Abstract:

Fe3+ was extracted from Fe(NO3)3 by liquid phase extraction using a mixture of bi-(2-ethylhexyl) phosphate (P204) and tetrachloride carbon. Fe(OH)3 powders were prepared through stripping precipitation method with ammoniaalcohol aqueous solution as a re-extractant and precipitator. α-Fe2O3 powders were obtained by decomposing Fe(OH)3 at an appropriate temperature and characterized by TEM, FTIR, and XRD. The results show that the P204 contents are in the oil phase, Fe3+ contents are in the water phase, and the reaction time has obvious influence on the extraction of Fe3+. Under the optimum conditions of phase volume ratio at 1∶1, c(Fe3+) at 0.10 mol/L(pH=3.0), volume ratio of P204 and CCl4 as 1∶3, and reaction time of 20 min, 98.44% of Fe3+ is extracted. α-Fe2O3 powders with a small size and uniformity are obtained at 600 ℃. The optimum aging temperature and concentration of ammonia aqueous are 10.0 ℃ and 1∶7, respectively.

Key words: Iron Removal, precipitation by stripping precipitation, nano α-Fe2O3