含锌粉尘有机粘结剂团块干燥行为及热态失稳机制  被引量:2

Drying behavior and thermal instability mechanism of briquettes made from zinccontaining dust and organic binder

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作  者:杨聪聪[1,2] 曲士娟 朱德庆 潘建[1,2] 曹志成[3] 吴佩佩 YANG Congcong;QU Shijuan;ZHU Deqing;PAN Jian;CAO Zhicheng;WU Peipei(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Low Carbon and Hydrogen Metallurgy Research Center,Central South University,Changsha 410083,Hunan,China;Rotary Hearth Furnace Division,Baowu Group Environmental Resources Technology Co.,Ltd.,Shanghai 201900,China)

机构地区:[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]中南大学低碳与氢冶金研究中心,湖南长沙410083 [3]宝武集团环境资源科技有限公司转底炉事业部,上海201900

出  处:《钢铁研究学报》2023年第12期1463-1472,共10页Journal of Iron and Steel Research

基  金:湖南省重点研发计划资助项目(2022SK2075)。

摘  要:针对含锌粉尘压团工艺粘结剂耗量大、成本高,团块热稳定性差等问题,基于现场物料及配矿方案,通过动态干燥试验,研究了干燥参数对含锌粉尘干团块强度和干燥粉末量影响规律,并对含锌粉尘有机粘结剂团块热态失稳机制进行了探讨。试验结果表明,对以淀粉为粘结剂制备的含锌粉尘生团块,提高干燥风温和风速、延长干燥时间和增加料层高度均会降低干团块强度、增加干燥粉末量。主要原因是:有机粘结剂热稳定性差,高温易热解;含锌粉尘粒度细而分布窄,不利于团块内形成较合理的毛细管半径,也限制了颗粒间相互咬合和粘结力发展;部分高钙型含锌粉尘游离氧化钙含量高,易水化引起团块体积膨胀。生产中可通过开发和使用高热稳定性、低成本复合粘结剂,将含锌粉尘与粒度较粗、粒级较宽的原料优化配矿及对高钙型含锌粉尘进行提前消解等措施,以改善含锌粉尘团块性能。In view of the problems of large binder consumption,high production cost,poor thermal stability in the current zinc-containing dust briquetting process,based on on-site materials and blending scheme,the influence of drying parameters on the strength and dry powder amount of zinc-containing dust dry mass were investigated by dynamic drying tests.Thermal instability mechanism of the zinc-containing dust organic binder mass drying process was also discussed.The experimental results indicate that,starch should be used as a binder to prepare zinc-containing dust briquettes in a dynamic drying process system with low temperature and low wind speed.Increasing the temperature and wind speed of the drying air,prolonging the drying time,and increasing the height of the material layer will all reduce the strength of the dry agglomerates and increase the amount of dried powder.Under optimal process conditions,the thermal structure and performance instability mechanism of zinc-containing dust briquettes can be attributed to three reasons.First,organic binders have poor thermal stability and are prone to pyrolysis at high temperatures.Second,the fine particle size and narrow distribution of zinc-containing dust are not conducive to the formation of a more reasonable capillary radius within the cluster and also limit the development of mutual bite and bonding force between particles.Third,some high-calcium-containing zinc-containing dust usually contains a large amount of free calcium oxide with high content,which is prone to volume expansion due to hydration during the pressing process,which in turn affects the strength of subsequent dry masses.Therefore,in actual production,measures such as adding high-thermal stability and low-cost composite binders,optimizing coarse and fine matching with coarse-grained and wide-grained reducing agent raw materials before pressing zinc-containing dust,and pre-dissolving free calcium oxide in zinc-containing dust can be taken to effectively improve the performance of zinc-containing dust bri

关 键 词:含锌粉尘 有机粘结剂 动态干燥 热稳定性 

分 类 号:TF046.6[冶金工程—冶金物理化学] TF55[环境科学与工程—环境工程] X705

 

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