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Performance investigation and optimization of the granulation-CO2 concentration for the production of high-strength BOFS aggregates
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2022-07-30 , DOI: 10.1016/j.jcou.2022.102160
Ao Wang , Pengfei Ren , Qiang Zeng , Tung-Chai Ling

Studies have demonstrated that basic oxygen furnace slag (BOFS) powder can be granulated to produce a strong artificial aggregate through strengthening with accelerated carbonation. However, our previous results showed that a 100% CO2 concentration applied during granulation could significantly degrade the properties of the produced BOFS aggregate due to the loss of bridging water upon undergoing a rapid exothermic reaction. Therefore, this paper aims to optimize the CO2 concentration during granulation of BOFS and investigate the impact on the subsequent post air or CO2 curing of the produced aggregates. According to X-ray computed tomography results, the CO2 applied during granulation should be controlled at 40 vol% or less in order to provide proper connective pores in freshly granulated BOFS aggregates for subsequent carbonation, thereby allowing higher CO2 uptake and better mechanical development of hardened BOFS aggregates. It was also noted that with a high granulation-CO2 concentration typically of 100% can result in the formation of multiple granules in a single produced BOFS aggregate, hence lowering the intrinsic structure and aggregate strength. Compared to the CO2 reaction that occurs during granulation, post CO2 curing plays the main role in developing the mechanical strength of hardened BOFS aggregates.



中文翻译:

高强 BOFS 骨料生产中造粒 CO2 浓度的性能研究与优化

研究表明,碱性氧气炉渣(BOFS)粉末可以通过加速碳化强化来造粒,从而生产出坚固的人造骨料。然而,我们之前的结果表明,在造粒过程中施加 100% 的 CO 2浓度会显着降低所生产的 BOFS 骨料的性能,因为在经历快速放热反应时会损失桥接水。因此,本文旨在优化BOFS 造粒过程中的 CO 2浓度,并研究其对所生产骨料的后续空气或 CO 2固化的影响。根据 X 射线计算机断层扫描结果,CO 2造粒过程中施用的量应控制在 40 vol% 或更低,以便在新造粒的 BOFS 骨料中提供适当的连通孔,用于随后的碳化,从而允许更高的 CO 2吸收和更好的硬化 BOFS 骨料的机械发展。还注意到,通常为 100% 的高造粒 CO 2浓度会导致在单个生产的 BOFS 骨料中形成多个颗粒,从而降低固有结构和骨料强度。与造粒过程中发生的 CO 2反应相比,后 CO 2固化在提高硬化 BOFS 骨料的机械强度方面起主要作用。

更新日期:2022-07-30
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