铁水预处理镁系脱硫渣流动性能调控研究

镁系脱硫剂与硫的亲和力强，脱硫效率高，是铁水预处理脱硫过程常用的脱硫剂之一，但脱硫后的渣具有渣稀、不易扒渣等特点。为了改善脱硫渣的流动性、增加界面的粘接力、降低扒渣铁损，研究了脱硫渣改性剂碱度和添加量对脱硫渣黏度的影响。首先采用FactSage热力学软件对不同碱度和FeO加入量的脱硫渣黏度进行了模拟计算，分析了碱度和FeO加入量对脱硫渣黏度的影响。然后通过绘制CaO-SiO₂-Al₂O₃-MgO(10%)-FeO(11%)脱硫渣的等温液相线图，找到了脱硫渣扒渣难的原因。利用熔渣综合物性测定仪测定了加入脱硫渣改性剂前后熔渣的黏度。结果表明：未加入脱硫渣改性剂之前脱硫渣的黏度均偏低，达不到合适的扒渣黏度；加入脱硫渣改性剂后可以增大脱硫渣的黏度，适宜的脱硫渣改性剂添加量为脱硫渣改性剂与脱硫渣配比为2∶5、3∶5,此时在扒渣温度区间1 330～1 340℃,脱硫渣黏度在2.007～2.114、2.5～2.77 Pa·s,有利于脱硫渣的粘结。     

120 t转炉冶炼无取向硅钢脱硫技术研究

结合冶炼无取向硅钢的生产实际,对钢中硫的来源,以及炉渣性质、钢水温度、底吹强度对脱硫的影响进行了分析.研究表明,转炉钢中硫的主要来源为铁水、废钢、铁水渣及石灰带入;冶炼硅钢时,终渣碱度为3.0～3.5,w((FeO))≤20%,终点钢水温度大于等于1680℃,加大底吹搅拌强度能提高转炉脱硫效果.硅钢平均出钢硫的质量分数...     

60 t AOD炉铁水脱硫的工艺实践

参照AOD炉冶炼不锈钢的工艺模式,开发AOD炉进行铁水脱硫的工艺,以满足脱硫设备出现故障后脱硫铁水的供应。通过实践表明:AOD炉进行铁水脱硫可实现将w(S)脱至0.002 0%以下,并利用离线扒渣设备扒除含硫渣,防止转炉冶炼过程中回硫;为提高脱硫效率,铁水脱硫终点温度控制在1 350～1 400℃,温度不足采用硅铁弥补,渣量20～30 kg/t,还原后w(Si)控制在0.2%～0.4%,还原阶段侧吹搅拌强度控制在0.4～0.6 m~3/(t·min),搅拌时间5 min。     

CaO-SiO_2-Al_2O_3-Na_2O-TiO_2渣铁水脱硫动力学

为了研究炉渣铁水脱硫速率,在实验室条件下进行了温度为1 673～1 773 K时CaO-SiO_2-Al_2O_3-Na_2O-TiO_2渣铁水脱硫的动力学试验。结果表明,随着温度的增加,脱硫速率加快,炉渣熔化效果更好。多数脱硫反应在约50 min后硫质量分数基本不变。通过建立铁水脱硫动力学的数学模型,计算脱硫过程中硫的传质系数和传质阻力。硫的传质系数范围为5.02×10-7～18.69×10-7m/s。温度为1 673～1 723 K时活化能为464.06 kJ/mol,温度为1 723～1 773 K时活化能为176.35 k J/mol。通过矿相解离分析仪(MLA)观察硫在渣铁界面附近的分布情况,结合MLA扫描图片,认为高温时硫在渣中的传质是脱硫过程的限制环节。     

CaO-SiO2-MgO-Al2O3-BaO渣系脱硫能力研究

为了探究温度、碱度（R）、MgO质量分数和BaO质量分数对高炉渣脱硫能力影响,以酒钢现场高炉渣实际成分为基准,选取分析纯化学试剂配制实验渣样,采用双层石墨坩埚法研究了含钡渣系的脱硫能力,并考察BaO对脱硫动力学条件的影响。研究结果表明,增大高炉渣碱度,提高渣中MgO质量分数均能使硫分配比增加,炉渣脱硫能力增强。渣中BaO质量分数由0增加到4%,硫分配比先逐渐升高后略有降低,BaO质量分数为35%左右时硫分配比达到最大值。BaO质量分数增加使得熔渣中硫的传质系数增大,脱硫速率明显提升。     

CaO-SiO_2-MgO-Al_2O_3-BaO渣系脱硫能力研究

为了探究温度、碱度(R)、MgO和BaO的质量分数对高炉渣脱硫能力影响,以酒钢现场高炉渣实际成分为基准,选取分析纯化学试剂配制实验渣样,采用双层石墨坩埚法研究了含钡渣系的脱硫能力,并考察BaO对脱硫动力学条件的影响。研究结果表明,增大高炉渣碱度,提高渣中MgO的质量分数均能使硫分配比增加,炉渣脱硫能力增强。渣中BaO的质量分数由0增加到4%,硫分配比先逐渐升高后略有降低,BaO的质量分数为3.5%左右时硫分配比达到最大值。BaO的质量分数增加使得熔渣中硫的传质系数增大,脱硫速率明显提升。     

邯钢三炼钢脱硫铁水冶炼过程回硫分析

通过对脱硫铁水在转炉冶炼过程中回硫的各种因素进行分析,得出影响回硫的主要原因是铁水包硫的不稳定、转炉留渣、终渣碱度以及铁水残渣等,提出了冶炼低硫钢减少回硫的主要措施.     

高铝中钛高炉渣脱硫的动力学机制

 以现场高炉渣化学成分为基准,利用纯化学试剂制备试验渣样,研究了高铝中钛型高炉渣脱硫的动力学过程,确定了其脱硫的动力学参数。结果表明,当反应温度一定时,铁水中硫含量w(［S］)随脱硫反应时间的延长而降低。试验条件下,高铝中钛渣脱硫过程属于二级反应,其限制性环节是硫在熔渣中的扩散。熔渣中硫的传质系数βS随着温度的升高而增大,硫在熔渣中的扩散活化能ED为127.03kJ/mol。     

碱性化鉄爐高效率脫硫的經驗

在碱性化铁爐操作上注意造高碱度渣、保持渣子流动性良好,降低渣中氧化铁含量,可以获得高脱硫效率。含硫达0.3～0.7％的生铁,经化铁爐爐内脱硫,可使铁水含硫量降到0.025～0.06％,脱硫率为85～90％,给转爐减轻了去硫负担。     

硅钢铁水预处理脱硫工艺实践

结合脱硫理论和实际生产数据分析,对某厂硅钢铁水预处理脱硫进行了研究。结果表明,二次脱硫渣硫含量与前渣中的硫含量成正比、与前渣余量成反比、与一次脱硫渣余量成正比、与脱硫剂用量成反比。当脱硫剂总量一定时,二次脱硫渣中硫含量随着一次脱硫剂占比的增加呈先降后增的趋势,最佳一次脱硫剂占比为40%。铁水随着预处理前温度的升高,处理后的硫含量呈先降再升的趋势,最佳处理前温度为1 370～1 400℃。铁水通过3次扒渣,2次脱硫处理,硫的质量分数降至11.7×10^-6,满足硅钢生产需求。     

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.