Aqua To Organic Ratio Analysis
Figure 9 shows the effect of the phase ratio (aqua-to-organic ratio) of three types of extraction on the recovery of vanadium extraction from the leaching solution. According to the figure, by increasing the ratio of the aqua phase to the organic phase, the percentage of extraction of vanadium was reduced by all three anionic extraction methods. Increasing the aqua-to-organic ratio for two extractors (La-2 amberlite and Alamin 336) causes to a faster reduction in extraction efficiency than aliquot. By increasing this ratio to 5, the extraction efficiency of the three types of aliquot 336, amberlite and alumin 336 has decreased by 60%, 45% and 25%, respectively. Thus, due to the maximum percentage of aliquot 336 extraction in the phase ratio …show more content…
According to the results of the chemical analysis, more than 50% of the slag is composed from lime. One of the problems of lime is the formation of insoluble calcium vanadium in the salt roasting stage, which reduces the recovery of the leaching process. The preliminary leaching results with HCl indicate a reduction in the amount of lime (CaO) from 51.72% to 32.59%. Recovery of preliminary leaching was achieved at 46.98%. The carbonate leaching in the presence of sodium was crushed in the amount of 40 grams per liter at 85 ° C on salt roasting slag to 75 microns, the pH was about 10 and time was 60 minute which lead to 94.93% recovery of vanadium. By increasing pH in solvent extraction experiments, the extraction rate of vanadium was increased by aliquot 336 and was reached to maximum and constant values at pH=6. However, two extractors, alamin 336 and amberlite LA-2 have a maximum extraction value at pH=3.5 and pH=2.5 respectively. In addition, the second type amine, Amberlite-LA2 and Alamin336 which is the third-type amine, has been operated better than aliquot 336 in the pH range between 1.5 to and 4-3, respectively. The results also showed that increasing in the aqua-to-organic ratio reduced the extraction rate, especially for the second and third type amines. Also, increasing the concentration of aliquot extractor from 0.02 to 0.5 molar increased the extraction percentage. The results are obtained from solvent extraction experiments showed there is a possibility to reach the recovery of 97% for vanadium extraction efficiency from alkaline leaching solution in the form of decavanadate V_10 O_28^(-6) or V_4 O_12^(-4) and anions 〖 VO〗_3^- and V_3 O_9^(3-) in one step if the optimal conditions of pH=6, the aqua-to-organic phase ratio of 1 and the organic phase concentration of 0.5 molar, were
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