Abstract：Accurate determination of the total amount of rare earth in iron ore is of great significance to effectively control the production technology and product quality of iron ore. Because the product category, content and composition of iron ore are different from those of the past, it is necessary to improve the inherent experimental methods. In this experiment, sodium hydroxide and sodium peroxide were used to melt samples, which were leached with triethanolamine solution. In the presence of hydroxylamine hydrochloride and ascorbic acid, interference elements such as iron, manganese, aluminum and calcium were separated by EDTA complexation. Rare earth and thorium were precipitated with oxalic acid in weakly acidic medium with pH 1.8～2.0, and the oxalic acid precipitate was burned into oxide at 900℃, and its mass was weighed. The amount of rare earth oxide is obtained by subtracting the amount of thorium dioxide from the mass of oxide. According to the experimental method, the total amount of rare earth in iron ore samples was determined, and the relative standard deviation (RSD,n=11) of the results were all less than 2.0%, and the recovery rate was 99%-101%. Oxalate gravimetric method was used to determine the total amount of rare earth in iron ore. On the premise of referring to a series of similar analysis methods, the influence of various conditions on the determination of total amount of rare earth was fully tested, and this method was determined. This method has the advantages of good accuracy, wide applicable product detection range and small influence of interference elements.
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2022, Vol. 29 