转炉副枪测量与成分预报技术

梅钢炼钢厂采用贺利氏副枪新技术和自主开发成分预报模型相结合的办法,对转炉冶炼过程进行控制.结果表明,过程碳、终点碳含量的预测精度提高,误差分别降低到0.023 %和0.006 %,同时也使转炉模型预测终点磷含量精度的准确性提高到96.47 %.     

利用人工神经网络系统提高转炉终点碳温双命中率

以神经网络为基础开发出一套转炉冶炼终点控制模型。模型以转炉炼钢基础理论为依据,采用误差后向传播网络——BP网络为原形,对其算法进行改进,建立两个三层BP预测神经网络,选用29个输入参数,分别对终点温度和终点碳含量进行预报。通过采集现场操作数据和实际应用,碳温双命中率达到80%以上。     

迁钢转炉复吹的进步

介绍了迁钢转炉复吹的发展历程,并对迁钢新开发的转炉全炉役底吹稳定控制技术（SEBC）进行了介绍。采用该技术后,解决了低底吹搅拌强度下的转炉底吹效果难以稳定控制的难题,实现了转炉全炉役碳氧积稳定控制,平均碳氧积不高于0.002 0,即使在炉龄6 000炉次以后,碳氧积依旧能够保持稳定控制。以1号转炉为例,转炉复吹效果的提高和稳定带来转炉溅渣成本降低31.83%,转炉补炉料成本降低38.28%,转炉脱磷率由85%提高到87%,终渣TFe质量分数由17.29%降低到15.60%,溅渣时间缩短45 s,氧活度降低1.64×10-4。     

莱钢顶底复吹转炉碳氧积稳定控制技术研究

通过改进底吹透气砖工艺设计、开发新型转炉溅渣工艺、优化转炉智能炼钢及底吹模型等,实现复吹转炉碳氧积的降低并稳定控制在较低水平;利用激光测厚仪对炉型进行监控,确保炉型稳定,防止碳氧积波动;利用静止脱碳技术进一步降低碳氧积。工艺实施后,1~#~3~#120 t转炉碳氧积控制在0.002 5,4~#脱磷炉碳氧积控制在0.002 3;4座转炉终渣平均全铁含量由14.38%降为12.83%,吹炼终点钢水氧含量平均由520×10~(-6)降为450×10~(-6),长寿转炉碳氧积稳定控制技术年直接经济效益2 390.04万元。     

在150 t转炉上用质谱仪进行钢水连续定碳

介绍了本溪板材股份有限公司150t转炉引进的国内第一套转炉炉气分析系统，并对利用质谱仪进行钢水连续定碳进行了研究。结果表明：质谱仪得出的炉气成分中C0、C02和N2在吹炼周期中的变化规律对判断转炉冶炼终点有指导意义；作者开发的碳积分模型和碳指数模型可在转炉冶炼全程控制中配合使用，对终点碳含量低于0．10％的炉次，碳指数模型的命中率较好。     

基于炉口火焰多光谱分析技术预报转炉终点碳的研究

利用多光谱复合分析技术,设计开发了远距离、非接触式转炉炉口火焰碳谱线分析技术和装置,预报转炉熔池钢液碳含量。该技术通过分析转炉主吹过程炉口火焰碳谱线的变化规律,找出了炉口火焰多光谱光强分布图样与转炉熔池钢液碳含量的对应关系,建立了转炉冶炼过程熔池碳含量的实时预报模型。该装置在某钢厂70t转炉上进行了试验,按照终点[C]≤0.05%±0.02%、0.05%~0.15%±0.03%和0.15%±0.05%三个范围内预报精度,预报命中率分别为83.8%、80.1%和85.6%,研究表明,转炉冶炼过程的装入制度、造渣制度以及供氧制度对终点碳预报基本没有影响。     

基于神经网络的转炉控制模型

以理论模型为基础，建立了转炉炼钢控制模型，并将人工神经网络模型应用到转炉控制中。通过计算，得出了铁水中Si含量与转炉炉渣碱度的关系；通过BP神经网络预报了终点的碳含量，当碳命中误差〈0.02％时，命中率达到了66.7％。     

超低碳钢转炉冶炼终点控制技术

通过对转炉冶炼终点碳、磷、铁选择性氧化平衡点的计算,得出超低碳钢冶炼终点碳含量的最佳控制范围是0.040%~0.060%,基于此范围开发了转炉冶炼的静态模型及动态模型,从而形成超低碳钢冶炼终点的控制技术,实践表明,采用该技术可大幅度提高冶炼终点钢水温度和磷成分的命中率,降低补吹率及罐内氧含量。     

基于副枪控制的转炉终点预测模型

利用转炉吹炼末期脱碳指数方程、热平衡和热力学方程分别建立了转炉终点碳、温度、磷和锰的预报模型.终点碳质量分数预报误差为±0.015%的命中率达到87.6%;转炉终点目标w(C)=0.03%时,温度误差范围±10 ℃的比率为85.4%;模型预报钢中w(Mn)误差在±0.02%、w(P) 误差在±0.003%范围的比率分别达到了87.0%和81.2%.建立的预报模型具有较高的精度,实现了转炉终点碳、温度、残锰和磷的同时预报,为提高转炉的终点控制命中率、减少补吹的次数、实现直接出钢打下良好的基础.     

音频化渣技术在150 t复吹转炉上的开发与应用

在唐钢150 t复吹转炉上开发出适用于百吨以上顶底复吹转炉的音频化渣技术,并根据音频曲线实现了转炉吹炼操作的量化分级管理。该技术的开发与应用,有效控制了转炉吹炼过程的喷溅和返干,改善了冶炼过程的化渣效果,一次拉碳率从45%提高到66%,冶炼周期从41.45 min缩短到37.31 min,冶炼技术水平明显提高。     

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.