Abstract
In this report, the vanadium recovery mechanisms by novel BaCO3/CaO composite additive roasting and acid leaching technology, including the phase transformations and the vanadium leaching kinetics, were studied. The purpose of this manuscript is to realize and improve the vanadium recovery from stone coal using BaCO3/CaO as the composite additive. The results indicated that during the composite additive BaCO3/CaO roasting process, the monoclinic crystalline structure of muscovite (K(Al,V)2[Si3AlO10](OH)2) was converted into the hexagonal crystalline structure of BaSi4O9 and the tetragonal crystalline structure of Gehlenite (Ca2Al2SiO7), which could, therefore, facilitate the release and extraction of vanadium. Vanadium in leaching residue was probably in the form of vanadate or pyrovanadate of barium and calcium, which were hardly extracted during the sulfuric acid leaching process. The vanadium leaching kinetic analysis indicated that the leaching process was controlled by the diffusion through a product layer. The apparent activation energy could be achieved as 46.51 kJ/mol. The reaction order with respect to the sulfuric acid concentration was 1.1059. The kinetic model of vanadium recovery from stone coal using novel composite additive BaCO3/CaO could be finally established.
Highlights
Vanadium plays important roles in many fields, such as ferrous and nonferrous alloy production [1], thermistors [2], and catalysts [3]
The results indicated that the maximum vanadium recovery of 95%
The results indicated that the vanadium leaching efficiency increased with the increase of the BaCO3 /CaO total weight from 1 to 5 wt %
Summary
Vanadium plays important roles in many fields, such as ferrous and nonferrous alloy production [1], thermistors [2], and catalysts [3]. 3/CaO, based on their similar characteristics in the same main groupcomposite element, was used BaCO for the vanadium recovery from the characteristics in the same main group element, was used for the vanadium recovery from the representative refractory stone coal [16]. Further investigations on the vanadium recovery mechanisms, based on the intensive systematic discussion of the experimental conditions, are definitely mechanisms, basedand on promote the intensive systematicof discussion of the experimental required to explain the application the composite additive, includingconditions, the analysisare of definitely required to explain and promote the application of the composite additive, including the the crystal transformation relationship and the vanadium leaching kinetics. The phase transformations were studied and the leaching kinetic model was established to reveal the vanadium recovery mechanisms and, further improve the recovery effect.
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