To achieve the carbon peak and neutrality targets,facilitate low-cost disposal of industrial solid wastes(namely semi-coke ash),and develop new green and low-carbon composite materials,carrying out carbon capture using semi-coke ash is proposed,based on the existing semi-coke ash/sodium nitrate composite phase change heat storage materials.The performance of semi-coke ash and composite phase change heat storage materials before and after carbon sequestration is studied.The results indicate that,the optimal conditions for carbon sequestration in semi-coke ash are:gas composition of 20％CO2/80％N2,ventilation time of 40 minutes,and heating temperature of 650 ℃.Under the optimal experimental conditions,the carbon sequestration rate of semi-coke ash reaches 29.27％.The optimal mass ratio of the resulting composite phase change heat storage material,namely the carbon-sequestered semi-coke ash to NaNO3 is 5:5.It achieves a heat storage density of 288.65 J/g at 100～380 ℃,with better mechanical properties,thermal stability,and chemical compatibility.The use of carbon-sequestered semi-coke ash as a skeletal material to prepare composite phase change heat storage materials is highly feasible,providing a new approach for the resource utilization and carbon emission treatment of industrial solid wastes,namely semi-coke ash.
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