Abstract
Converter vanadium slag is a byproduct of the iron making process when the vanadium titanomagnetite is used as iron raw material. A cleaner process including calcified roasting, dilute acid leaching, precipitation purification, vanadium precipitation with ammonium salt, followed by thermal decomposition was proposed to extract vanadium resource from this slag. And then vanadium pentoxide with purity over 98% was prepared, which can be used as additives for high strength low alloy steel production. A total vanadium recovery beyond 80% was achieved in this whole process. Since no sodium and potassium salt was introduced, wastewater generated was closed-circulating after removing the enriched impurities of P, Si, Ti and Cr with adding powder CaO. The content of V2O5 in residues after vanadium extraction was lower than 1.2 wt.%, while other valuable metals like Fe, Mn, Cr and Ti were concentrated. With no alkaline metal salts added in this process, the metal resources of Fe, Mn, Cr and Ti in the residues were more feasible to be recovered with pyrometallurgy processes.
Highlights
As a very important material, vanadium is widely applied in the iron and steel industry, aviation and aerospace, chemical and pharmaceutical industry
A cleaner process including calcified roasting, dilute acid leaching, precipitation purification, vanadium precipitation with ammonium salt followed by thermal decomposition was proposed to extract vanadium resource from the converter vanadium slag, and this process was evaluated in respective of vanadium recovery, quality of the vanadium pentoxide product and its influence imposed on environment
Vanadium precipitation step was conducted at pH 2.00 ± 0.05 and temperature of 95 ◦ C, ammonium sulfate was added at molar ratio (NH3 )/(V)
Summary
As a very important material, vanadium is widely applied in the iron and steel industry, aviation and aerospace, chemical and pharmaceutical industry. The conventional process of sodium salt roasting followed by water leaching for vanadium extraction from the vanadium slag is mature and operationally steady. It seriously pollutes the environment, and has difficulties in comprehensive utilization of the leaching residue and in the recycling of wastewater, which contains high concentration of sodium. A cleaner process including calcified roasting, dilute acid leaching, precipitation purification, vanadium precipitation with ammonium salt followed by thermal decomposition was proposed to extract vanadium resource from the converter vanadium slag, and this process was evaluated in respective of vanadium recovery, quality of the vanadium pentoxide product and its influence imposed on environment
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