A carbonation/granulation process for treating mine tailings using a MgO/ground-granule blast-furnace-slag (GGBS) binder was developed. The materials were mixed and granules produced using a granulator, then the granules were cured in a CO atmosphere. The optimum granulator rotation speed and retention time were 60 rpm and 7 min, respectively. The binder composition MgOGGBS and binder: mine tailings ratio 3:10 gave the strongest granules. Carbonation generally increased the granule strength, but different CO concentrations, between 0.04% and 100%, changed the granule strength to different degrees. Granules cured in 20% CO for 28 d had a strength of 4.71 MPa, which was higher than the strengths of granules cured in other CO concentrations and of granules produced using Portland cement. The granules had relatively high CO storage capacities of 0.157-0.167 kg CO/kg binder and good acid-neutralizing capacities (higher than the acid-neutralizing capacity of granules produced using Portland cement). The strength of the granules cured in 20% CO for 28 d was probably mainly attributed to the formation of hydromagnesite during carbonation. The hydromagnesite contributed dense and connected structures within the granules. The granules produced show great potential for use as aggregates for reclamation work and backfilling in mining areas.
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