Alkaline digestion of dunite for Mg(OH) 2 production: An investigation for indirect CO 2 sequestration

•Dunite can be almost fully substituted with Mg(OH)2.•The digestion of dunite was favoured by the increase of NaOH concentration in solution.•The digestion of dunite was favoured by the increase of temperature and duration of reaction.•A maximum of 80wt% Mg(OH)2 formed in the product of reaction.•Maximum yield of MgO conversion into Mg(OH)2 was 66%.