| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for treating sulfide-based copper-removed slag for selectively separating and recovering sodium, copper and iron from the sulfide-based copper-removed slag containing sodium, iron and sulfur as main components.SOLUTION: The method for treating sulfide-based copper-removed slag includes a heat treatment step in which the sulfide-based copper-removed slag is heat-treated at a temperature of 600°C or higher and 800°C or lower, a sodium separation step in which sodium contained in the copper-removed slag is eluted into an aqueous phase having pH of 5.0 or higher and then, the aqueous phase containing the sodium and a solid phase containing copper and iron are separated, and a copper separation step in which the copper contained in the solid phase is eluted into an aqueous phase having pH of 4.0±0.5 and then, the aqueous phase containing the copper and a solid phase containing the iron are separated. |
