铁水预处理工艺、设备及操作(续)

4　铁水预处理脱磷及同时脱磷脱硫工艺4.1　同时脱磷脱硫的化学原理铁水预处理同时脱磷脱硫可用电化学反应表示如下 :阳极 :[Ｐ] 4(Ｏ2 - ) (ＰＯ3-4 ) 5ｅ阴极 :[Ｓ] 2ｅ (Ｓ2 - )图 1是竹内秀次等[4] 在 1 0 0ｔ铁水包内用固体电解质测定的喷吹ＣａＯ系熔剂进行同时脱磷脱硫处理时铁水熔池的氧位分布。得出了喷吹法同时脱磷脱硫反应的实质 :在喷枪附近 ,氧位比较高 (ＰＯ2 =1 .0 1 3× 1 0 - 9Ｐａ～ 1 .0 1 3× 1 0 - 8Ｐａ) ,进行着氧化脱磷反应 ;在铁水罐壁和顶渣与铁水界面处 ,氧位比较低 (ＰＯ2 ≤ 1 .0 1 3× 1 0 - 1 0 Ｐａ) ,进…     

含铌铁水预处理脱硅保铌的研究

 为防止铁水预处理脱硅过程中脱铌,通过中频感应电炉底吹氧气冶炼含铌铁水,研究了铁水预处理吹氧过程中不加渣和加入造渣剂吹炼过程中脱硅保铌的行为及铁水中各元素含量的变化规律。试验结果表明：在铁水温度1623K加入碱度为4的CaO-SiO2-CaF2的造渣剂、供氧强度为0. 5m3/(t·min)时吹氧冶炼,铁水中的硅含量降低到0. 012%(质量分数,下同)时,铌才开始氧化,脱硫率为83%,磷含量不变;在相同的温度和供氧强度,不加造渣剂吹炼时,铁水中的硅降低至0. 16%时,铌开始氧化,硫和磷含量不变;有渣吹炼脱硅保铌终点硅含量是无渣吹炼脱硅保铌终点硅含量的10%,显著脱硫。     

含钒铁水多段组合式预处理工艺

 介绍一种将含钒铁水复合喷吹预脱硫、提钒过程脱硅钛及出半钢过程脱磷技术相结合形成的新型含钒铁水“三脱”预处理工艺。通过研究复合喷吹脱硫工艺的喷吹枪位、喷吹速率、脱硫剂配比等参数对脱硫的影响,优化了含钒铁水复合喷吹脱硫工艺,并在提钒过程中实现了脱硅、脱钛。通过对出半钢过程预脱磷技术研究,取得了提高脱磷氧化率、降低炼钢转炉脱磷负担的冶金效果。     

本钢铁水预处理-转炉-二次精炼流程钢液硫含量控制实践

分析了本钢 15 0t高炉铁水预处理 - 15 0t转炉 -二次精炼 -连铸工艺生产的 80 0炉钢水的硫含量的变化。通过喷CaO粉和加Mg粉高效脱硫的铁水预处理能将铁水中平均硫含量从 35 0× 10 -6脱至 5 0×10 -6。在转炉冶炼中 ,因加入含硫废钢和石灰以及精炼前钢水带有少量转炉渣 ,使成品钢水硫含量增至 15 0×10 -6。研究和分析了铁水预处理时 ,石灰喷入量和Mg粉加入量对铁水脱硫的影响。     

铁水预处理过程中溶解氧的实验研究

在实验室条件下,采用Fe2O3-CaO-CaF2和Na2CO3-Na2SO4渣系研究了在铁水预处理过程中熔体氧势的变化规律,寻求有利于同时脱磷脱硫的铁水氧势范围。结果表明,脱磷过程中熔体氧位在5min内迅速上升到5.911×10-6～10.03×10-6,5min后氧位在很小的范围内波动;在1623K温度下的铁水预处理过程中,控制熔体氧势范围为3.0×10-6～6.5×10-6,可获得终点磷含量为0.008%～0.012%的脱磷效果,同时铁水中的硫能降到0.003%～0.007%的水平。     

铁水预处理技术浅析

铁水预处理已经成为现代化炼钢厂的重要工序之一,其目的主要是降低铁水中的某些有害元素含量,为炼钢提供合格的铁水.本文对铁水预处理的原理、工艺及铁水预脱硫、铁水预脱硅、铁水预脱磷等进行了阐述,并对搅拌法脱硫和喷吹法脱硫进行了比较.     

不锈钢喷粉吹氧法铁水脱磷工艺

为了满足生产超低磷钢的预脱磷要求,对不锈钢铁水脱磷工艺进行介绍。在45 t钢包中进行石灰喷粉+吹氧的工业试验,结果表明,在铁水脱硅期达到预期效果(铁水w([Si])≤0.1%)后,铁水脱磷期可实现平均脱磷率大于88%。根据试验数据,分别回归出脱硅期和脱磷期的脱磷率、磷分配比的计算公式。通过添加萤石能够获得较好的铁水脱磷效果,随着铁水硅含量变化,铁水温度、吨钢耗氧量、石灰消耗量、炉渣碱度的增加,铁水的脱磷率明显增加。炉渣w((TFe))的增加对铁水脱磷率的影响不显著。研究认为,目前采用的石灰喷粉+吹氧冶炼进行铁水脱磷处理是行之有效的不锈钢铁水脱磷方法。     

铁水预处理技术发展现状与展望

铁水预处理是现代化炼钢厂的重要工序之一,其主要目的是降低铁水中的有害元素(硫、硅和磷)含量,为炼钢炉提供合格的铁水。介绍了铁水预处理的原理、工艺及国外铁水预处理工艺技术的发展历程。分析了国内外铁水预脱硫、预脱硅和预脱磷等先进工艺技术,并对机械搅拌法脱硫和喷吹法脱硫进行了比较,机械搅拌法动力学条件好,可以采用低成本脱硫剂(CaO)实现深脱硫。     

铁水预处理专用炉的操作控制技术

一种由转炉改造成的铁水预处理新技术己在神户制铁所得到发展。自1983年11月起这项技术已陆续用于大量生产高牌号钢种。这种铁水预处理炉的容量为80t,有两支喷枪用于喷吹熔剂和顶吹氧。铁水左第一阶段用石灰——氧化铁为主的熔剂进行脱硅和脱磷,然后喷吹苏打粉进行脱硫,不需要除渣。本文介绍了这项工艺的操作控制技术,包括以下几项: ①辅助原料最佳量的计算; ②处理后铁水温度的控制; ③最佳处理制度的显示。该技术已获得转炉操作稳定,精炼成本降低和提高生产率的良好效果。     

复合旋转喷吹铁水脱硫预处理工艺研究与应用

鞍钢股份有限公司炼钢总厂结合复合喷吹脱硫和KR搅拌脱硫两种工艺的优势,研制了复合旋转喷吹铁水脱硫预处理工艺,并且增加了脱硫喷枪的喷吹孔数量,调整了喷枪旋转转速,优化了喷吹孔位置分布以及喷吹孔径尺寸等参数。实践表明,采用复合旋转喷吹铁水脱硫预处理工艺可以降低脱硫粉剂消耗约30%,脱硫率提高了4.25%。     

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.