Optimizing CO2 capture property of alkali-activated ladle slag materials with sodium dodecyl sulfate

Ladle slag is a kind of metallurgical solid waste with great potential to be used to prepare alkali-activated ladle slag materials (ALS) and to capture CO2 due to its rich Ca and Si minerals. In this investigation, sodium dodecyl sulfate (SDS) was applied to optimize the microstructure of ALS, aiming to improve the CO2 capture property of ALS. The effect of SDS on CO2 capture property, compressive strength, pore structure and mineral evolution of ALS were comprehensively analyzed. The results show that adding SDS improves the CO2 capture property of ALS, and at 0.20 % SDS dosage, the CO2 capture capability of ALS reaches 6.17 %, a 48 % increase over the reference group. However, SDS incorporation decreases the compressive strength of ALS, but benefits for the carbon footprint owing to the improved CO2 capture amount. This study provides a novel direction for optimizing the CO2 capture properties and application of LS.