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我们尝试用光谱的方法协助解决分析大量铁矿精矿试样中微量铜(O.05-0.1％)的问题。采用了交流电弧碳电极粉末法,应用现有的设备(中型光谱仪、不纯碳电极、质量低的照相板)进行试验,找出了比较适当的激发条件和分析线对。把空白碳电极加以预燃并在铁矿试样中搀入适当分量的碳粉,可以基本上消减样品在燃烧中的喷爆现象。根据样品的燃烧曲线的研究,选择了适当的曝光时间,使分析的结果不受样品所含铜的化学组成状态的影响。 所选定的分析线对当含铜量在0.05-0.3％的范围内时是Cu2824.369-Fe2824.67,当含铜量在0.3-1.0％的范围内时是Cu2824.369-Fe2828.813。根据所得的两条定标曲线作了110个样品的分析,光谱分析结果与化学分析结果的差值在0.02％以下的约占分析样品总数的80％左右。关于含铜量为0.05-0.3％的样品,光谱分析已经可以代替化学分析,并节省大量的人力和物资。
We tried to solve the problem of analyzing trace copper (O.05-0.1%) in a large number of iron ore concentrate samples by means of spectroscopy. Using AC arc carbon electrode powder method, the use of existing equipment (medium-sized spectrometer, impure carbon electrodes, low-quality camera board) were tested to find the more appropriate excitation conditions and analysis of the line. Pre-burning the blank carbon electrode and adding the appropriate amount of carbon powder into the iron ore sample can substantially reduce the explosion phenomenon of the sample in the combustion. According to the study of the combustion curve of the sample, the appropriate exposure time was chosen so that the results of the analysis were unaffected by the chemical composition of the copper contained in the sample. The selected analytical line pair is Cu2824.369-Fe2824.67 when the copper content is in the range of 0.05-0.3% and is Cu2824.369-Fe2828.813 when the copper content is in the range of 0.3-1.0% . Based on the obtained two calibration curves, 110 samples were analyzed. The difference between the spectral analysis results and the chemical analysis results was below about 80% of the total samples analyzed under 0.02%. For samples with 0.05-0.3% copper, spectral analysis can replace chemical analysis and save a lot of manpower and material.