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Production of artificial aggregates from steel-making slag: Influences of accelerated carbonation during granulation and/or post-curing
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2019-11-19 , DOI: 10.1016/j.jcou.2019.11.009
Yi Jiang , Tung-Chai Ling

Accelerated carbonation is envisaged to be a significant curing method for the development of cement-free artificial aggregates. In this paper, two accelerated carbonation approaches, applied during granulation and post-curing respectively, are investigated for their influences on the properties of the aggregates made by 100 % basic oxygen furnace slag (BOFS). The result shows that carbonation during post-curing significantly enhances the overall properties of the granulated BOFS, such as increasing the strength by 220 %. In contrast, synchronized carbonation applied simultaneously during the granulation process yields considerable property degradation, though a CO2 uptake of ∼16 % can be achieved. It contradicts with the common understanding that carbonation is beneficial to the strength enhancement. This is because synchronized carbonation of BOFS is found to release extensive heat and vaporize a great amount of bridging water for agglomeration, thus causing a very loose structure. In general, synchronized and post-granulation carbonation result in two notably different influences on the properties of BOFS aggregates. The integrated approach of granulation and post-granulation carbonation creates a promising cement-free alternative to the local natural aggregates; while the synchronized carbonation shows significant potential for the production of lightweight aggregates.



中文翻译:

用炼钢炉渣生产人造骨料:造粒和/或后固化过程中加速碳化的影响

加速碳化被认为是开发无水泥人工骨料的重要固化方法。本文研究了分别用于制粒和后固化的两种加速碳化方法,它们对100%碱性氧气炉渣(BOFS)制成的骨料性能的影响。结果表明,后固化过程中的碳化明显增强了颗粒状BOFS的整体性能,例如使强度提高了220%。相比之下,制粒过程中同时施加的同步碳酸化会导致相当大的性能下降,尽管会产生CO 2吸收量约为16%。它与通常的认识相矛盾,即碳化有利于强度的提高。这是因为发现BOFS的同步碳酸化会释放大量的热量,并使大量的桥接水汽化以结块,从而导致结构非常疏松。通常,同步化和造粒后碳化会对BOFS骨料的性能产生两种明显不同的影响。造粒和造粒后碳酸化的综合方法为当地的天然骨料创造了一种有希望的无水泥替代品;而同步碳化显示出生产轻质骨料的巨大潜力。

更新日期:2019-11-19
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