Removal Mechanism of Zn,Pb and Alkalis from Metallurgical Dusts in Direct Reduction Process

作     者：Xue-feng SHE Jing-song WANG Guang WANG Qing-guo XUE Xin-xin ZHANG 

作者机构：State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology Beijing School of Mechanical EngineeringUniversity of Science and Technology Beijing 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2014年第21卷第5期

页      面：488-495页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：Item Sponsored by China Postdoctoral Science Foundation(2012M510320) Demonstration Project about Recycling Economy in2007of National Development and Reform Commission of China(3194) 

主　　题：rotary hearth furnace zinc-bearing dust direct reduction zinc removal 

摘      要：The high-temperature tube furnace was applied to simulate the rotary hearth furnace （RHF） for the direct reduction of zinc-bearing dusts from steel plants. The removal mechanism of Zn, Pb and alkalis from cold bonded briquettes made by mixing metallurgical wastes, such as dust from bag house filter, OG sludge, fine converter ash and dust from the third electric field precipitator of the sinter strand, in various proportions was investigated. More than 70% of metallization rate, more than 95% of zinc removal rate, 80% of lead removal, as well as more than 80M of K and Na removal rates were achieved for the briquettes kept at 1473-1603 K for 15 min during the direct reduction process respectively. The soot generated in the direct reduction process was studied by chromatography, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results suggested that the main phases of the soot were ZnO, KC1, NaC1 and 4ZnO · ZnC12 · 5H20. Furthermore, the content of Zn reached 64.2 %, which could be used as secondary resources for zinc making. It was concluded that KC1 and NaC1 in secondary dust resulted from the volatilization from the briquettes, whilst ZnO and PbO were produced by the oxidation of Zn or lead vapour from briquettes by direct reduction.