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      • Mineral carbonation of slate and red mud mixture

        ( Yue Zhao ),( Seon Won Rna ),( Ho Young Jo ) 대한지질공학회 2015 대한지질공학회 학술발표회논문집 Vol.2015 No.2

        Mineral carbonation is a technology using materials having high content of alkaline earth elements (e.g., Ca and Mg) to sequester permanently CO2 as a form of carbonate minerals. Waste slate contains mainly cement and asbestos materials, which are sources of Ca and Mg, respectively. Red mud is bauxite residue after extracting aluminum from bauxite. Red mud is highly alkaline material because sodium hydroxide (NaOH) is added to extract aluminum from bauxite. The pH of the solution leached from red mud is approximately higher than 12. The purpose of this study is to evaluate the feasibility of using red mud as a pH control agent for aqueous mineral carbonation of waste slate. The leaching tests on waste slate and red mud using 1 M ammonium acetate (CH3COONH4) solution and deionized (DI) water, respectively, were conducted. In addition, direct and indirect carbonation tests on waste slate and red mud mixture were conducted. Ca was leached approximately 30% from the waste slate in the 1 M CH3COONH4 solution. pH of the solution leached from red mud using DI water was approximately 11, regardless of a red mud dosage. For the carbonation test on the waste slate and red mud mixture, approximately 98% of Ca was removed from the mixture after carbonation, suggesting that approximately 35% of the carbonation efficiency. The CaCO3 content of the reacted materials determined using results of thermogravimetric analysis (TGA) was approximately 22% ~ 39% higher than that of the unreacted materials. The results of this study suggest that red mud can be used as a pH control agent for aqueous mineral carbonation of waste slate using an acid solution as a solvent.

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