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Fluid bed roaster, also known as fluidized-bed roaster, roaster for short. Solid Fluidization technology of the roasting of sulfide ores used devices. Roasting process of reaction heat output, produces gas containing sulphur dioxide mainly used to manufacture sulfuric acid slag is used as a metallurgical raw materials. Technology of fluidized roasting of sulfide ores is early 50 federal Germany Baden aniline and soda companies United States Thor are developed