Manganese extraction from high-iron-content manganese oxide ores by selective reduction roasting-acid leaching process using black charcoal as reductant
来源期刊：中南大学学报(英文版)2015年第7期
论文作者：ZHANG Yuan-bo ZHAO Yi YOU Zhi-xiong DUAN Dao-xian LI Guang-hui JIANG Tao
文章页码：2515 - 2520
Key words：manganese ore; reduction roasting; acid leaching; black charcoal
Abstract: Reduction roasting-acid leaching process was utilized to process high-iron-content manganese oxide ore using black charcoal as reductant. The results indicate that, compared with the traditional reductant of anthracite, higher manganese extraction efficiency is achieved at lower roasting temperature and shorter residence time. The effects of roasting parameters on the leaching efficiency of Mn and Fe were studied, and the optimal parameters are determined as follows: roasting temperature is 650 °C, residence time is 40 min, and black charcoal dosage is 10% (mass fraction). Under these conditions, the leaching efficiency of Mn reaches 82.37% while that of Fe is controlled below 7%. XRD results show that a majority of MnO2 and Fe2O3 in the raw ore are reduced to MnO and Fe3O4, respectively.
ZHANG Yuan-bo(张元波), ZHAO Yi(赵熠), YOU Zhi-xiong(游志雄), DUAN Dao-xian(段道显), LI Guang-hui(李光辉), JIANG Tao(姜涛)
(School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:Reduction roasting-acid leaching process was utilized to process high-iron-content manganese oxide ore using black charcoal as reductant. The results indicate that, compared with the traditional reductant of anthracite, higher manganese extraction efficiency is achieved at lower roasting temperature and shorter residence time. The effects of roasting parameters on the leaching efficiency of Mn and Fe were studied, and the optimal parameters are determined as follows: roasting temperature is 650 °C, residence time is 40 min, and black charcoal dosage is 10% (mass fraction). Under these conditions, the leaching efficiency of Mn reaches 82.37% while that of Fe is controlled below 7%. XRD results show that a majority of MnO2 and Fe2O3 in the raw ore are reduced to MnO and Fe3O4, respectively.
Key words:manganese ore; reduction roasting; acid leaching; black charcoal
