180t复吹转炉单渣法深脱磷工艺的研究

通过研究180 t复吹转炉单渣深脱磷工艺,确定实际铁水条件下吹炼制度、造渣制度、温度制度等影响转炉脱磷效果的关键控制参数,并通过优化出钢模式、采用低磷合金及顶渣改质等控制回磷措施,实现了复吹转炉单渣法出钢平均ω[P]为0.007 9%,成品平均ω[P]为0.008 4%的目标。     

180t复吹转炉单渣法冶炼低磷钢SPHD工艺实践

通过研究宁钢180 t复吹转炉单渣深脱磷工艺,根据实际铁水条件,确定转炉吹炼制度、造渣制度、温度制度等方面影响转炉脱磷效果的关键工艺参数,并优化出钢模式,将转炉冶炼SPHD钢的出钢磷含量稳定控制在150×10-6以下。     

鞍钢转炉双渣深脱磷工艺研究与实践

 在100t顶吹、180t复吹及260t复吹转炉上研究了双渣法深脱磷规律。通过工业性试验,研究不同吹炼时期冶炼特点,分析吹炼过程需要控制的原料及工艺制度等关键措施,研究结果表明：控制倒炉温度、碱度、渣中w（(FeO)）及熔渣流动性等因素均是取得良好脱磷效果的重要保证。应用双渣法深脱磷生产试验取得了100t顶吹转炉出钢w（［P］）平均达到63×10-6,180t复吹转炉w（［P］）达到51×10-6,260t复吹转炉w（［P］）达到62×10-6的实绩。     

复吹转炉脱磷预处理工业试验

通过对首钢京唐钢铁联合有限责任公司300 t转炉脱磷现场工业试验,研究了复吹转炉脱磷预处理过程中半钢温度、炉渣氧化性、脱磷渣碱度、半钢w(C)/w(P)对脱磷效果的影响,研究表明:在半钢温度和脱磷渣碱度分别控制在1 290~1 310℃和1.9~2.5的条件下,半钢终点平均w(P)=0.026%,且w(P)0.030%的比例能够达到81.01%,与优化前相比,半钢平均磷含量和磷合格率都有明显改善。     

260 t转炉冶炼极低磷钢的生产实践

结合复吹转炉脱磷原理,针对鞍钢股份有限公司鲅鱼圈分公司炼钢部铁水平均w(P)高达0.12%的现状,综合考虑设备布置等因素,自主开发了复吹转炉的两炉法(脱磷炉+脱碳炉)冶炼极低磷钢种技术。在应用实践中,通过优化脱磷炉和脱碳炉的两炉法脱磷工艺参数,实现了深脱磷的目的。脱磷炉脱磷率高达85%,半钢平均w(P)=0.018%;脱碳炉冶炼终点钢水平均w(P)=0.001 2%;成品钢中平均w(P)0.002 0%,实现了极低磷钢的批量稳定生产。     

“全三脱”铁水转炉少渣冶炼低氮钢生产实践

在首钢京唐钢铁联合有限责任公司"全三脱"铁水少渣冶炼工艺过程中,通过生产历史数据对影响钢水氮含量因素进行分析,结果表明:转炉顶枪漏氮对钢水增氮有很大影响;采用硅铁作为提温剂可以有效控制钢水w(N)在12×10-6左右;脱碳转炉采用全程底吹氩钢水w(N)可以降低3.3×10-6;转炉熔池内w(C)=0.3%~0.4%时,加入矿石可有效降低钢水氮含量;转炉后吹以及出钢时间越长,钢中氮含量越高;采取优化措施后,脱碳转炉出钢后,可稳定控制钢包内钢水w(N)≤15×10-6,达到了冶炼低氮钢的控制要求。     

50 t转炉单渣法一倒渣冶金特性对脱磷的影响

为研究转炉高拉碳冶炼工艺过程中一倒渣的冶金特性对转炉脱磷冶金效果的影响,采用单渣法在国内某钢厂50 t顶底复吹转炉上开展单渣高拉碳高效脱磷工业试验。通过理论计算分析并结合实验室研究,对转炉一倒渣的矿相结构、熔化温度、黏度、成分等冶金特性与转炉脱磷效果之间的关系进行了研究。研究结果表明：一倒渣中Si、Ca、P富集的区域形成的矿相结构主要是2CaO·SiO₂和3CaO·P₂O₅,这两种矿相结构均有利于脱磷反应的进行;Fe、Mn、Mg元素富集的区域主要形成RO相和基体相,不利于脱磷反应的进行;降低单渣法高拉碳一倒渣的熔化温度和黏度有利于脱磷反应的进行;控制一倒渣的熔化温度在1 370～1 375℃,黏度在0.033 Pa·s左右,此时脱磷效果好,实现一倒钢液磷质量分数最低为0.018%,一倒渣的磷分配比L_P>60,一倒脱磷率最高为84%;炉渣二元碱度R=2.60～3.00,w(FeO)=22.00%～27.00%,w(MgO)<7.50%,w(MnO)<4.60%,一倒渣具有良好的脱磷效...     

120吨复吹转炉冶炼低磷钢的生产实践

介绍了湘钢采用120 t复吹转炉生产低磷钢的新工艺,转炉终渣碱度控制在3.5-4.5,出钢温度控制在1605-1625℃,出钢w(O)控制在0.065％以上,可将转炉终点w(P)控制在0.011％以下,也可保证出钢后进一步脱磷效果.采用新工艺生产低磷钢,出钢后平均脱磷率51.2％,扒渣后平均返磷率34.6％,中间包w(...     

单渣法转炉终渣理化性质对脱磷的影响研究

在转炉利用单渣法冶炼HRB500E钢种的过程中,转炉终渣的性质对终点钢液磷含量有着直接的影响。以单渣高拉碳低磷冶炼工艺生产HRB500E钢种得到的转炉终渣为研究对象,通过采用XRD、SEM、EDS及热力学软件Factsage8.1,结合高温熔点实验研究了转炉渣的矿相结构、熔化温度和黏度等理化性质对转炉脱磷的影响。研究结果表明：终渣中的硅酸二钙相和磷酸三钙相有利于脱磷反应的进行;终渣的黏度随着温度的升高而降低,降低终渣的黏度和熔化温度有利于脱磷反应的进行;将终渣碱度控制在2.8～2.9,w(FeO)控制在15.9%～18.3%,终渣的熔化温度控制在1 357℃以下,可以实现终点出钢w(P)<0.020%,终点脱磷率大于82%。     

100t复吹转炉高冷料比优化冶炼工艺实践

介绍三钢对100t复吹转炉的底吹工艺和脱磷工艺进行优化的实践.结果表明,在高冷料比条件下,转炉一倒钢水平均w(P)从0.047%下降到0.027%;平均w(Mn)从0.22%提高到0.25%;平均终渣w(TFe)下降3.26%;平均终点w(O)降低370×10-6;平均终点w(C)×w(O)积下降0.0007%.钢铁料消耗从1088kg/t下降到1082kg/t;合金加入量从10.2kg/t下降到9.4kg/t.     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.