Abstract
The fluidized leaching process of calcified vanadium slag clinker was studied in a particulate fluidized bed reactor. The particle size distribution of the clinker was determined and seven size fractions were divided for the experiments. The critical velocity and entrainment velocity of different size fractions were firstly calculated. The effects of clinker particle size on the apparent fluidization velocity, residence time and vanadium leaching rate were investigated. The results show that the critical fluidization velocity and residence time distribution of different particle size fractions are quite different, and there exists significant short circuit or channeling which needs to be treated by stages. The best vanadium leaching efficiency of 94% can be obtained for particles lower than 39 μm, with the residual vanadium content of the tailing at 0.54%.
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