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首页> 外文期刊>Environmental Science & Technology >Carbonation, Cementation, and Stabilization of Ultramafic Mine Tailings
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Carbonation, Cementation, and Stabilization of Ultramafic Mine Tailings

机译：超空地矿山尾矿的碳化，胶结和稳定

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Tailings dam failures can cause devastation to the environment, loss of human life, and require expensive remediation. A promising approach for de-risking brucite-bearing ultramafic tailings is in situ cementation via carbon dioxide (CO_2) mineralization, which also sequesters this greenhouse gas within carbonate minerals. In cylindrical test experiments, brucite [Mg(OH)_2] carbonation was accelerated by coupling organic and inorganic carbon cycling. Waste organics generated CO_2 concentrations similar to that of flue gas (up to 19%). The abundance of brucite (2-10 wt %) had the greatest influence on tailings cementation as evidenced by the increase in total inorganic carbon (TIC; +0.17-0.84%). Brucite consumption ranged from 64-84% of its initial abundance and was mainly influenced by water availability. Higher moisture contents (e.g., 80% saturation) and finer grain sizes (e.g., clay-silt) that allowed for a better distribution of water resulted in greater brucite carbonation. Furthermore, pore clogging and surface passivation by Mg-carbonates may have slowed brucite carbonation over the 10 weeks. Unconfined compressive strengths ranged from 0.4-6.9 MPa and would be sufficient in most scenarios to adequately stabilize tailings. Our study demonstrates the potential for stabilizing brucite-bearing mine tailings through in situ cementation while sequestering CO_2.
机译：尾矿大坝故障可能导致环境破坏，人类生命丧失，并需要昂贵的修复。通过二氧化碳（CO_2）矿化，对破坏性的布苏塔近外尾矿尾矿的有希望的方法是通过二氧化碳（CO_2）的矿化，这也将该温室气体螯合在碳酸盐矿物质中。在圆柱测试实验中，通过偶联有机和无机碳循环加速了Brucite [Mg（OH）_2]碳酸化。废有机物产生的CO_2浓度类似于烟气的浓度（高达19％）。 Brucite的丰度（2-10wt％）对尾矿胶泥的影响最大，如总无机碳（Tic; + 0.17-0.84％）的增加所证明。 Brucite消费量的初始丰度的64-84％，主要受水供应的影响。允许更好地分布水的水分含量（例如，80％饱和度）和更精细的晶粒尺寸（例如，粘土 - 淤泥）导致更好的水碳化。此外，Mg碳酸盐的孔隙堵塞和表面钝化可能在10周内逐渐变慢了碳酸盐。无凝结的压缩强度范围为0.4-6.9MPa，在大多数情况下都足够了，以充分稳定尾矿。我们的研究表明，在封存CO_2的同时通过原位粘合稳定Brucite矿山尾矿的可能性。

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