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Treatment of manganese, in the presence or absence of iron, in acid and neutral mine drainage using raw vs half-calcined dolomite
Minerals Engineering ( IF 4.9 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.mineng.2020.106666
Iuliana Laura Calugaru , Thomas Genty , Carmen Mihaela Neculita

Abstract Efficient removal of Mn from mine drainage is complex because of its high solubility minerals, especially in the presence of Fe. This study evaluates the comparative efficiency of raw and half-calcined dolomite for Mn removal in synthetic and real contaminated neutral drainage (CND) as well as in real acid mine drainage (AMD). Batch isotherms were used to evaluate the removal of Mn by raw and half-calcined dolomite, in the presence or the absence of Fe, in synthetic CND and in synthetic AMD. Batch kinetics tests were also performed, only for synthetic CND, in the absence of Fe. Raw dolomite showed limited efficiency in batch tests. Hence, only the half-calcined dolomite was used in column tests. Removal of Mn from synthetic CND (pH 6.84; 46.1 mg/L Mn) was effective for 106 days. For the following 119 days of monitoring, Mn was treated ≥95%. For Mn removal in real AMD (pH 2.40; 22.8 mg/L Mn and 679 mg/L Fe), half-calcined dolomite proved less effective. After 1 week, Mn, Ni and Zn were no longer treated, whereas after 3 weeks, the pH and the concentration of Cu in the final effluent were also no longer conform to the Canadian discharge criteria. In the same time, Co, Cr and Fe were still removed even after 8 weeks. For the real CND, Mn concentration decreased by >90% (0.65 mg/L at the inlet and 0.05 mg/L at the exit) with half-calcined dolomite. Therefore, half-calcined dolomite seems highly promising for the treatment of Mn in CND.

中文翻译:

使用生白云石和半煅烧白云石处理酸性和中性矿井排水中的锰,在有或没有铁的情况下

摘要 由于锰具有高溶解度的矿物质,特别是在铁存在的情况下,从矿山排水中有效去除锰是一项复杂的工作。本研究评估了生白云石和半煅烧白云石在合成和实际污染中性排水 (CND) 以及实际酸性矿山排水 (AMD) 中去除锰的比较效率。使用分批等温线来评估在存在或不存在 Fe 的情况下,在合成 CND 和合成 AMD 中,原料和半煅烧白云石对锰的去除。还进行了批量动力学测试,仅针对合成 CND,在没有 Fe 的情况下。原始白云石在批量测试中表现出有限的效率。因此,柱测试中仅使用半煅烧白云石。从合成 CND(pH 6.84;46.1 mg/L Mn)中去除 Mn 可有效 106 天。在接下来的 119 天的监测中,Mn被处理≥95%。对于实际 AMD(pH 2.40;22.8 mg/L Mn 和 679 mg/L Fe)中的锰去除,半煅烧白云石证明效果较差。1 周后,不再处理 Mn、Ni 和 Zn,而 3 周后,最终出水的 pH 值和铜浓度也不再符合加拿大排放标准。同时,即使在 8 周后,Co、Cr 和 Fe 仍被去除。对于真正的 CND,使用半煅烧白云石时,Mn 浓度降低了 >90%(入口处为 0.65 mg/L,出口处为 0.05 mg/L)。因此,半煅烧白云石对于处理 CND 中的 Mn 似乎很有希望。最终流出物中的 pH 值和铜浓度也不再符合加拿大排放标准。同时,即使在 8 周后,Co、Cr 和 Fe 仍被去除。对于真正的 CND,使用半煅烧白云石时,Mn 浓度降低了 >90%(入口处为 0.65 mg/L,出口处为 0.05 mg/L)。因此,半煅烧白云石对于处理 CND 中的 Mn 似乎很有希望。最终流出物中的 pH 值和铜浓度也不再符合加拿大排放标准。同时,即使在 8 周后,Co、Cr 和 Fe 仍被去除。对于真正的 CND,使用半煅烧白云石时,Mn 浓度降低了 >90%(入口处为 0.65 mg/L,出口处为 0.05 mg/L)。因此,半煅烧白云石对于处理 CND 中的 Mn 似乎很有希望。
更新日期:2021-01-01
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