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首页> 外文期刊>International Journal of Environmental Impacts: Management, Mitigation and Recovery >TREATMENT OF MANGANESE IN ACID AND NEUTRAL MINE DRAINAGE USING MODIFIED DOLOMITE
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TREATMENT OF MANGANESE IN ACID AND NEUTRAL MINE DRAINAGE USING MODIFIED DOLOMITE

机译：我治疗的锰酸和中性排水使用修改后的白云石

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摘要

The treatment of manganese [Mn] in acid mine drainage (AMD) and neutral mine drainage (NMD) is prone to variation in performance, which depends on several factors, including pH, Mn and dissolved oxygen (DO) concentrations, catalysis by Mn-/iron [Fe]-solids, presence of ligands, and bacteria. Notwithstanding the recent technological and scientific advancements, Mn removal is notoriously difficult and still challenging because of its complex chemistry and high solubility. Precipitation of Mn(II), in AMD and NMD, occurs in the form of oxides, with prior oxidation to Mn(III) and Mn(IV), or as carbonates and sulphides. However, most treatment systems have limited efficiency in simultaneously treating Mn and other metals in AMD/NMD, necessitating secondary treatment for Mn removal. Modification of natural or residual materials was found efficient for the treatment of NMD. In this context, this study evaluated the performance of half-charred dolomite (1 h at 750℃) in batch testing (solid: liquid ratio of 3 g:400 mL) for Mn treatment in AMD and NMD. Results showed that modified dolomite treated more than 98% Mn in synthetic NMD (pH 6.1-6.3, up to 1 g/L Mn), at final pH of 9.7-10.6. Similar efficiency (98%) in Mn removal was also found for synthetic AMD (pH 3.6, up to 100 mg/L Mn and 1 g/L Fe, Mn:Fe molar ratio 1:10), while Fe was completely treated, at final pH of 9.7-9.8. In addition, Mn removal was 99.5% within the first 2 h (when pH increased to 8.0), while after 4 h, the efficiency was up to 99.9% (at final pH of 9.6). DO also decreased (from 8 to 2.2 mg/L), at initial Mn concentrations of 1 g/L, and dropped (from 8 to 0.7 mg/L), when Fe concentrations increased to 1 g/L (Mn:Fe molar ratio 1:10). Based on these findings, half-charred dolomite seems a promising option for the treatment of Mn in both AMD and NMD.
机译：在酸性矿锰(Mn)的治疗排水(AMD)和中性的矿井排水(NMD)容易表现的变化,视情况而定有几个因素,包括pH值、Mn和溶解氧浓度,催化Mn - /铁(Fe)固体,配体的存在,细菌。技术和科学进步、锰删除,仍是出了名的困难因为其复杂的化学和挑战性高溶解性。和NMD,发生以氧化物的形式,与之前氧化锰(III)和Mn (IV),或碳酸盐和硫化物。同时有限的效率治疗Mn和其他金属在AMD / NMD,需要二次治疗除锰。修改的自然或剩余材料发现NMD的有效治疗。背景下,本研究评估的性能half-charred白云石在750℃(1 h)的批处理测试(固体,液体的比例3 g: 400毫升)Mn在AMD和NMD接受治疗。修改后的白云石对待Mn在98%以上合成NMD (pH值6.1 - -6.3,1 g / L Mn),最后的pH值9.7 - -10.6。除锰合成AMD还发现(pH值3.6, 100 mg / L Mn和1 g / L铁、锰:铁摩尔比1:10),而菲完全治疗,最后的pH值9.7 - -9.8。99.5%在第一2 h(当pH值增加8.0),而4 h后,效率99.9%(在最后的pH值9.6)。(从8到2.2 mg / L),在最初的锰浓度为1 g / L,(从8到下降0.7 mg / L),当铁浓度增加到1g / L (Mn:铁摩尔比1:10)。发现,half-charred白云石似乎是一个有前途的选择的治疗在AMD和锰NMD。

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