Fluidized roasting reduction kinetics of low-grade pyrolusite coupling with pretreatment of stone coal

被引：19

作者：

Feng, Ya-li ^{[1
]}

Cai, Zhen-lei ^{[1
]}

Li, Hao-ran ^{[2
]}

Du, Zhu-wei ^{[2
]}

Liu, Xin-wei ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Civil & Environm Engn, Beijing 100083, Peoples R China

[2] Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2013年 / 20卷 / 03期

基金：

中国国家自然科学基金; 国家高技术研究发展计划(863计划);

关键词：

pyrolusite; ore roasting; ore reduction; fluidized beds; kinetics; stone coal; MANGANESE OXIDE ORE; SULFURIC-ACID; DIOXIDE;

D O I：

10.1007/s12613-013-0716-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Based on the fluidized roasting reduction technology of low-grade pyrolusite coupling with pretreatment of stone coal, the manganese reduction efficiency was investigated and technical conditions were optimized. It is found that the optimum manganese reduction efficiency can be up to 98.97% under the conditions that the mass ratio of stone coal to pyrolusite is 3: 1, the roasting temperature of stone coal is 1000 degrees C, the roasting temperature of pyrolusite is 800 degrees C, and the roasting time is 2 h. Other low-grade pyrolusite ores in China from Guangxi, Hunan, and Guizhou Provinces were tested and all these minerals responded well, giving similar to 99% manganese reduction efficiency. Meanwhile, the reduction kinetic model has been established. It is confirmed that the reduction process is controlled by the interface chemical reaction. The apparent activation energy is 36.397 kJ/mol.

引用

页码：221 / 227

页数：7

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