【作者】 杨辉；

【导师】 伍成波；

【作者基本信息】 重庆大学 ， 钢铁冶金， 2007， 硕士

【摘要】 含锌电炉粉尘的成球是配碳球团直接还原技术处理该粉尘的前提,因此首先对试验所用的含锌电炉粉尘的粒度组成和成球性能进行了研究。结果表明:试验所用的含锌电炉粉尘粒度较细,均小于5μm,对成球非常有利,在不加任何粘结剂的条件下生产的球团亦能满足试验要求。在造球实验中还讨论了C/O、成球时间等参数对球团落下强度、抗压强度等性能的影响。为了考察配碳球团处理含锌电炉粉尘技术的可行性,对配碳球团的直接还原技术处理电炉粉尘进行了研究,并完成了半工业扩大性试验,优化了其参数,得到了还原焙烧法的合理工艺条件:碳的过量系数为1.2,还原温度为1150℃,料层厚度为30mm,加热时间为70min。还原后的球团为半金属化球团,其TFe含量50%左右,最高可达54.7%;金属化率60%～70%,最高可达88%;通过差热分析和化学分析方法,确定了收集粉尘中ZnO的含量,表明收集粉尘含ZnO在90%以上,达到了国标规定的等级氧化锌的标准。球团中锌的还原挥发率达90%以上,而球团内残锌含量已达到低于2%的试验要求,完全可以作为高炉炼铁的配料,实现冶金能源的二次利用,说明用配碳球团的直接还原技术处理含锌电炉粉尘是成功的。研究结果为该技术在工业生产中的应用奠定了基础,也为国内外钢铁行业找到了一种能有效回收有价金属资源且具有环境保护意义的处理含锌电炉粉尘的方法。为了考察装料容器对球团料层温度分布的影响和在非随炉加热过程中,热的炉底对料层传热的影响,运用FLUENT6.1.22商用软件分别计算了长方体装料容器和圆柱体装料容器的温度分布,找出了各种球团料层的温度分布的低温区域,为下一步提高料层升温速度和提高处理含锌电炉粉尘的效率提供了依据,模拟结果显示,对于料层高度为30mm的球团料,在放入加热炉内大概20分钟左右,高温炉底由供热炉底开始转化为吸热炉底。最后,通过对炉型优缺点的对比,确定采用转底炉处理含锌电炉粉尘,并对整个工艺的经济效益进行了分析,表明在现行ZnO价位下,用转底炉来处理含锌电炉粉尘,可以实现电炉粉尘的综合利用,不仅有较好的环保效益,而且还有较好的经济效益。更多还原

【Abstract】 Pelletizing of electric Arc Furnace (EAF) dusts include zinc was the base of the technology of carbon-containing pellets direct reduction, so it studied the Particle size and the pelletizing-property of the EAF(electric arc furnace) dust. Experimental results show that the EAF dusts of Nan jing steel are so fine that all particles are less-than 5μm, which is very benefit to pelletize. The performance of pellets could reach experimental requirements without any binder. laboratory experiments studied the effects fallen strength and compression strength what C/O、time infects and so on.In order to studied feasibility of disposing electric Arc Furnace (EAF) dusts with carbon-containing pellets, it studied carbon-containing pellets direct reduction, and semi-industrial scale research was carried, proving feasibility of the equipment and heating-way that devised for the experiment. Research results show that the equipment and heating-way that devised for the experiment are working well. Besides, imposing the technology of carbon-containing pellets direct reduction to dispose EAF dusts had been studied, semi-industrial scale experiments were finished as well, and parameters has been optimized, the better parameters of roasting reduction method are shown as follows: excess coefficient of carbon 1.2, reduction temperature 1150℃, anticipate thickness 30mm, reduction time 60min,The treated pellets were semi-metallic pellet, total Ferrum content in the treated pellet was about 50%, the best got up to 54.7%; metallic ratio was about 60%-70%, the best got up to 88%; zinc oxide content in the collected zinc oxide powder exceeded 90%, while the percent of zinc content in the pellets is lower than 2%, which can meet the requirement of experiments, so the pellets can be used as the assistant materials of Blast Furnace, to some degree this realizes the recycle of metallurgical energy sources, it was proved that succeeded to recycle electric arc furnace(EAF) dust for carbon-containing pellets direct reducing technology. This is the first attempt to put the technique into practice in our country, at besides the author explored the parameters and heating-way of roasting reduction method, finally obtained the best parameters(reduction time、reduction temperature、carbon-oxygen ratio、heating-way、thickness of feed layer and so on). It will establish a hard basic for the industry production and application, of course, find a good means that were economy and efficiency and environmental to disposed EAF.In order to see about the influence of the charge container to the distribution of pellets temperature and of the hot furnace bottom to the material layer heat transfers, FLUENT6.1.2 has been used to calculate the temperature distribution of simulating quadrate and columnar container. Find out the point of the lowest temperature distribution of every container. It can be the foundation of raising the rate of material layer’s temperature heightening and rising the efficiency of disposing EAF dusts containing Zn. The simulative result shows that, when the material layer is 30mm, 20min later after put into the stove, the heat supply hearth is becoming decalescence hearth.At the end, Pass to the contrast of the furnace type about merit and shortcoming, make sure that recycle of Electric Arc Furnace (EAF) dusts with rotary hearth, owing to the economic analysis of whole craft, show value of ZnO now, disposing Electric Arc Furnace (EAF) dusts with rotary hearth, integrated utilization about electric Arc furnace (EAF) dusts, it not only have good environment, but also high economical benefit.更多还原