Determination of Major and Minor Components in Coal Ash by X-Ray Fluorescence Spectrometry Combined with Melting Method for Sample Preparation

4.000 0 g of anhydrous lithium tetraborate, 0.250 0 g of the sample, and 0.250 0 g of Co internal standard were added into a platinum crucible successively. The mixture was stirred well, and then covered with 3.000 0 g of anhydrous lithium tetraborate on the surface. After 0.25 mL of 1 000 g·L^-1 lithium bromide solution was added, the mixture was pre-oxidized at 650℃ for 10 min in an electric heating auto-melting sampler, and then placed at 1 080℃ for 2 min, melted for 17 min, and set for 3 min to obtain a fuse, for determination of major and minor components in the coal ash sample under selected working conditions. Twelve tandard coal ash samples determined by national stanard method and two iron ore standard samples were used as the calibration samples to draw the calibration curves. The matrix correction and spectral line overlap interference correction were performed by using the empirical coefficient method and theoretical α coefficient method. The components of the coal ash samples were determined by the proposed method, giving results were consistent with that obtained by the standard method, and RSDs (n=11) in the range of 0nent; coal ash