Determination of Fe, Ti and V in Vanadium Titanomagnetite Ore by Inductively Coupled Plasma-Atomic Emission Spectrometry

A method for the determination of Fe, Ti and V in vanadium titanomagnetite ore sample by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) is presented. The sample was digested by 3 different systems: 4 acid digestion of HCl-HF-HNO₃-HClO₄, 3 acids digestion of H₂SO₄-HF-HNO₃ and KOH alkali fusion. The results verify all 3 digestion methods as being applicable for vanadium titanomagnetite ore samples by ICP-AES. KOH alkali fusion made a good comparison among the different methods, 3 acids digestion was suitable for internal testing and 4 acids digestion was suitable for a large amount of samples. The optimal analytical lines were selected for the determination of V, Ti and Fe. Work calibration curves were established by using the standard material of vanadium titanomagnetite ore for the metallurgy industry, which avoids the matrix effect during the measurement. The main ions in the sample solution have little interference for the selected analytical lines. The detection limits of V, Ti and Fe by ICP-AES with 4 acids digestion were 0.0032%, 0.0024% and 0.0003%, respectively. The RSDs were between 0.43%-5.06%. Applicability and feasibly of the method were verified by comparison of results obtained by different laboratories without significant system deviation. This method has the advantages of complete digestion, fast, accurate determination, and a wide range of measured contents. It is suitable for determining Fe, Ti and V in vanadium titanomagnetite ore.