Abstract
Steel slag is a calcium-rich industrial waste. Direct aqueous carbonation is one of the routes to slag carbonation. The reaction mechanism of direct aqueous carbonation of steel slag is first discussed. Various models have been proposed to model aqueous carbonation of steel slag. The merits and shortcomings of these models are discussed. A recently proposed slag carbonation model by Gopinath and Mehra (2016) is discussed in detail. The model considers the armoring of reaction surface by two secondary phases: pore closure in one of these layers due to product precipitation and the kinetics of the reaction at the slag core. The model is analyzed, its advantages and drawbacks are discussed, and further improvements to the model are suggested.
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