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采用共存理论计算了提钒炉渣V_2O_3-SiO_2-TiO_2-Cr_2O_3-MgO-MnO-FeO中V_2O_3的活度系数,研究了炉渣组元、温度对V_2O_3活度系数的影响,得到V2O3的活度系数为0.5×10~(-6)~9.0×10~(-6)。通过对V-C平衡进行研究,得出了V-C氧化的转化温度为1380℃,即吹炼过程铁水控制温度。采用具备顶底复吹功能的500kg中频感应炉模拟了复吹转炉铁水提钒工艺,试验结果表明:吹炼终点钒质量分数平均为0.06%,钒氧化率为95%。底吹搅拌可以显著加速铁水中钒的氧化,缩短3min的冶炼周期。 相似文献
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在实验条件下,研究了低钒铁水钒氧化的动力学,导出了脱钒正逆反应的限制环节和反应速度表达式,计算了铁水脱钒后的终点含钒量,获得了低钒铁水合理的吹钒温度制度。研究表明,顶底复吹工艺有利于含钒铁水的提钒。10t氧顶转炉吹炼含0.31%V的低钒铁水时,钒、碳氧化动力学与实验室研究规律一致,提钒工艺的技经指标达到了国内先进水平。 相似文献
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摘要:为了有效减少了转炉提钒过程的碳烧损量,在硅钼炉内进行氧化性炉渣与铁水在不同温度下的渣金反应实验,发现炉渣与铁水的反应速率随温度的升高而加快;温度越高铁红(Fe2O3)将钒氧化到极值的速度越快,但达到极值后钒会被还原回铁水中,且还原速度也随温度的升高而提高;温度越高钒渣中的钒被铁水中碳还原的量越大。根据实验结果对转炉提钒工艺进行了优化,吹炼温度为1340~1350℃时加入冷却剂,控制较低的终点温度,在钒氧化率不降低的情况下,碳烧损率从19.39%降到17.91%、碳烧损量从0.82%减少到0.76%,有效减少了转炉提钒过程的碳烧损。 相似文献
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氧气底吹转炉吹炼高钒铁水具有钒氧化率高回收率高,吹炼过程顺行,不喷、不粘、半钢合乎炼钢要求,钒渣V_2O_5品位高,炉衬寿命高等工艺特性且吹钒综合指标良好。它为“含钒钢渣返回高炉富集—火法炼钒铁流程”(简称:单渣返回流程)打通了道路,并给火法提钒提供了一个崭新的工艺方案。 本文阐述了氧气底吹转炉吹钒冶金规律。探讨了钒一碳选择性氧化临界温度的热力学计算,认为按反应产物为FeO·V_2O_3的公式来估算钒一碳选择性氧化临界温度更适合于吹钒实践。选择了适宜的吹炼温度制度及冷却制度。 讨论了动力学条件对脱钒的影响及增碳措施对去钒保碳,提高钒渣质量的效用。 相似文献
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《特殊钢》2017,(1)
4.28%~5.02%C,0.19%~0.24%V铁水经提钒后的半钢成分为3.30%~3.80%C,≤0.037%V。"留渣+双渣"法为留上一炉渣,兑入提钒半钢和50~70 kg/t废钢加入石灰和白云石进行吹炼5~6 min,倒渣,并加入适量石灰和白云石继续吹炼至终点。结果表明,吹炼前期随着炉渣碱度或温度的增加,钢水脱磷率先增加后降低,而随着渣中(FeO)增加脱磷率先增加后稳定,前期最佳控制条件为炉渣碱度3.0~3.5,(FeO)10.0%~15.0%,倒渣温度1 480~1 510℃;转炉吹炼后期,随着炉渣碱度的增加脱磷率升高,而随着温度的增加脱磷率降低,(FeO)对脱磷率的影响与前期较为相近,转炉吹炼终点控制碱度3.5~4.0,(FeO)8.0%~10.0%,温度≤1630℃为宜,脱磷率在90.0%以上;此工艺可将钢水终点[P]控制在0.015%以内,满足低磷钢冶炼的需求。 相似文献
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氧气底吹转炉吹炼含Si0.16%,Mn0.19%,V0.355%的铁水,能得到质量满意的钒渣。其特点是:钒渣(V_2O_5)高(23%),氧化铁低(TFe35.28%)有利于钒铁合金生产。半钢含碳3.77%,余钒0.01%,(V)/[V]高(891~1298)。有利于炼钢生产。 相似文献
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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。 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献