A Method for Preparing CaCO3 With Desulfurization Slag and CO2

摘要

PURPOSE: Provided is a method for preparing calcium carbonate having a high purity, which is an environmental-friendly method by using waste resources, i.e., a desulfurized slag and carbon dioxide or CO2-containing exhaust gas. CONSTITUTION: The method comprises the steps of: crushing desulfurized slag into a size of 45 micrometers or less and adding it to water to elute sulfur component, and separating and removing the sulfur-eluted solution; adding the desulfurized slag from which the sulfur-eluted solution is already removed to water and adjusting the pH to 12 or higher to obtain a calcium-eluted solution having a pH of 12 or higher; and reacting the calcium-eluted solution with CO2 or CO2-containing exhaust gas under a pH of 7 or higher.