The fluidized bed roasting of molybdenum trisulfide cake which is a by-product at the chemical processing plant of tungsten ore in Sangdong, Korea has been studied.
The molybdenum trisulfide cake with an organic bridging liquid was agglomerated into spherical granules in a rotating drum. The agglomerated granules with 35 to 200 mesh in size were roasted in a fluidized bed using preheated air.
Under the constant air temperature condition, the effect of granule size and bed height on the degree of desulfurization were investigated, and it was found that the granules with 150 to 200 mesh and the bed with 9.75 ㎝ height, 1（1/2） times of the bed diameter, gave the best results.
Near 1,000 ℉ of bed temperature, the bed became defluidized and sintered. However, at lower bed temperature than 1,000 ℉, could the granules be dead roasted.
It was concluded that the proposed agglomeration fluidized-roasting method could be applied to molybdenum trisulfide cake in the large scale.