| Neutral Leaching of Low-Grade Pyrolusite with High Silica Content |
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| 作者姓名： | 郑建华 罗红玉 田熙科 王龙艳 杨超 皮振邦 |
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| 作者单位： | Faculty of Material Science and Chemical Engineering China University of Geosciences，Faculty of Material Science and Chemical Engineering China University of Geosciences，Faculty of Material Science and Chemical Engineering China University of Geosciences，Faculty of Material Science and Chemical Engineering China University of Geosciences，Faculty of Material Science and Chemical Engineering China University of Geosciences，Faculty of Material Science and Chemical Engineering China University of Geosciences，Wuhan 430074 China，Wuhan 430074 China，Wuhan 430074 China，Wuhan 430074 China，Wuhan 430074 China，Wuhan 430074 China |
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| 基金项目： | 湖北省武汉市科技局科研项目 |
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| 摘 要： | Leaching studies of low-grade pyrolusite, containing 11.84% Mn with high silicon, were carried out using sodium sulfite as a reductant in ammonium sulfate medium. Various process parameters including temperature, leaching time, solid-liquid ratio, quantity of ammonium sulfate, as well as the amount of reducing agent were studied in detail. The manganese extraction yield was the response of the process. Temperature and reagent concentration exerted the most important positive effect on the manganese extraction. The optimized conditions showed that when the amount of reducing agent was a stoichonmetric amount, over 90% manganese extraction and the lowest impurities were achieved, the amount of heavy metal impurities in the manganese leaching liquid was less than 5 mg/L, and almost no iron and aluminum were extracted in 3 mol/L ammonium sulfate concentration at 100 ℃ in 45 min.
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| 关 键 词： | 软锰矿 杂质 硅 硫酸铵 中性浸出 |
| 收稿时间： | 10 January 2007 |
| 修稿时间： | 2007-01-102007-03-20 |
Neutral Leaching of Low-Grade Pyrolusite with High Silica Content |
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| Zheng Jianhua,Luo Hongyu,Tian Xike,Wang Longyan,Yang Chao,Pi Zhenbang.Neutral Leaching of Low-Grade Pyrolusite with High Silica Content[J].Journal of China University of Geosciences,2007,18(2):25-166,176. |
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| Authors: | Zheng Jianhua Luo Hongyu Tian Xike Wang Longyan Yang Chao Pi Zhenbang |
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| Institution: | Faculty of Material Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Leaching studies of low-grade pyrolusite, containing 11.84% Mn with high silicon, were carried out using sodium sulfite as a reductant in ammonium sulfate medium. Various process parameters including temperature, leaching time, solid-liquid ratio, quantity of ammonium sulfate, as well as the amount of reducing agent were studied in detail. The manganese extraction yield was the response of the process. Temperature and reagent concentration exerted the most important positive effect on the manganese extraction. The optimized conditions showed that when the amount of reducing agent was a stoichonmetric amount, over 90% manganese extraction and the lowest impurities were achieved, the amount of heavy metal impurities in the manganese leaching liquid was less than 5 mg/L, and almost no iron and aluminum were extracted in 3 mol/L ammonium sulfate concentration at 100 ℃ in 45 min. |
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| Keywords: | low-grade pyrolusite neutral leaching ammonium sulfate |
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