Abstract
This chapter proposes a new process of CO2 fixation via carbonation of calcium contents in waste concrete or slag by using a solution of weak base-strong acid salt. The new CO2 fixation process is composed of two steps: extraction of calcium ions by a solution of weak base-strong acid salt from the waste materials and deposition of calcium carbonate from the solution by the reaction with dissolved CO2. Waste concrete or steelmaking slag has been found that it is the suitable material for CO2 fixation because it contains high Ca content. The resulting carbonates can be stored in natural sites and minor fractions can be used in some kinds of applications, such as in the paper or building industry, reducing the cost of the total fixation process. In the new process, selective extraction of alkaline earth metal ions from steelmaking slag and fixation as CaCO3 was carried out under 333-363K.
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