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.