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首页> 外文期刊>Metals >Effects of Experimental Parameters on the Extraction of Silica and Carbonation of Blast Furnace Slag at Atmospheric Pressure in Low-Concentration Acetic Acid
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Effects of Experimental Parameters on the Extraction of Silica and Carbonation of Blast Furnace Slag at Atmospheric Pressure in Low-Concentration Acetic Acid

机译：实验参数对低浓度乙酸常压下高炉渣二氧化硅的提取和碳化的影响

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Blast furnace slag (BFS), a calcium-rich industrial byproduct, has been utilized since 2005 as a mineral carbonation feedstock for CO 2 sequestration, producing calcium carbonate precipitates. In this study, the conditions for the dissolution of Ca and Si in acetic acid, and subsequent carbonation, were elaborated. For this purpose, the retardation of the polymerization of silicon was attempted by varying the concentration of acetic acid, temperature, and leaching time. An inductively coupled plasma (ICP) analysis revealed that both the Ca and Si dissolved completely within 30 min in 5% acetic acid at room temperature. This high dissolution value can be attributed to the fact that Ca was bound to O rather than to Si, as determined by X-ray photoelectron spectroscopy (XPS). The use of CO 2 -absorbed monoethanolamine enabled the complete carbonation of BFS at ambient conditions without the need for a pH swing. The presence of dissolved silica was found to affect the polymorphs of the precipitated CaCO 3 . We believe that this process offers a simple method for manipulating the composites of products obtained by mineral carbonation diminishing the leaching residues.
机译：自2005年以来，高钙工业副产品高炉矿渣（BFS）就被用作矿物碳酸化原料，用于CO 2隔离，产生碳酸钙沉淀物。在这项研究中，详细说明了将Ca和Si溶解在乙酸中以及随后进行碳酸化的条件。为此目的，通过改变乙酸的浓度，温度和浸出时间来尝试延迟硅的聚合。电感耦合等离子体（ICP）分析显示，室温下，Ca和Si均在30分钟内完全溶解在5％乙酸中。如X射线光电子能谱（XPS）所确定的，该高溶解值可归因于Ca与O而不是Si结合的事实。使用吸收了CO 2的单乙醇胺可以在环境条件下实现BFS的完全碳酸化，而无需调节pH。发现溶解的二氧化硅的存在影响沉淀的CaCO 3的多晶型物。我们认为，该方法提供了一种简单的方法来处理通过矿物碳化减少浸出残留物而获得的产品复合材料。

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