C(=O)=[O:2].[S:4](=[O:6])=[O:5].C(=O)(O)[O-:8].[Mg+2:11].C(=O)(O)[O-:13]>>[S:4](=[O:8])([OH:6])[O-:5].[Mg+2:11].[S:4](=[O:13])([OH:6])[O-:5].[S:4]([O-:2])([O-:6])=[O:5].[Mg+2:11]contacting at least a portion of the particles of combusted oil shale with an aqueous leaching agent containing sufficient dissolved carbon dioxide and sulfur dioxide for forming an enriched solution containing dissolved magnesium bicarbonate, and insufficient sulfur dioxide for forming magnesium bisulfite or magnesium sulfite; and
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