Determination of 15 primary and secondary components in tungsten ore by X-ray fluorescence spectrometry after powder sheeting
Accurately determining the main and trace components of scheelite can provide key data for the smelting and deep processing of scheelite,and also has guiding significance for studying its mineral composi-tion,tungsten deposit resource development,and comprehensive utilization.By optimizing conditions such as sample particle size,type and dosage of binder,an analysis method for simultaneously determining 15 main and trace components in scheelite using powder pressing and X-ray fluorescence spectrometry is estab-lished.Calibration samples were prepared by mixing spectrally pure oxides with scheelite reference material GBW 07241 at different mass ratios to solve the problems of matrix matching and concentration gradient in the calibration series,and further corrected for matrix effects and spectral line overlap effects using the theo-retical a coefficient method.The results show that when the sample particle size is less than 74 μm,with 2%boric acid as the binder by mass fraction,and maintained at 40 MPa for 15 s smooth surface samples with good repeatability can be prepared.Using scheelite reference material GBW 07369 as the research object,the analysis results further corrected by the theoretical a coefficient method have a relative standard deviation(RSD,n=12)of 0.58%to 7.79%,and the relative error ε between the measured values and the certified values is between 15.32%and 5.00%.This method was applied to determine the main and trace components in 4 actual scheelite samples(1 # and 2 # are black tungstenite,3 # and 4 # are white tungstenite),and the results are consistent with those obtained by chemical methods.
tungsten oreprimary and secondary componentsX-ray fluorescence spectrometrypowder sheeting