Effect of Injection Smelting Jet Characteristics on Refractory Wear in the Mitsubishi Process

The Mitsubishi Process is a multi-furnace continuous copper smelting and converting process developed by Mitsubishi Metal Corporation. Developing a furnace lining system to minimize refractory wear in smelting and converting furnaces was one of the major objectives since the pilot plant started operation in 1968. Many efforts were directed toward developing techniques such as thickness control of slag layer, application of water-cooled jackets, fuel combustion control to avoid hot spots, and modification of furnace configuration. These efforts prolonged furnace life by a year, and are expected to extend it to several years in the near future. This paper discusses developments which have reduced refractory wear, and current refractory practice based on recent operating data.