摘要
含铬型钒钛混合料制粒效率低,料层透气性差,严重影响了其发展低温高料层烧结。在基准方案基础上,通过烧结杯试验研究了生石灰配比、混合料水分、润湿时间和制粒时间对含铬型钒钛混合料烧结的影响,并对强化制粒效果进行了观察。试验结果表明:在碱度为2.15、配碳量为3.2%(质量分数)、混合料配加生石灰为5%、水分为7.5%、消化时间为10 min,制粒时间为8 min时,平均粒径d、拟似粒化指数GI0、制粒效率E、抗粉化指数B分别由2.26 mm、66.30%、54.11%、48.15%提高到2.58 mm、80.43%、90.82%、73.53%,烧结速度、成品率、利用系数、转鼓强度分别由16.54 mm/min、70.39%、1.22 t/(m2·h)、55.36%提高到19.70 mm/min、77.94%、1.64 t/(m2·h)、59.36%。含铬型钒钛混合料对水分敏感度高,应严格控制水分波动。采用强化制粒措施,提高料层透气性,增加氧势,可提高烧结矿中铁酸钙质量分数改善其矿物组成与结构,提高产质量。
Cr-bearing vanadium and titanium magnetite（V-Ti-Cr） mixture is of poor granulating efficiency and poor per-meability,and has a serious impact on the development of low temperature and high material layer sintering. The effects of many parameters,including burnt lime addition,mixture moisture,wetting time and granulation time,on the sintering of V-Ti-Cr mixture were performed by sinter pot test and the effects of enhanced granulation were investigated on the ba-sis of reference scheme .The results show that d ,GI0,E ,B increase from 2.26 mm,66.30%,54.11%,48.15%to 2.58 mm, 80.43%,90.82%,73.53%,respectively. And sintering rate,yield,productivity,strength increase from 16.54 mm/min, 70.39%,1.22 t/（m^2·h）,55.36%to 19.70mm/min,77.94%,1.64 t/（m^2·h）,59.36%,respectively,under the conditions of 5%burnt lime addition,7.5%moisture,wetting for 10min and granulation for 8 min when the basicity of the mixture is 2.15, with 3.20%carbon. The moisture fluctuations of V-Ti-Cr mixture with a high sensitivity to moisture should be controlled strictly. The amount of calcium ferrite was increased and the mineral composition and structure of V-Ti-Cr sinter were im-proved,which was achieved by improving the oxygen in the bed with a higher permeability for the enhanced granulation, resulting in higher yield and quality.
出处
《钢铁》
CAS
CSCD
北大核心
2015年第3期39-43,共5页
Iron and Steel
基金
国家高技术研究发展(863)计划资助项目(2012AA062302
2012AA062304)
国家自然科学基金重大资助项目(51090384)
国家自然科学基金资助项目(51174051)
科技部重大国际合作资助项目(2012DFR60210)
关键词
含铬型钒钛矿
强化制粒
生石灰
水分
烧结
Cr-bearing vanadium and titanium magnetite
enhanced granulation
burnt lime
moisture
sinter
