METHOD OF ELUTING CALCIUM FROM STEELMAKING SLAG AND METHOD OF RECOVERING CALCIUM FROM STEELMAKING SLAG

摘要

PROBLEM TO BE SOLVED: To provide a method for eluting Ca from a steelmaking slag capable of eluting a large amount of Ca from a steelmaking slag into an aqueous solution containing carbon dioxide.SOLUTION: A step in which compounds containing iron are removed from steelmaking slag by applying magnetic separation to the steelmaking slag and a step in which the steelmaking slag subjected to the magnetic separation is brought into contact with an aqueous solution containing carbon dioxide are performed in this order. Further, the steelmaking slag is brought into contact with the aqueous solution containing carbon dioxide while the steelmaking slag is pulverized or surface of the steelmaking slag is ground. Through these methods, a large amount of Ca can easily be eluted from the steelmaking slag into the aqueous solution containing carbon dioxide.SELECTED DRAWING: Figure 1