铁浴条件下电炉粉尘球团的熔融与分离行为  

Melting and separation behaviors of electric arc furnace dust pellets under iron bath conditions

作　　者：杨超 佘雪峰 王如意[2] 王静松 薛庆国 Chao YANG;Xue-feng SHE;Ru-yi WANG;Jing-song WANG;Qing-guo XUE(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]宝山钢铁股份有限公司技术中心,上海201900

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第1期347-360,共14页中国有色金属学报（英文版）

基　　金：supported by the National Key R&D Program of China (No. 2019YFC1905703);Provincial Science and Technology Plan Projects in Guangdong Province, China (No. GDKJ2020002)。

摘　　要：为了提高对含锌电弧炉粉尘(EAFD)的利用效率,实验研究EAFD球团在铁浴条件下的还原熔化行为。定义铁液滴球形度作为判断其凝聚的标准,然后探讨铁液滴直径和球形度之间随时间变化的关系。根据实验最终建立EAFD颗粒的熔化和分离行为。结果表明,在铁浴条件下,EAFD球团的Zn去除率在5.0 min时达到99%以上,但在15.0 min时金属渣分离还没有完成。由于成分的波动,在EAFD球团中形成几个区域的液态渣,然后液态渣不断增加,直到球团完全熔化。球形度>65%、直径>500μm的Fe液滴的数量随着时间的推移而减少,大直径的Fe液滴先完成分离。渣铁分离过程如下:在布朗运动下Fe液滴在渣中形成,之后Fe液滴直径在马兰戈尼效应下增加,Fe液滴在渣中下降速度符合斯托克斯定律。To enhance the utilization capacity of zinc-containing electric arc furnace dust(EAFD),the reduction melting behavior of EAFD under iron bath conditions was empirically investigated.The sphericity of Fe droplets was defined as the judgment criterion for its coalescence,and then,the relationship between iron droplet diameter and sphericity was determined over time.The behavior of melting and separation of EAFD pellets was also established based on the experiments.The results showed that the Zn removal rate of EAFD pellets under iron bath conditions reached more than 99%at 5.0 min,but the metal−slag separation was not finished at 15.0 min.Due to the compositional fluctuation,several regions of liquid slag were formed in the EAFD pellets,and then,the liquid slag grew until the pellets melted completely.The number of Fe droplets with sphericity>65%and diameter>500μm decreased with time,and large-diameter Fe droplets were the first to undergo complete separation.The separation process of slag and iron involved the initial formation of Fe droplets via Brownian motion,followed by an increase in the diameter of the iron droplets via the Marangoni effect.The Fe droplets in the slag phase drop rate resembled Stokes Law.

关 键 词：电炉粉尘 铁浴 球团融化 渣铁分离 

分 类 号：TF046.6[冶金工程—冶金物理化学]