Reaction kinetics characteristics of pyrolusite leaching process enhanced by rigid-flexible combined impeller

被引：0

作者：

Xie Z. ^{[1
,2
]}

Chen G. ^{[1
,2
]}

Liu R. ^{[1
,2
]}

Liu Z. ^{[1
,2
]}

Cen S. ^{[1
,2
]}

Tao C. ^{[1
,2
]}

Guo S. ^{[3
]}

机构：

[1] School of Chemistry and Chemical Engineering, Chongqing University, Chongqing

[2] State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing

[3] Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming

来源：

Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 05期

关键词：

Hydrometallurgy; Kinetics; Leaching; Pyrolusite; Reduction; Rigid-flexible combined impeller;

D O I：

10.11949/0438-1157.20201304

中图分类号：

学科分类号：

摘要：

In the process of wet leaching of pyrolusite, the traditional stirring blade reactor is prone to fluid "swirling", which leads to poor mass transfer effects and lower reaction efficiency. In this paper, rigid-flexible combined impeller was applied to reduction leaching process of pyrolusite to enhance manganese ore leaching efficiency. The results show that under the condition of pyrite-to-pyrolusite mass ratio is 0.20, the sulfuric acid concentration is 1.5 mol/L, the liquid-to-solid mass ratio is 10, and the temperature is 363 K, the leaching rate of manganese in pyrolusite reaches 90.12%, which is 5.5% higher than that of traditional impeller. Simultaneously, it is also found that the leaching process follows the shrinking core model and is controlled by the surface chemical reaction. The reaction orders of pyrite-to-pyrolusite mass ratio, sulfuric acid concentration and liquid-to-solid ratio are 1.2679, 0.4182 and 1.1959, respectively, and kinetic equation is 1- (1-X)1/3=0.96×103(m_(FeS_2 )/m_(MnO_2 ))1.2679×[H2SO4]0.4182(L/S)1.1959exp(-41.75×103/RT)t, the apparent activation energy of the leaching process is 41.75 kJ /mol. The apparent activation energy of pyrolusite leaching reaction in rigid-flexible combined impeller system is 4.515-20.54 kJ/mol lower than that in regular agitation system. © 2021, Editorial Board of CIESC Journal. All right reserved.

引用

页码：2586 / 2595

页数：9

共 32 条

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