Purification of Leachate from Simultaneous Leaching of Galena Concentrate and Pyrolusite and Preparation of PbSO4 and Mn3O4

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• 作者：Wenqing Qin ; Fen Jiao ; Benjun Xu ; Hui Liu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：April 18, 2012
• 年：2012
• 卷：51
• 期：15
• 页码：5596-5607
• 全文大小：644K
• 年卷期：v.51,no.15(April 18, 2012)
• ISSN：1520-5045

文摘

This paper presents the results of investigation on simultaneous leaching of galena concentrate and pyrolusite in acid medium. It has been confirmed that the leached products as the raw materials鈥擯bCl₂, MnCl₂ for the PbSO₄ and Mn₃O₄ preparations could be obtained during the leaching processes. Special emphasizes are placed on the purification of the simultaneous leaching solution including removals of Fe²⁺, Pb²⁺, Zn²⁺, Ca²⁺, and preparations. The factors affecting the purification, such as pH, temperature, agitation rate, and dosages of Cl^{鈥?/sup> and Na₂S are investigated in leaching cells. The results show that, at appropriate conditions, iron is removed in the form of FeOOH, Pb2+ and Zn2+ are vulcanized by Na₂S, and Ca2+ is removed in the form of CaF₂ precipitation. After purification and crystallizing-out of PbCl₂ (97.17%), the effects of pH, temperature, reaction time, concentration, stirring rate, and drying methods on preparations are examined. The mechanisms are addressed by theoretical calculations and experiments. The results indicate that the content of PbSO₄ is 99.46% characterized by elemental analysis, XRD, and SEM. The purity of Mn₃O₄ is identified by TG-DSC, chemical analysis, and XRD, and the Mn in the Mn₃O₄ product accounts for 71.7%.}