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Promotion of manganese extraction and flue gas desulfurization with manganese ore by iron in the anodic solution of electrolytic manganese
Hydrometallurgy ( IF 4.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.hydromet.2020.105542
Lu Yao , Guangzhi Xin , Pengyan Pu , Lin Yang , Xia Jiang , Zhicheng Jiang , Wenju Jiang

Abstract In this work, Mn ore was mixed with the wastewater anode solution of electrolytic Mn (ASEM, instead of water) and utilized as the desulfurizer for simultaneous SO2 removal from flue gas and Mn extraction. The effects of Fe2+ and Fe3+ on Mn leaching and flue gas desulfurization were investigated. For MnO2 and Mn2O3 (mixed with ASEM), the introduction of Fe2+could simultaneously increase Mn extraction efficiency and flue gas desulfurization efficiency when MnO2 and Mn2O3 mixed with ASEM was used. Fe3+ addition could improve desulfurization efficiency obviously for MnCO3. Fe2+ could react with MnO2 and H+ to form Mn2+ and Fe3+. This reaction further improved Mn extraction and simultaneously decreased the acidity of ASEM, thus promoting SO2 removal. The introduced Fe3+ could react with SO2, when MnO2 was absent from the desulfurizer slurry. The resulting Fe2+ was then oxidized by O2 to form Fe3+, which underwent a Fe3+ ↔ Fe2+ cycle to promote flue gas desulfurization. Thus, the introduction of Fe ions, especially Fe2+, could promote simultaneous Mn leaching and flue gas desulfurization with Mn ore. This work provided not only a new way for effective SO2 removal from flue gas and Mn extraction but also for recycling ASEM.

中文翻译:

电解锰阳极溶液中铁对锰矿提锰及烟气脱硫的促进作用

摘要 在这项工作中,将锰矿石与电解锰的废水阳极溶液(ASEM,而不是水)混合,用作脱硫剂,同时从烟气中去除 SO2 并提取锰。研究了Fe2+和Fe3+对锰浸出和烟气脱硫的影响。对于 MnO2 和 Mn2O3(与 ASEM 混合),当使用 MnO2 和 Mn2O3 与 ASEM 混合时,Fe2+的引入可以同时提高 Mn 提取效率和烟气脱硫效率。Fe3+的加入可以明显提高MnCO3的脱硫效率。Fe2+ 可与MnO2 和H+ 反应生成Mn2+ 和Fe3+。该反应进一步改善了锰的提取,同时降低了 ASEM 的酸度,从而促进了 SO2 的去除。当脱硫剂浆液中不含 MnO2 时,引入的 Fe3+ 可以与 SO2 反应。生成的 Fe2+ 然后被 O2 氧化形成 Fe3+,Fe3+ 经历 Fe3+ ↔ Fe2+ 循环以促进烟气脱硫。因此,引入Fe离子,尤其是Fe2+,可以促进Mn矿石同时浸出和烟气脱硫。这项工作不仅为有效去除烟气中的 SO2 和提取锰提供了一种新方法,而且还为 ASEM 的回收利用提供了新途径。
更新日期:2021-02-01
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