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Agglomeration in the fluidized bed roasting of zinc sulphide concentrate was investigated in a continuous pilot-scale fluidized bed roaster. Alone or together, low stoichiometric excess oxygen (<10%) and high temperature (>940°C) contributed most significantly to agglomeration of zinc calcine particles. Only one test – with 0% excess oxygen at 940°C – led to severe agglomeration and subsequent...
At less than 650°C, the oxidation of lead sulfide (PbS) with oxygen to produce lead sulfate (PbSO 4 ) was found to have a very low activation energy of 10kJ/mole, a reaction order with respect to oxygen of ∼0.5, and one with respect to sulfur dioxide of 0, though the presence of sulfur dioxide was necessary to sustain the reaction. These kinetic parameters suggest that the rate-limiting step...
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