Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 23    No. 2    February 2013

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Response surface optimization of process parameters for reduction roasting of low-grade pyrolusite by bagasse
Ke-di YANG1, Xian-jia YE1, Jing SU1, Hai-feng SU1, Yun-fei LONG1, Xiao-yan Lü2, Yan-xuan WEN1

1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
2. Educational Administration Department, Guangxi University, Nanning 530004, China

Abstract:The reduction roasting processes for low-grade pyrolusite using bagasse as the reducing agent was statistically analyzed. The central composite rotatable design (CCD) was used to optimize this reduction roasting processes. The three process parameters studied were the mass ratio of bagasse to ore, the roasting temperature and the roasting time. Analysis of variance (ANOVA) was used to analyze the experimental results. The interactions between the process parameters were done by using the linear and quadratic model. The results revealed that the linear and quadratic effects as well as the interaction are statistically significant for the mass ratio and roasting temperature but insignificant for the roasting time. The optimal conditions of 0.9:10 of mass ratio, the roasting temperature of 450 °C, the roasting time of 30 min were obtained. Under these conditions, the predicted leaching recovery rate for manganese was 98.1%. And the satisfied experimental result of 98.2% confirmed the validity of the model.


Key words: pyrolusite; reduction roasting; bagasse; response surface methodology

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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