NON-FERROUS SMELTING SLAG TREATMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a non-ferrous smelting slag treatment method for effectively removing impurities such as As from copper smelting slag without adding metallic copper.SOLUTION: A non-ferrous smelting slag treatment method includes the steps of: adding an iron-containing material and a carbon-containing material to non-ferrous smelting slag containing 0.1 to 5 mass% As in the form of a compound having one or more oxidation number and 0.5 to 5 mass% Cu in the form of a compound having one or more oxidation number as well as Fe in the form of a compound having one or more oxidation number to melt the non-ferrous smelting slag in the coexistence of the added iron-containing material and carbon-containing material in order to reduce Fe, As, and Cu contained in the slag; and removing the reduced As and Cu from the slag together with the reduced Fe by gravity separation to obtain purified slag having an As content of less than 0.05 mass% and a Cu content of less than 0.5 mass%.SELECTED DRAWING: Figure 1