Abstract: Aiming at the problem of high density and low strength of traditional aggregates, in order to realize the resource utilization of industrial solid waste and CO₂ after capture, using blast furnace slag and fly ash as raw materials, the effects of solid waste proportion, remaining water-solid ratio, and maintenance pressure on the barrel compression strength, carbon sequestration rate, and the stacking density of lightweight aggregates were investigated to obtain the preliminary formulations and maintenance regimes, and the results showed that, the stacking density rapidly decreased from 1 016 kg/m³ to 883 kg/m³ by 13% when increasing fly ash content from 0 to 60%, and both barrel compression strength and carbon sequestration rate showed a first increase and then a decrease of 13%. Density rapidly decreased from 1016 kg/m³ to 883 kg/m³, a decrease of 13%, and continued to increase the fly ash content, the change in bulk density was not significant, while the barrel compression strength and carbon sequestration rate showed a trend of increasing and then decreasing; by adjusting the residual water-solids ratio and the maintenance pressure, it was found that there existed an optimum residual water-solids ratio （0.15） and the maintenance pressure （0.1 MPa） so that the aggregates could obtain the best barrel compression strength; the carbon sequestration rate increased with the residual water-solids ratio and maintenance pressure. strength; the carbon sequestration rate decreased with the increase of residual water-solid ratio and increased with the rise of curing pressure. On this basis, the effects of three different alkali exciters, sodium hydroxide, calcium hydroxide and water glass, on the lightweight aggregate samples under mineralized curing conditions were investigated. The results showed that 5% calcium hydroxide optimally enhanced the barrel compression strength performance （7.6 MPa） and significantly improved the carbon sequestration rate of the material （5.09%）. Through XRD and SEM analysis, it was concluded that the main mineralization products were calcium carbonate and existed in the form of calcite, and the higher maintenance pressure was easy to lead to the appearance of fine cracks at the interface of the products; through the MIP analysis, it could be seen that the mineralization products had a filling effect on the pore space of less than 100 nm, and due to the exothermic reaction of the product in the early stage of the mineralization reaction caused by the volume expansion of the product made the increase of pore space of more than 1 000 nm, and the change of porosity shows the great improvement of the microporous structure by mineralization, which explains the mechanism of strength enhancement by mineralization.