چكيده به لاتين
The elements vanadium (V) and molybdenum (Mo) are intermediate elements that have received much attention due to their many applications. In this study, solvent extraction of V (V) and Mo (VI) from aqueous acid solution simulated to catalysts used in the oil industry containing other metal ions such as Al (III) and Ni (II) with a mixture of cyanide 272 and aliquate 336 diluted in Kreuzen was studied. The response surface methodology (RSM) based on the central composite design (CCD) was used for experimental modeling and optimization to clarify new dimensions of the interaction effects in the solvent extraction process of metal ions. In the extraction step, pH values in the range of 1 to 3 were selected. The results showed that by increasing the pH in the range of 1 to 2%, the extraction increased and the optimal amount of extraction was obtained in the range of 1.8 to 2%. In this range, the amount of extraction reaches 94.3 and finally decreases with increasing the pH from 2 to 3 extractions. In addition, organic phase concentrations from 5 to 25% by volume were investigated. With increasing the concentration of organic phase to a concentration of 20% by volume, the extraction increases and with further increase of the concentration, no significant changes in extraction occur. By examining the McCabe diagram, a step for complete vanadium extraction with R4NCy was predicted. In the recovery phase of vanadium and molybdenum, the effect of factors such as sulfuric acid and ammonia and changes in their concentrations on the recovery of these two metal ions were investigated. For molybdenum, obtained. In this regard, the effect of process parameters such as the concentration of cyanide 272 or aliquate 336 on a continuous scale, the initial pH of the aqueous phase, the diameter of the inlet nozzle and the concentration of vanadium and hydrogen ions and finally the concentration of aliquate 336 and cyanide 272 in a single drop column were investigated. The results of optimization showed that the aliquate 336 extractor has a better performance for extracting and separating vanadium from aqueous solution. In this regard, the extraction efficiency of vanadium reached 99.6%. The results showed that the extraction rate increases with increasing metal ion concentration, nozzle diameter and extractors concentration, while with increasing aqueous phase acidity, the extraction rate decreases.
