Abstract：The red mud sample was dissolved with nitric acid, hydrofluoric acid and sulfuric acid followed by passing strongly acid exchange resin (Dowex50W-X8, H+ type) column. After elution with 2 mol/L hydrochloric acid for several times, the scandium in ion exchange resin was eluted and enriched with 5 mol/L hydrochloric acid. The solution was evaporated to dryness by heating. Then, the perchloric acid was added and the solution was heated to dryness. The residue was dissolved with 10 mol/L of hydrogen peroxide and 6 mol/L of hydrochloric acid followed by drying, respectively. The residue was dissolved with 2 mol/L hydrochloric acid and the solution was transferred into separating funnel. The sulfosalicylic acid and bromocresol green was added successively. Then, the solution was adjusted with ammonia water and hydrochloric acid to yellow. The chlorophosphonazo-PN (CPA-PN) was added for coloring and reacting with scandium to form α complex, which was then extracted with 20 mL of 0.02 mol/L 1-phenyl-3-methyl-4- benzoyl-5-pyrazolone (PMBP-benzene). The absorbance was measured on spectrophotometer at 680 nm. The content of scandium could be obtained from the calibration curve. Therefore, the determination method of scandium in red mud by spectrophotometry after separation with ion exchange resin was established. The results showed that the mass concentration of scandium in solution in range of 0.01-0.48 μg/mL was linear to the absorbance. The linear correlation coefficient of calibration curve was r=0.998 9. The apparent molar absorptivity was 3.86×104 L·mol-1·cm-1. The detection limit of scandium in this method was 0.42 μg/g. The interference tests indicated that for 5.0 μg of Sc (III) in solution, the tolerant amount of co-existing ions was defined as resulting in error of no more than ±5 %, and was listed as following (in fold): BO33- (600), NH4 (I) (200), Ca (II) (100), RE2O3 (60), Be (II) (30), Fe (III)(25), Al (III)(25), Mn (II) (25), Zr (IV) (4), Ti (IV)(2), Ta (V) (2). The content of scandium in actual red mud sample was determined according to the experimental method. The relative standard deviations (RSD, n=6) were between 2.5% and 3.9%. The found results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry.
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