Pangang later built two other similar EAFs for ilmenite smelting, bringing its total capacity to 180 kt/a sulfate slag and about 80 kt/a pig iron [26]. Pangang's slag contains about 75% wt. TiO 2 . Most of it is used for the production of sulfate TiO 2 pigment, but a considerable portion is used in Panzhihua for the production of titanium sponge via molten salt chlorination (capacity: 20 kt/a