含铁尘泥球团成型用复合黏结剂开发及应用  

Development and application of composite binder for iron-bearing dust pellets molding

作　　者：任晓健[1] 周荣宝 杨涛 马磊 雷杰 龙红明 REN Xiaojian;ZHOU Rongbao;YANG Tao;MA Lei;LEI Jie;LONG Hongming(Resource Utilization Research Office,Jiangsu Yonggang Group Co.,Ltd.,Zhangjiagang 215628,Jiangsu,China;School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling,Maanshan 243002,Anhui,China)

机构地区：[1]江苏永钢集团有限公司资源利用研究室,江苏张家港215628 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243002

出　　处：《钢铁》2024年第2期164-172,共9页Iron and Steel

基　　金：安徽省自然科学基金杰青项目资助项目(2208085J19)。

摘　　要：转底炉直接还原工艺具有有价元素收得率高、杂质脱除程度高的优势,成为钢铁企业含铁尘泥处理技术发展的趋势之一。但由于含铁尘泥成球性能差,导致制备出的含铁尘泥球团强度低,易粉化,严重制约了转底炉工艺的绿色高效生产。选择优良的黏结剂是改善球团原料性能和提高球团矿产质量的重要手段。通过有机黏结剂和膨润土搭配制备出复合黏结剂,探究了复合黏结剂对球团冷态性能和还原性能的影响。研究表明,复合黏结剂球团表现出优异的生球性能,其中CB2-3组(3%膨润土+0.5%黏结剂B)的生球落下强度及抗压强度分别达到8.5次/0.5 m和78 N/P,这是由于有机黏结剂含有丰富的—OH、—COO—等含氧基团,改善了含铁尘泥表面的亲水性,强化了膨润土与尘泥颗粒间的连接。黏结剂C在干燥过程会形成网状结构,促进尘泥颗粒间相互靠近,这是CB3组(3%膨润土+2%黏结剂C)干球强度提升的重要因素。同时,有机组分的增加有助于铁、锌氧化物的还原反应,主要原因是有机组分高温下热解,在球团内部形成微小孔隙,加快了燃料的热解和还原产物的扩散,促进还原反应的正向进行,但生成的过量孔隙会导致球团强度下降。工业试验表明,相较于现场使用的复合黏结剂YG-1,添加CB2-3和CB3后,可明显提高含铁尘泥球团的产质量指标,同时黏结剂成本由140元/t分别降至115元/t和120元/t,达到提质降本的效果。The treatment of iron-bearing dusts and sludges by the rotary hearth furnace process has the advantage of sufficient utilization of valuable metals and a high impurity removal rate,and becomes one of the development trends of iron-bearing dust sludge treatment technology.However,the poor balling performance of iron-bearing dust sludge leads to low strength and easy pulverization of the pellets,which seriously restricts the environmental and efficient production of the rotary hearth furnace process.An important means of improving the performance of raw materials and increasing the yield and quality of pelletized ore is the use of excellent binder.The composite binder was prepared by matching organic binder and bentonite,and the effect of composite binder on the cold performance and reduction performance of pellets was investigated.It was shown that the composite binder pellets exhibited excellent green pellets performance.The drop strength and compressive strength of green pellets in the CB2-3 group(3%bentonite+0.5%binder B)reached 8.5 times/0.5 m and 78 N/P,respectively.It is because the organic binder has rich oxygen-containing groups,such as—OH,—COO—,etc.,which improves the hydrophilicity of the surface of the iron-bearing dust sludge and strengthens the connection between the bentonite and the iron-bearing dust sludge concentrate particles.The binder C forms a mesh structure during the drying process,which promotes the proximity of dust particles to each other,and was the main factor in the dry-ball strength enhancement of the CB3 group(3%bentonite+2%binder C).Meanwhile,the reduction of iron oxides and zinc oxides was more fully due to the increase in the content of organic components.The main reason is the pyrolysis of organic components at high temperature,which accelerates the pyrolysis of solid fuels and the diffusion of reduction products.However,excessive pore generation will lead to a decrease in the strength of the pellets.Industrial tests shown that compared with the composite binder YG-1 used i

关 键 词：黏结剂 含铁尘泥 膨润土 工业试验 脱锌率 

分 类 号：TF046.6[冶金工程—冶金物理化学]