Abstract: To address the difficulties in fusing chromium and the simultaneous accurate determination of sodium,phosphorus and other elements in high-chromium iron ore,a calibration series was established by combining various certified reference materials(CRM/RM) including high-chromium nickel iron ore,iron ore,chromite,lateritic nickel ore and nickel ore through mixed preparation.On this basis,the simultaneous determination of 11 components(sodium oxide,magnesium oxide,aluminum oxide,silicon dioxide,phosphorus pentoxide,potassium oxide,calcium oxide,titanium dioxide,chromium sesquioxide,manganese oxide and nickel oxide) in high-chromium iron ore by X-ray fluorescence spectrometry(XRF) with fusion sample preparation was realized.A mixed flux of lithium tetraborate-lithium metaborate(m∶m=12∶22) was adopted with a sample-to-flux dilution ratio of 1∶15.Ammonium iodide and lithium bromide solution was used as releasing agent.Uniform and transparent glass fused beads were obtained after fusion at 1 100 ℃ for 15 min.The built-in SPECTRA^PLUS software was applied for matrix correction using theoretical α coefficient,which effectively eliminated the influence of matrix effect.The contents of 11 components in high-chromium iron ore were determined according to the experimental method,and the relative standard deviations(RSD,n=12) of determination results ranged from 0.10% to 4.8%.The t-test indicated that there was no significant difference between the results obtained by this method and those by traditional chemical methods.The measured values of three CRMs of high-chromium nickel iron ore and two synthetic samples prepared from CRM/RM were consistent with the certified or reference values.The proposed method was suitable for the comprehensive composition analysis of high-chromium iron ore.