不锈钢尘泥球团还原及有害元素脱除行为研究  

Research on reduction and removal of harmful elements in stainless steel dust agglomerates

作　　者：裴文康 杨聪聪[1] 潘建[1] 朱德庆[1] 郭正启[1] 李思唯 PEI Wenkang;YYANG Congcong;PAN Jian;ZHU Deqing;GUO Zhengqi;LI Siwei(School of Minerals Processing and Bioengineering,Central South University,Changsha 400083,Hunan,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400083

出　　处：《钢铁研究学报》2024年第12期1621-1631,共11页Journal of Iron and Steel Research

基　　金：国家重点研发计划资助项目(2023YFC3903904)。

摘　　要：随着不锈钢产业的发展,大量的不锈钢尘泥亟需处理。不锈钢尘泥中含有K、Na、Pb、Zn、S等有害元素,资源化利用并返回主流程使用时会产生不利影响,若能结合不锈钢尘泥预还原球团制备过程进行有害元素的高效脱除,实现闭环过程有害元素的减量,对不锈钢尘泥资源化具有重要意义。借鉴煤基直接还原工艺,研究了不锈钢尘泥球团预热氧化焙烧-煤基预还原过程有害元素的脱除行为,并优化其脱除工艺参数。在C/Fe质量比2,还原温度1250℃,还原80min的最佳预还原条件下,有害元素K、Na、Pb、Zn、S的脱除率分别达到95.47%、55.14%、98.13%、94.27%和65.57%,所得预还原球团抗压强度555N/个,金属化率86.48%,可作为不锈钢电炉冶炼的炉料,实现资源化处理不锈钢尘泥。With the development of the stainless steel industry,there emerges an urgent need to process large amounts of stainless steel dust and sludge.This stainless steel dust and sludge contains harmful elements such as K,Na,Pb,Zn,and S,which can negatively impact the environment when recycled back into the main production process.Effective removal of these harmful elements during the preparation of pre-reduced pellets from stainless steel dust and sludge can significantly reduce their presence in a closed-loop process,marking a significant step towards the resourceful utilization of stainless steel dust and sludge.Researchers draw on coal-based direct reduction processes to investigate the behavior of harmful element removal during the preheating,the oxidation roasting,and the coal-based pre-reduction of stainless steel dust and sludge pellets,and to optimize the parameters of the removal process.Under optimal pre-reduction conditions(C/Fe mass ratio of 2,the reduction temperature of 1250℃,and the reduction time of 80 min)the removal rates for harmful elements K,Na,Pb,Zn,and S reached 95.47%,55.14%,98.13%,94.27%,and 65.57% respectively.The pre-reduced pellets achieved a compressive strength of 555 N per pellet and a metallization rate of 86.48%,making them suitable as feedstock for stainless steel electric furnace smelting and achieving resourceful treatment of stainless steel dust and sludge.

关 键 词：不锈钢尘泥 氧化焙烧 煤基还原 有害元素脱除 

分 类 号：TF09[冶金工程—冶金物理化学]