Kinetics of carbothermic reduction of marmatite in presence of lime

作     者：Rafael PADILLA Juan Yamid CARVALLO María Cristina RUIZ Rafael PADILLA;Juan Yamid CARVALLO;María Cristina RUIZ

作者机构：Metallurgical Engineering DepartmentUniversity of ConcepcionConcepcion 4070371Chile 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2020年第30卷第8期

页      面：2265-2273页

核心收录：

学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：the financial support of Juan Yamid CARVALLO during his graduate studies 

主　　题：kinetics marmatite high-iron sphalerite carbothermic reduction direct reduction ZnCaOS 

摘      要：The direct carbothermic reduction of marmatite in the presence of lime was studied by thermogravimetric method to determine the technical feasibility to produce Zn(g)without polluting with SO2(g).X-ray diffraction analysis of partially reacted samples indicated that the reduction occurred through the formation of ZnCaOS and Ca2Fe2O5 as intermediate products to yield Zn(g),and solid Fe and Ca S as the final *** had the major effect on the rate of *** conversion of marmatite was obtained at 1100℃in about 10 min using 300 mg samples with molar ratio of(Zn,Fe)S:CaO:C equal to 1:1:*** kinetics of the overall reduction reaction was analyzed by the model ln(1-X)=-kt,which represented the data well up to a fractional conversion of 0.95 in the temperature range of 1000-1150℃.The determined activation energy in this temperature range was 257 k J/*** results demonstrated the technical feasibility to produce Zn(g)by this method without producing noxious SO2(g)emissions.