Effect of CacO_(3) on volatilization of self-reduced zinc from blast furnace dust
作者机构：School of Metallurgical EngineeringXi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina
出 版 物：《Journal of Iron and Steel Research(International)》 (钢铁研究学报（英文版）)
年 卷 期：2022年第29卷第9期
页 面：1404-1411页
核心收录：
学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 0706[理学-大气科学]
基 金：support by Nat-ural Science Basic Research Plan in Shaanxi Province of China(No.2019JLM-35) National Natural Science Foundation of China(No.51774224) Key Laboratory of Ecological Metallurgy of Mul-timetlie Mineral(Northeastem University)of Ministry of Education.
主 题：Blast furnace dust Self reducing zinc extraction Calcium carbonate Zinc ferrite
摘 要：To solve the problem of low reduction extraction rate of zinc from blast furnace dust,the effects of CacO3 addition,reduction temperature,and reduction time on self-reduction zinc extraction were studied through high-temperature reduction experiment,and the mechanism of how CaCO_(3) addition promotes zinc ferrite reduction was analyzed.The zinc removal rate can reach 98.82%when the blast furnace dust is reduced at 1000℃ for 25 min by adding 10 mass%CaCO_(3).At low temperature,CaCO_(3) can enhance the reduction and decomposition of ZnFe_(2)O_(4)(which is difficult to reduce)into ZnO and low-valent iron oxides.After CaCO_(3) is decomposed at high temperature,CO_(2) is produced to undergo gasification reaction with carbon in blast furnace dust,and co is generated to provide more reducing agents for the whole reduction system.CaO generated by decomposition can also catalyze the gasification reaction of carbon,thus improving the removal rate of zinc in the reduction process of dust.
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