Simultaneous Determination of 16 Elements in Copper Concentrate by Pre-oxidation-fusion Sample Preparation-X-ray Fluorescence Spectrometry
The pre-oxidation effect of copper concentrate was investigated using an X-ray diffractometer.The results showed that copper,iron and sulfur in copper concentrate were primarily present as chalcopyrite(CuFeS2).After oxidation at 650℃ for 30 min with sodium nitrate as oxidant,the above elements were transformed into CuO,Fe2O3 and sulfate,so as to avoid crucible corrosion and element loss.The effects of key melting conditions,such as the flux-to-sample ratio and the release agent on the quality of the fused sheet were investigated.Lithium bromide was used as a release agent,and a mixture of lithium tetraborate and lithium metaborate(Li2B4O7-LiBO2)was used for melting in a mass ratio of 12:22.Uniform and complete glass sheets were obtained after melting at 1050℃ for 12 min.A calibration curve,designed to meet daily analytical requirements,was established using certified reference materials from copper ore and copper concentrate as calibration standards,supplemented with a mixture of these standards and some actual samples.The effects of test conditions such as instrument voltage,current,and spectral overlap were systematically studied,and the wavelength dispersive X-ray fluorescence spectrometry method for the detection of 16 elements such as Cu,Fe,S,CaO,MgO,SiO2,Al2O3,K2O,Zn,As,Pb,Bi,Ni,Mn,Co,and Mo in copper concentrate was established.The detection limits of the method ranged from 0.0010%to 0.15%,with quantitative limits between 0.0033%and 0.50%,and the relative standard deviation(RSD)was 0.14%-10.12%.The results obtained using this method were consistent with the certified reference materials.
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