Sustainable Mining and Metallurgy

At present, there is a huge amount of coal gangue, which can be made into ceramsite instead of sand aggregate to achieve mass consumption. Using coal gangue as the main raw material, the experimentals study on the preparation of ceramite with desulfurized gypsum, limestone and dolomite were carried out. The results showed that when the raw ball made of 90% coal gangue and 10% desulphurized gypsum was calcined at 1150℃ for 60min, the packing density of the prepared ceramsite was 729.80kg/m3, the water absorption rate was 2.49%, and the barrel compression strength was 8.15MPa; When the raw ball made of 90% coal gangue combined with 10% limestone was calcilled at 1150℃ for 60min, the packing density of the prepared ceramsite was 686.00kg/m3, the water absorption rate was 1.43%, and the barrel compression strength was 8.30MPa; When the raw ball made of 90% coal gangue and 10% dolomite was calcined at 1150℃ for 60min, the packing density of the prepared ceramsite was 721.44kg/m3, the water absorption rate was 5.40%, and the barrel compression strength was 9.39MPa. The properties of these three kinds of ceramsite can meet the requirements of national standards for high strength ceramsite.