Abstract:Because of the complex composition of tungsten tailings and low tin content in the tailings, the traditional titration analysis method and colorimetric analysis method are easily interfered by tungsten, copper and other elements, resulting in unsatisfactory results of tin determination in tungsten tailings. In this paper, sodium peroxide is used to melt tungsten tailings samples, water leaching, hydroxide precipitation separation of most of the interference elements, supernatant liquid acidification, atomic fluorescence spectrometry is used for determination, which solves the problem of insufficient sensitivity, and eliminates the influence of coexisting tungsten, copper and other elements on the determination of tin, and establishes the accurate determination of tin in tungsten tailings by atomic fluorescence spectrometry. At the same time, the influence of sample treatment method, determination of solution acidity, thiourea-ascorbic acid mixed reducing agent and potassium borohydride concentration on the determination of tin by atomic fluorescence spectrometry is investigated, and the determination parameters of atomic fluorescence spectrometry are optimized. The relative standard deviation (RSD, n=7) of the determination of tin is less than 5%. The tungsten ore composition analysis standard substance with tungsten content similar to that in tungsten tailings is used for method verification, the absolute value of the relative error is less than 5%, and the sample spiked recovery test is done, and the recovery rate is 94%~108%. The experimental results show that the method for determining tin in tungsten tailings has the advantages of simple operation, high sensitivity, less interference, high accuracy and low cost.