Abstract The direct aqueous mineral carbonation of carbide slag was investigated. The flow characteristics of carbide slag-CO2-water reaction system in a bubble column were studied, which included the bubble Sauter mean diameter, gas holdup, bubble residence time, and the gas-liquid interfacial area. Bubble flow behaviors in the reactor were characterized by analyzing the bed pressure signals. The effects of the gas velocity (U g ) and liquid to solid ratio (L/S ratio) were discussed and analyzed. The results showed that the larger bubbles were easy to form at the larger L/S ratio, which indicated that the bubble coalescence was promoted. The gas holdup was larger when increasing U g or reducing the L/S ratio. The better gas-liquid interfacial areas were found in a wide range of L/S ratio at U g  = 0.082 m/s. The optimum conditions were found at U g  = 0.082 m/s and L/S ratio = 15–30 mL/g for the better gas-liquid interfacial area and the higher carbide slag conversion. The work provided the theoretical basis for the direct aqueous carbonation of the carbide slag and the operation condition optimization.

中文翻译：

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气泡塔碳酸化反应器中电石渣浆料流动特性

摘要 研究了电石渣的直接含水矿物碳酸化。研究了气泡柱中电石渣-CO2-水反应体系的流动特性，包括气泡索特平均直径、含气量、气泡停留时间和气液界面面积。通过分析床压力信号来表征反应器中的气泡流动行为。讨论和分析了气体流速（U g ）和液固比（L/S 比）的影响。结果表明，较大的气泡在较大的L/S比下容易形成，这表明促进了气泡的聚结。当增加U g 或降低L/S 比时，含气量较大。在 U g = 0.082 m/s 时，在较大的 L/S 比范围内发现了较好的气液界面面积。最佳条件是 U g = 0.082 m/s 和 L/S 比 = 15-30 mL/g 以获得更好的气液界面面积和更高的电石渣转化率。该工作为电石渣直接水相碳化及操作条件优化提供了理论依据。082 m/s 和 L/S 比 = 15-30 mL/g 以获得更好的气液界面面积和更高的电石渣转化率。该工作为电石渣直接水相碳化及操作条件优化提供了理论依据。082 m/s 和 L/S 比 = 15-30 mL/g 以获得更好的气液界面面积和更高的电石渣转化率。该工作为电石渣直接水相碳化及操作条件优化提供了理论依据。