原料碳含量对转底炉处理含锌粉尘工艺产品质量的影响  

Effect of carbon content of raw materials on product quality of zinc-containing dust process treated by rotary hearth furnace

作　　者：王飞 毛瑞 姚海威 余水 WANG Fei;MAO Rui;YAO Haiwei;YU Shui(Research Institute of Iron&Steel of Jiangsu Province(Shasteel),Zhangjiagang 215625,Jiangsu,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《烧结球团》2025年第1期141-148,共8页Sintering and Pelletizing

摘　　要：原料碳含量是确保转底炉生产线能够高效、低成本处理含锌尘泥的关键参数。为研究原料碳含量对转底炉金属化球团产品质量的影响,本文通过模拟转底炉工艺流程开展了试验研究。利用强度检测、化学分析、电镜分析等方法分析了不同原料碳含量对应的球团强度、金属化率、脱锌率等产品指标。结果表明,原料碳含量增加会导致生球强度劣化,并且碳含量对金属化球团的强度和金属化率指标影响较大,但对脱锌率指标影响相对较小。当原料的碳氧摩尔比达到0.68时,金属化球团产品的整体质量达到较优水平。原料碳含量会直接影响焙烧过程中球团内的FeO含量,而FeO是球团内生成低熔点渣相的关键组分,进而影响金属化球团中的渣相分布和孔隙分布,改变球团内的还原动力学条件。工业试验数据表明,原料碳质量分数从13.61%降低至10.10%,产品金属化率降低约9个百分点,成球率提高约11个百分点,残锌含量基本不变。原料碳质量分数每降低1个百分点,金属化球团产品转鼓强度平均提高4.2个百分点。在转底炉处理含锌尘泥工业生产中将原料碳质量分数控制在10%~11%比较适宜。The carbon content of raw materials is a key parameter to ensure that the rotary hearth furnace production line can process zinc-containing dust sludge efficiently at low cost.In order to research the effect of raw material carbon conternt on the quality of metallized pellet products in rotary hearth furnaces,experimental studies are carried out by simulating the process flow of rotary hearth furnaces.Strength detection,chemical analysis,electron microscopy analysis and other methods are used to analyze the pellet strength,metallization rate,dezincification rate and other product indexes corresponding to the carbon conternt of different raw materials.The results show that the increase of carbon conternt of raw materials will lead to the deterioration of green pellet strength,and the carbon conternt has a great influence on the strength and metallization rate of metallized pellets,but a relatively small effect on the dezincification rate.When the carbon-to-oxygen molar ratio of the raw material reaches 0.68,the overall quality of the metallized pellet product reaches a better level.The carbon fraction of the raw material directly affects the FeO conternt in the pellet during the roasting process.Since FeO is a key component in the pellet to form a low melting point slag phase,which in turn affects the slag phase distribution and pore distribution in the metallized pellet,and changes the reduction kinetic conditions in the pellet.The industrial test data show that if the carbon mass fraction of raw materials is reduced from 13.61%to 10.10%,the metallization rate of the product is reduced by about 9%,the granulation ratio is increased by about 11%,and the residual zinc mass fraction is nearly constant.For every 1%decrease in the carbon mass fraction of raw materials,the drum strength of metallized pellet products is increased by 4.2%on average.In the industrial production of zinc-containing dust sludge treated by rotary hearth furnace,it is more appropriate to control the carbon mass fraction of raw materials at 10%

关 键 词：转底炉 碳含量 金属化率 强度 脱锌率 

分 类 号：TF71[冶金工程—钢铁冶金] X757[环境科学与工程—环境工程]