Technical feasibility study of unfired brick with coal gangue at the Wulanmulun site, Inner Mongolia, China

Study on the Reactivity Activation of Coal Gangue for Efficient Utilization

“…Faced with the present situation of the severe global resources environment situation, the demand for low-carbon and sustainable development, and the current shortage in construction and building materials, researchers have made many explorations into the efficient utilization of coal gangue as a substitute for the construction materials, such as backfilling in mining areas [ 11 , 12 , 13 , 14 ], as roadbed materials and concrete aggregates [ 15 , 16 , 17 , 18 , 19 ], preparing unburned bricks, etc. [ 20 ]. However, the utilization methods of coal gangue mentioned above have problems such as insufficient coal gangue consumption capacity, difficulty in controlling product quality, and low added value of products.…”

“…The focus of current studies is to optimize the ratio of activated coal gangue powder and other types of industrial solid waste mixtures to improve their utilization rate [ 24 ]. With an activated coal gangue content of 75%, Yu et al [ 20 ] have prepared bricks satisfying the requirements without high-temperature calcination by mixing slag and cement clinker. Huang et al [ 25 ] and Koshy et al [ 26 ] added blast furnace slag and quicklime to increase the calcium content of the coal gangue cementitious system, and the compressive strength of the mortar specimens after 28 days reached 57.83 MPa by chemical activation with sodium hydroxide and sodium silicate.…”

“…Materials 2023, 16, 6321 2 of 18 preparing unburned bricks, etc. [20]. However, the utilization methods of coal gangue mentioned above have problems such as insufficient coal gangue consumption capacity, difficulty in controlling product quality, and low added value of products.…”