Determination of chromium cobalt nickel gallium niobium scandium and zirconium in the blast furnace slag of vanadium titanium magnetite by inductively coupled plasma atomic emission spectrometry

In order to recover the precious metal elements in vanadium-titanium blast furnace slag, the analytical method that direct determination of the range from 0.001% ~ 0.300% chromium, cobalt nickel, gallium, niobium, scandium and zirconium in the blast furnace slag of vanadium titanium magnetite by inductively coupled plasma atomic emission spectrometry was established. Sample digestion reagent consists of hydrofluoric acid, hydrochloric acid, nitric acid and sulfuric acid, and their ratio, dosage and reaction control condition are all optimized, so make sure that the blast furnace slag of vanadium titanium magnetite can be quickly completely digested. At the same time, the high content of silicon dioxide can be removed by volatilization to simplify the sample solution matrix composition, and because of the titanium ion and sulfate ion complex reaction generating oxygen titanium sulfate ion so as to solve the high concentration of titanium matrix easy hydrolysis problem in low acidity medium, thus it greatly reduce the acidity of sample solution to reduce the matrix effect. 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, then the test results are classified summary. The influence of substrate composition were eliminated by the matrix matching and synchronous background correction measures, and then the analytical lines, the background correction areas and working conditions of the spectrometer are all optimized according to the spectral interference test. The technical performance reached: calibration curve correlation coefficient of 0.998 or higher, detection limit of element is 0.0001% ~ 0.0003% and the measuring elements content in lower 0.0003% ~ 0.0009%, RSD is less than 15% when the element content in the range from 0.001% to 0.05%, the actual sample testing results are consistent with ICP-MS.