密度对铁矿石还原率的影响。结果表明：熔池温度在1550℃时,铁矿石还原率达到最大值65.23%,铁矿石加料时机应选择在吹炼中前期加入;铁矿石密度越小,越有利于铁矿石还原,合理的铁矿石密度范围为3.0～4.0 g·cm^-3。通过控制铁矿石加入量和加入时机,以及优化转炉冶炼过程操作,提高了吹炼的平稳性,铁矿石用量由7.46 kg/t提高至17.91 kg/t,转炉终渣主要成分变化不大,终点磷含量符合内控要求,转炉炉况未见明显侵蚀,实现了转炉炼钢降本增效目标。     

提高转炉日历利用系数的系统工艺技术研究

通过实施低过热度浇注技术,大幅度降低出钢温度,实施钢包在线快速烘烤,减少出钢过程温度损失;优化氧枪喷头工作参数,改善综合吹炼指标;对转炉采取综合技术管理措施,提高转炉炉龄,济钢一炼钢转炉日历利用系数由２９．０９ｔ／公称ｔ．ｄ提高到６９．７９ｔ／公称ｔ．ｄ,转炉作业率由６３．６１％提高到９１．０５％,满足了全连铸的要求。     

沙钢180t转炉自动炼钢控制工艺的建立与实践

以副枪系统和二级冶金模型为基础,通过优化原材料条件,建立转炉加料、底吹搅拌和供氧等吹炼过程自动控制工艺,以及优化系统操作参数和模型参数等措施,实现了180t转炉自动化炼钢,转炉出钢命中率由25%提高到83%以上,且吹炼过程稳定,转炉生产周期缩短了4min,终渣全铁质量分数平均降低了2.4%,提高了转炉炼钢的金属收得率。     

邯宝大型转炉炼钢工艺优化的研究

为了解决邯郸钢铁公司邯宝钢厂260 t转炉炼钢吹炼前期脱磷率低、终点钢中氧含量高、出钢温度偏低和枪龄短等问题,对炼钢过程进行了取样、测温,记录和分析关键操作参数等一系列调研。根据调研结果优化了氧枪喷头参数和吹炼枪位曲线,加强透气砖维护,测量了氧气管道压力损失和喷头射流流场特性,进行了射流与熔池作用的水模试验。采用上述工艺优化措施后,转炉脱磷效果得到改善,终点钢中碳氧积降低到0.002 39,平均出钢温度1 645℃,平均枪龄提高1倍,达到320炉。其他如钢铁料和石灰消耗也都有明显改善,增加废钢用量,所取得的经济效益达到39.8元/t。转炉炼钢工艺达到生产低碳优质深冲钢所需的技术水平。     

扩容转炉复吹工艺试验研究

本文论述了武钢二炼钢厂转炉扩容装入量88t试验的复吹工艺制度,分析了吹炼过程熔池金属和炉渣的变化。试验结果表明:吹炼终点冶金效果良好,平均每炉纯供氧时间比原装入量80t生产时缩短约1min。     

宝钢转炉复合吹炼脱碳模型系数的探讨

一引言转炉炼钢数学模型的核心组成之一是脱碳模型,近几年来,随着转炉吹炼工艺的发展,国内外的转炉普遍采用了顶底复合吹炼技术,其主要特点就是通过加强熔池的搅拌,改善了转炉冶金反应的条件,特别是对贯穿于炼钢过程始终的脱碳反应,由于底吹气体促进了熔池中碳元素的传递,改善了脱碳反应的动力学条件,从而提高了脱碳效率,     

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.