用钡合金对齿轮钢脱氧的工艺研究

为提高钢的洁净度,在50t EAF-60 t LF流程中采用钡合金对齿轮钢进行脱氧试验,通过控制电炉出钢碳含量、充分地铝预脱氧并用钡合金进行终脱氧和夹杂物变性,可使铬铝系SCM822H齿轮钢的氧含量降至0．0015％以下。     

优化EAF—LF—CC工艺降低钢中氧含量

通过采用控制出钢终点碳和预脱氧，加强精炼脱氧和出钢软吹，做好保护浇注等措施，降低了钢中氧含量。     

转炉冶炼低碳低硅钢的生产实践

通过测量 1 2 0t氧气顶吹转炉终点、钢包钢水氧含量 ,回归出转炉终点碳、氧方程及脱氧合金化时脱氧剂加入量与脱氧量方程 ,经分析 ,得出终点钢水氧含量主要由碳含量控制 ,钢水温度影响不大 ;冶炼低碳低硅钢时 ,钢中氧含量控制在 2 0× 1 0 -6 ～ 6 0× 1 0 -6 (质量百分数 ) ,可保证浇注顺行 ,铸坯不产生气泡。     

含钡合金对硬线钢的脱氧试验

用 2 5 0kg感应炉对 0 .81%～ 0 .84 %C硬线钢进行了脱氧试验。试验用含钡合金为SiAlBa和SiAlBaCaSr ,并与Al和FeSiAl脱氧效果进行对比。试验发现 ,SiAlBaCaSr合金对硬线钢的脱氧效果优于SiAlBa、Al和FeSiAl脱氧剂 ,氧含量可达 2 0× 10 - 6 ,脱氧产物易于上浮且速度快 ,钢中夹杂物基本呈球形且分布均匀。     

炼钢厂150t转炉出钢过程脱氧工艺研究

在对脱氧理论进行再认识的基础上,通过对复合扩散脱氧剂在梅钢炼钢厂150 t转炉出钢脱氧工艺试验,开发了新的转炉出钢过程脱氧工艺,可以显著降低成本和改善脱氧效果,对炼钢厂炼钢生产具有重要意义。     

300t转炉出钢过程碳脱氧试验研究

针对300吨转炉生产低碳铝镇静钢出钢脱氧铝耗过大的问题,充分利用出钢过程良好的动力学条件,优化碳粉、合金及渣料加入时机和顺序,采用出钢过程投入碳粉对钢水进行预脱氧工艺。生产数据表明,使用碳粉脱氧工艺,钢水增碳微弱,仅为0.001%-0.002%,出钢过程未增加温度损失,吨钢铝耗由2.11 Kg下降至1.97 Kg,吨钢生产成本约降低1.68元,达到了降低脱氧铝耗及降低生产成本的目的。     

Q345精炼过程中非金属夹杂物生成热力学及工业实践

Q345钢采用铝硅锰复合脱氧,在LF精炼过程中,钢—渣—夹杂物—耐火材料—合金—空气多元体系下夹杂物成分会发生转变。由于纯铁液脱氧热力学不能指导工业生产实践,且目前实际钢液的脱氧热力学没有系统化,需要进行深入研究。结合Factsage7. 0热力学计算,分析了Q345钢LF精炼脱氧、耐材侵蚀、钙处理等引起的钢液[Al]、[Si]、[Mg]、[Ca]含量变化对夹杂物成分的影响。转炉出钢采用铝硅锰复合脱氧,脱氧产物主要为Al2O3,随着钢中[Mg]含量上升,夹杂物由Al2O3转变为MgO·Al2O3尖晶石。钙处理会将夹杂物由MgO·Al2O3尖晶石转变为液态Ca-Al-Mg氧化物,但当喂钙过量时,夹杂物中CaO含量偏高,会影响夹杂物改性效果。利用Factsage7. 0热力学软件分析出的夹杂物成分与直接检测结果一致。     

帘线钢冶炼过程夹杂物转变的控制

研究的帘线钢的冶炼流程为150 tLD-RH-LF-软吹氩-CC工艺。通过LD出钢时加入Si-Mn脱氧,并在LF加入低碱度顶渣进行钢渣反应控制钢中非金属夹杂物的塑性。结果表明,RH-LF-中间包和铸坯阶段,钢中主要夹杂物分别为MnO-Al₂O₃-Si0₂(RH),Ca0-Al₂O₃-Si0₂(LF)和MnO-Al₂O₃-SiO₂(中间包和铸坯),采用Si-Mn脱氧和SiC扩散脱氧,低碱度低Al₂O₃顶渣精炼,控制T[O]≤20×10-6,[A1]s≤0.0013%,可有效控制钢中夹杂物数量和尺寸,以及控制夹杂物中Al₂O₃含量并形成可塑性夹杂。     

含Ba合金脱氧及脱氧产物特性研究

研究Ca-Si-Ba和Ca-Si-Ba-Mg合金的钢液脱氧，观察分析合Ba合金脱氧产物组成、形貌的实验结果表明，钢液用0.36?-Si 0．5?-Mn预脱氧后，采用两种含Ba合金脱氧能将钢液中溶解氧降至10ppm左右，脱氧产物为含钡量高的硅酸盐、硅铝酸盐和几乎不含Ba的硅铝酸盐。     

氧气转炉出钢温度的最佳化

一、前言氧气转炉出钢温度是一个重要的综合性指标,它显著影响炼钢生产的能源消耗。影响出钢温度的因素有:①未脱氧的钢液;②钢包的温度;③出钢的方式和时间以及脱氧和合金化的物理化学参数。出钢时钢包内钢液的热容量、炉外精炼和浇铸过程都对钢液温度有影响。     

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.