Process for modifying steel slag through acidification and carbonization coupling

A process for modifying steel slag through acidification and carbonization coupling, wherein acetic acid, tributyl phosphate, ethanolamine and a NaOH and Ca(OH)2 emulsion are used as reaction reinforcing agents, and the steel slag is modified together with CO2-rich lime kiln flue gas;

• the process for modifying the steel slag through acidification and carbonization coupling specifically comprises the steps of sequentially adding water and acetic acid solid to the steel slag, mixing and reacting for 20-60 min, then introducing the lime kiln flue gas containing CO2 gas, and meanwhile, and adding the tributyl phosphate, the NaOH and Ca(OH)2 emulsion and the ethanolamine for acidification and carbonization coupling reaction;
• when the water and the acetic acid solid are sequentially added to the steel slag, the water amount is controlled according to the liquid-solid ratio of 20:1 to 5:1, and the concentration of the acetic acid is controlled to be 5% to 20%;
• the final total amount of the tributyl phosphate is the same as the molar mass of the added acetic acid;
• the amount of the NaOH and Ca(OH)2 emulsion is required to adjust the pH value of liquid between 8 and 11;
• and
• the amount of the ethanolamine is 5% to 20%.