Determination of scandium oxide in acid leaching solution from red mud by diethylenetriaminepentaacetic acid titration
LI Wang1,2,ZHU Xiao-bo*1,2,TANG Sen1
1.College of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454000,China; 2.Collaborative Innovation Center of Coal Mine Safety of Henan Province,Jiaozuo 454000,China
Abstract：A method for the determination of scandium oxide of acid leaching solution from red mud with diethylenetriaminepentaacetic acid titration (DTPA) was put forward. To prepare sample solution, 10 mL of test solution was put into a beaker, which was then adjusted to pH 3.0-3.5 by ammonia and stirred for 20 min. After the removal of the sediments through solid-liquid separation, the filtrate was added into a 500 mL conical flask, and then the pH value was adjusted to 1.6-6.0 with hydrochloric acid or ammonia. The test solution was at last titrated by DTPA solution with five drops of xylenol orange as indicator. The titration end point was identified through wine red becoming bright yellow. The effect of pH value scandium oxide mass concentration, titration temperature, and storage time on the test results was investigated. The results showed that the proposed method could be applied to a wide scope of scandium oxide content at 20-500 mg/L. The suitable pH range was 1.6 to 6.0. The titration temperature of 20-60 ℃ and storage time of 20 min had no effect on the results. The results of coexisting elements interference showed that the interference of iron and aluminum in the sample could be eliminated by mixing the sample with ammonia before agitation and precipitation, while the other coexisting elements could not interfere with the determination. The measured results were consistent with those of inductively coupled plasma atomic emission spectrometry(ICP-AES), where the relative standard deviation RSD (n=5) was less than 0.2%.
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LI Wang,ZHU Xiao-bo,TANG Sen. Determination of scandium oxide in acid leaching solution from red mud by diethylenetriaminepentaacetic acid titration. , 2017, 37(8): 54-58.
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