Chalcocite flotation concentrates (26 to 34 percent cu and 6 to 7 percent s) were roasted in air to determine sulfur elimination as a function of temperature, airflow rate, and residence time. Fluosolids roasting was evaluated batchwise and continuously in a 4- inch fluid-bed reactor. Kiln roasting tests were carried out in a 4- inch-id by 6-inch-long rotary drum. Pelletizing the very fine concentrates prior to roasting was essential to minimize dust losses and accretions. Concentrate pellets, sized minus 10 plus 20 mesh and bonded with 2 percent bentonite, were excellent feed for fluosolids roasting and limited dust losses to 10 percent or less. One-fourth-inch pellets were best suited to kiln roasting. Both techniques were capable of producing copper calcines analyzing well under 1 percent residual sulfur when operated at 900 deg. C with average retention times of 3 to 4 hours. Calcined pellets were strong, porous, and readily reducible.