Abstract:The analytical method that direct determination of the range from 0.0005%～0.300% scandium, gallium, cobalt and 0.0005%～0.600% chromium, nickel in the blast furnace slag of vanadium titanium magnetite by inductively coupled plasma atomic emission spectrometry was established. The blast furnace slag is digested with hydrofluoric acid, hydrochloric acid, nitric acid and sulfuric acid, it is heated at high temperature until sulfuric acid is decomposed to produce sulfur trioxide white smoke, and then the sample solution is prepared by directly diluting to volume with water. The method rapidly and completely dissipated the high titanium sample, and the high content of the silica matrix and the residual hydrofluoric acid were removed by volatilization, thus reducing the solution coexisting components and effectively reducing the matrix effect and avoiding corrosion detection instruments. At the same time, the high titanium matrix is complexed with sulfate to form titanium oxysulphate ion, which solves the problem of high-concentration titanium matrix easily hydrolyzed in low acidity media. Therefore, there is no need to add a large dose of acid to limit the hydrolysis of titanium, and the sample solution can be diluted directly with water to reduce the acidity of the solution and reduce the effect of acidity. That the influence of the spectral interferences and matrix effects in the high concentrations of titanium, iron, vanadium, aluminum, calcium and magnesium coexistence matrix system had been studied, and then the detection conditions of the elements such as analytical lines, background correction areas, and spectrometer operating parameters are optimized. The influence of substrate composition were eliminated by the matrix matching and synchronous background correction measures. The technical performance reached: the calibration curve correlation coefficient is >0.999, the background equivalent concentration is 0.0001% to 0.0002%, the element detection limit is 0.0001% to 0.0002%, and the RSD is <15% within the detection range, the recoveries were 90% ~ 114%.