Thermodynamic Calculation and Analysis of Steel Slag for CO2 Sequestration
Steel slag is generated from steelmaking process, and it is similar to cement clinker in phase composition. However, steel slag has not been effectively utilized because of its high free CaO content. A series of chemical reactions will occur when steel slag is modified by using H2O and CO2. In this paper, the characteristics of the modified reactions were analyzed based on thermodynamic principle. Thermodynamic investigation shows that for the same phase in steel slag, CO2 is preferred than H2O in reaction with that. The Gibbs free energy change of f-CaO in steel slag reacting with H2O and CO2 is negative at a certain temperature and is the smallest, that is, f-CaO is the most unstable. By comprehensive comparison, the Gibbs free energy change of the reaction of CO2 with f-CaO is the smallest.
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Document Type: Research Article
Publication date: September 1, 2018
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