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|The Imperial Smelting Process Smelter at Sulphide Corporation is one of the earliest plants of its type, and over twenty-eight years of operation the annual output has almost doubled. This has been achieved through continuing development of the component processes, with several innovations introduced by Sulphide Corporation now being used by other licensees of the process. Main development trends have been: 1. Adapting aspects of iron blast furnace technology to the Imperial Smelting Furnace. 2. Change to the use of mixed concentrates and residues as feed materials, with development of sintering techniques to handle these materials. 3. Increasing byproduct recovery and processing to yield value-added products whenever practical. Planned development includes trials of a continuous slag fuming process, and expanding smelter output to 95 000 try of zinc.|