超低碳IF钢RH真空脱碳工艺优化

根据鞍钢股份有限公司鲅鱼圈钢铁分公司超低碳钢的生产实践,结合超低碳IF钢在RH-TB真空处理过程中的脱碳机理,分析了钢水温降、吹氧升温参数、钢包底吹氩流量和钢水取样器等工艺因素对RH精炼钢水脱碳效果的影响。实践表明,采取控制出钢温度、优化吹氧参数、RH处理过程钢包底吹氩和改进取样器措施后,RH-TB精炼时间缩短了5 min,精炼结束钢水碳含量0.002 0%以下的比例由71%提高至95%。     

RH精炼脱氧过程铝含量预报模型

在河北钢铁集团唐钢公司RH生产实绩的基础上,采用多元线性回归的计算方法,建立了RH精炼铝脱氧过程钢水溶解铝含量的预报模型.模型计算结果表明,RH脱碳结束后钢水中的溶解氧含量越高,脱氧后钢水中的溶解铝含量越低;适当高的钢水温度有利于提高钢水溶解铝含量;随钢水脱氧加铝量的提高,钢水中的溶解铝含量逐渐增大.钢水溶解铝含量的实测值基本围绕着预报值波动,模型较好地预测了河北钢铁集团唐钢公司RH精炼铝脱氧后钢水中的溶解铝含量,研究开发的模型可信.     

RH-MFB二次精炼过程钢水温度控制的模拟

RH-MFB二次精炼过程钢包钢水传热行为和钢水温度的变化规律,建立钢水温度预报模型,编制了计算机软件对实际过程进行模拟。通过对9炉300 t钢水RH-MFB精炼时钢水温度的预测结果表 明,钢水温度的计算值和实测值的误差小于±10℃。按目标温度要求,进行补偿措施,有效地控制钢水温度     

RH精炼温度与合金模型的开发与应用

根据RH精炼处理对过程控制的要求，建立了RH温度与合金最小成本模型。该模型具有以下功能：（1）实时计算钢水温度的不断变化，并预报未来时刻钢水的温度；（2）计算达到目标成分需要投入的合金组合、合金数量。该模型在宝钢2号RH得到成功应用。     

用多功能喷枪进行钢水脱硫试验

据报导，对钢水进行二次精炼的RH脱硫精炼法有：把脱硫剂从钢包钢水内的浸渍管下部吹入的方式、从真空槽下部的水口吹入钢水中的方式和从真空槽顶部插入喷枪向钢水表面喷吹的方式等。在所有的这些方式中，由于供给钢水脱硫剂的溶解热，会使钢水温度降低，例如，脱硫剂的消耗为5kg／t时，钢水温度约降低10℃。     

马钢CSP流程RH精炼钢水温度预测模型

基于冶金机理和传热学计算,分析研究了RH精炼过程中脱碳、吹氧加铝、脱氧、合金化、喷粉、真空室状态以及钢包等级等各类因素对钢水温度的影响。结合现场实际生产数据,建立了RH精炼钢水温度预测模型,经过对实际生产跟踪验证表明,模型预测的钢水终点温度与实测值偏差在±5 ℃以内的命中率为87.42%,偏差在±8 ℃以内的命中率为100%。     

韶钢120 t LF钢水温度预报模型的开发

以钢厂120 t LF精炼过程钢水、炉渣和合金为研究体系,以能量平衡机理模型为基础,建立精炼钢水温度预报模型。根据钢种、钢水质量和温度、目标出钢温度及处理时间、渣料和合金加入量及各种热损失所需投入的电能,确定精炼过程合理的供电曲线。并根据现场供电和工艺参数,预报钢水温度。20炉50RH1钢(%:0.48～0.50C、0.22～0.30Si、0.60～0.70Mn)测试结果表明,模型预报与实测钢水温度误差为±5℃。     

连铸过程钢水温度预测模型的开发与应用

开发了从钢包精炼结束到中间包连续铸造结束全过程中关于时间—钢水质量—感应加热功率—钢水温度变化的非稳态过程数学模型。计算后发现,与特定薄带连铸工艺相配套较合适的钢包吨位应控制在90 t左右,若钢包容量达到130 t,建议配备1 500 kW中间包感应加热装置。通过对比宁钢薄带连铸(简称NBS)中间包钢水温度的实测值与预报值可以看出,该模型的预报精度能够满足大生产过程中对中间包内钢水温度的预报精度要求。同时发现,中间包在各个面上的热流密度约在50 min时与相关文献报道的数值完全一致,在浇铸试验时间段内中间包尚未达到热平衡。     

基于钢包底吹氩的RH真空处理过程中钢水行为及夹杂物分析

钢包底吹氩对钢水的运动、氩气泡在钢水中的迁移及夹杂物去除有重要影响。基于Fluent模拟软件建立了RH真空处理过程中钢包底吹氩的数值计算模型,对RH真空处理过程进行模拟分析,并对此模式下的钢水夹杂物尺寸及分布进行了取样分析。结果表明,RH真空处理过程中钢包底吹氩能有效增加钢包内钢水的流动速度,并减少钢包内部死区占比,同时,在一定程度上促进夹杂物的长大和上浮。另外,过大的钢包底吹氩气流量不但无法促使长大的夹杂物上浮被吸附,甚至还会导致钢水被二次污染。数值模拟及现场取样分析表明,RH真空处理过程中需采用适当的氩气流量钢包底吹氩操作,同等条件下,流量取值以5 m³/h为宜。     

弓形浸渍管RH混合传质均匀性的数值模拟

为了提高RH系统真空精炼的效率,采用了一种新型弓形浸渍管RH装置.通过欧拉-欧拉方法对弓形浸渍管RH装置进行了数值模拟,计算了循环流量、均混时间、真空室液面流速分布、真空室内传质均匀性、真空室内RTD和钢包内RTD,并与传统RH进行对比.结果表明,在实际生产条件下,弓形管RH的循环流量比传统RH增加了91％～99％,均...     

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.