Abstract
In this study, an attempt was made to recover vanadium from an alkaline solution using the precipitation process. A white salt ammonium metavanadate was obtained using the ammonium chloride precipitation method. Ammonium chloride was added directly to the alkaline liquor solution and the pH was adjusted approximately between 5 and 7 to form the white salt. The parameters affecting the recovery of vanadium, including the ammonium chloride concentration, the pH and the vanadium concentration in the caustic solution, were examined. The precipitation time had no significant influence on the vanadium recovery. The concentration of vanadium in the caustic solution and the concentration of ammonium chloride used for the precipitation were inversely related. It was found that a high recovery (over 90%) can be achieved with ammonium chloride and vanadium with concentrations over 4% (w / v) or 1000 mg L-1 (in the lye solution). It has also been observed that working in the pH range of 5 to 7 results in over 90% recovery. The influence of the parameters mentioned on the recovery of impurities was examined and the optimal values determined. Ultimately, the maximum vanadium recovery (97.29%) was achieved at the optimal point obtained from the reaction surface methodology.
Highlights
Vanadium is of industrial and strategic importance due to its particular use
Sodium hexavanadate Na4V6O17 can be Response Surface Methodology for Recovery of Vanadium precipitated by adding sulfuric acid with a pH of 2-3, and the precipitate is dissolved in an aqueous sodium carbonate solution
We find from the results in Table 3. that a vanadium recovery of 98% with a vanadium concentration of 1000 mg L-1 can be achieved in the presence of 2.5% ammonium chloride
Summary
Vanadium is of industrial and strategic importance due to its particular use. The main application of this element is in the steel industry. In the alkaline leaching process, sodium hydroxide was precipitated by adjusting the pH to 8 with sulfuric acid in the absence of ammonium chloride, aluminum, and silicon, while vanadium was in the solution. The precipitation of vanadium can be achieved by adding ammonium chloride and an alkali such as sodium hydroxide to an acidic leach solution to adjust the pH. In the recovery of vanadium from the acidic leach solution of charcoal, scholars could obtain vanadium pentoxide with a purity of 99%. It was found that the concentrations of vanadium pentoxide in the leach solution and ammonium chloride are heavily involved in the vanadium precipitation process and are interdependent. The important parameters including ammonium chloride concentration, pH, precipitation time and vanadium concentration in the leach solution were investigated and their optimal values were specified
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