China Nonferrous Metallurgy

This paper made an in-depth research on removal of impurity ions of Fe, Al and Mn in copper raffinate of copper oxide ore with hydrometallurgical process in Africa. The results showed that by using the process of removing impurities with CaO-P204 eight-stage counter-current extraction, the Mn removal efficiency can be above 91%. The removal efficiency for other impurities can be above 95%, while the retaining rate of Co can be above 95%. The optimum process conditions for CaO precipitation and impurity removal are follows: the CaO dosage is 1.0 g/30 mL(prepared into the slurry with a density of 70%), the precipitation temperature is room temperature and the precipitation time is 10 min. The optimum process conditions for P204 extraction and impurity removal are follows: extraction temperature is room temperature, extraction pH is 2.5-3.0, saponification rate of extractant is 40%, extractant concentration is 10%, phase ratio(O/A) is 1∶1 and extraction time is 10 min.