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Reduction-Roast Leaching of Low-Grade Pyrolusite Using Bagasse as a Reducing Agent

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Abstract:

Bagasse, a fibrous residue from sugarcane juice extraction, was used as a reducing agent to roast low-grade pyrolusite in N2. The roasted ore was further leached using sulfuric acid, to convert manganese oxide in the ore to manganese sulfate. The effects of weight ratio of bagasse to manganese ore, roasting temperature, roasting time, leaching temperature, leaching time, stirring speed and sulfuric acid concentration on the leaching recovery of manganese were investigated. Optimal conditions were determined to be a bagasse to manganese ore weight ratio of 0.8:10, roasting temperature of 500°C for 40 min, leaching stirring speed of 100 rpm, sulfuric acid concentration of 3 mol•L-1 and leaching temperature of 50°C for 40 min. The leaching recovery rate of manganese was up to 97.8% at the optimal conditions.

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Periodical:

Advanced Materials Research (Volume 699)

Pages:

28-33

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.699.28

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Online since:

May 2013

Authors:

Yun Fei Long, Jing Su, Xian Jia Ye, Hai Feng Su, Yan Xuan Wen

Keywords:

Bagasse, Pyrolusite, Reduction Roasting

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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