Mineral sequestration has a great potential for abating CO 2 emissions, especially at locations where no opportunities for CO 2 geological storage exist. This article focuses on the mineral carbonation of magnesium silicates, that is, serpentinites, which offers an attractive option for CO 2 emission mitigation in Lithuania. Mineral CO 2 carbonation in a staged gas/solid process route is one of the most prospective approaches. The process was conducted in several steps. Firstly, extraction of the magnesium hydroxide from serpentinite via a solid/solid reaction between serpentinite and ammonium sulfate salt at a temperature interval of 500-540 C was carried out. The maximum Mg extraction (53.70 %) was obtained with the mass ratio of reactants of 2 g serpentinite/3 g ammonium sulfate, reaction temperature, and time of 520 C and 20 min, respectively. Secondly, the process of precipitation of Mg(OH) 2 took place. The effect of precipitation of the Fe-containing compounds (first step) and the Mg(OH) 2 (second step) was analyzed. At the pH of 8-10 and 10-12, compounds of Fe and Mg precipitated, respectively. The optimal Fe removal and Mg extraction was achieved at the pH of the $9.5 for the first step and at the pH of $11.50 for the second step. Finally, the carbonation of extracted magnesium hydroxide was accomplished and reached the effectiveness of 65 % after 15 min at 535 C, 51 bar.
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