The invention discloses a method and
system for treating
metallurgical slag. The method comprises the steps that the
metallurgical slag, limestone and adhesives are subjected to forming treatment, so that first material
pellets are obtained; oxidizing
roasting is conducted on the first material
pellets, so that
fayalite in the
metallurgical slag is converted into
ferric oxide, and meanwhile oxidizing
roasting products are obtained through desulfurization; the oxidizing
roasting products are crushed, so that crushed oxidizing roasting products are obtained; the crushed oxidizing roasting products, reducing
coal, the adhesives and water are subjected to forming treatment, so that second material
pellets are obtained; reducing roasting is conducted on the second material pellets, so that the
iron oxide in the second material pellets is converted into iron, and meanwhile reducing roasting products are obtained through desulfurization; and ore
grinding and
magnetic separation are conducted on the reducing roasting products, so that
metal iron powder and
tailings are obtained. By the adoption of the method, the problem that reduction of
fayalite in the metallurgical
slag is difficult is solved, effective separation of the iron element is achieved, and high-quality low-
sulfur metal iron powder can be obtained advantageously.