Elimination of Cadmium from Wet Process Phosphoric Acid with Alamine 336

摘要

Cadmium (Cd) is one of the toxic heavy metal in nature that could be found in phosphate rocks and "Wet Process Phosphoric Acid" (WPA). In the experimental study, Cd was removed from WPA by solvent extraction method, using amine extractants, preferably "Alamine 366" as a tertiary amine extractant. In batch wise tests, extraction percent of Cd from WPA under optimal conditions was identified 74+ -2.54 percent (confidence limit: 95 percent). It is concluded that organic phase containing 1 percent (vol) Alamine 336 + 1.5 percent (vol) Isododecanol in B-65 kerosene has good stability and high efficiency in removal of Cd from WPA. Average Cd extraction in the batch wise tests, after 20 recycling stages of organic phase to solvent extraction circuit was identified 68.57 percent.