Roasting Reduction and Its Kinetics of Low-Grade Pyrolusite by Biomass Char

doi:10.3969/j.issn.1005-3026.2015.10.025

Journal of Northeastern University:Natural Science ›› 2015, Vol. 36 ›› Issue (10): 1482-1486.DOI: 10.3969/j.issn.1005-3026.2015.10.025

• Resources & Civil Engineering • Previous Articles Next Articles

Roasting Reduction and Its Kinetics of Low-Grade Pyrolusite by Biomass Char

FENG Ya-li¹， ZHANG Shi-yuan^1,2， LI Hao-ran²， ZHOU Yu-zhao¹

1. School of Civil and Environmental Engineering， University of Science and Technology Beijing，Beijing 100083， China ; 2. National Key Laboratory of Biochemical Engineering， Institute of Process Engineering， Chinese Academy of Sciences， Beijing 100190， China.

Received:2014-04-01 Revised:2014-04-01 Online:2015-10-15 Published:2015-09-29
Contact: FENG Ya-li
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Abstract

Abstract: Roasting reduction contrast experiments of low-grade pyrolusite were performed by using biomass char and activated carbon as the reductant in a tube furnace. The effects of roasting temperature， roasting time and the dosage of biomass char on manganese reduction efficiency of pyrolusite were studied， and X-ray diffraction analysis was carried out for the roasting products. The results indicated that biomass char is obviously better than activated carbon in roasting time and manganese reduction efficiency.Roasting reduction of pyrolusite undergoes the process of MnO₂→Mn₂O₃→Mn₃O₄→MnO. Manganese reduction efficiency greater than 98% was achieved when roasting temperature is 800℃， roasting time is 50min and the dosage of biomass char is 10%. Based on the results， the reduction kinetics equation was derived， and it is confirmed that the reduction process is controlled by interface chemical reaction， and the apparent activation energy is about 43.896kJ·mol^-1.

Key words: low-grade pyrolusite, biomass char, roasting reduction, mechanism study, reaction kinetics

CLC Number:

TF792

FENG Ya-li， ZHANG Shi-yuan， LI Hao-ran， ZHOU Yu-zhao. Roasting Reduction and Its Kinetics of Low-Grade Pyrolusite by Biomass Char[J]. Journal of Northeastern University:Natural Science, 2015, 36(10): 1482-1486.

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Roasting Reduction and Its Kinetics of Low-Grade Pyrolusite by Biomass Char

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