基于Voigt函数拟合的能量色散X射线荧光光谱(EDXRF)法测定金矿粉末中低品位金

Determination of Low-grade Gold in Gold Ore Powders by Energy Dispersive X-ray Fluorescence Spectroscopy Based on Voigt Function Fitting

为了提高金矿粉末含金量检测的准确性和安全性,以金矿粉末为研究对象,运用能量色散X射线荧光光谱法(EDXRF)对金矿粉末进行检测,利用Voigt函数拟合分离出金元素的Lα纯元素特征峰,分析测定金矿粉末中金的含量。在实验中,发现金的Lα峰与锌的Kβ峰存在明显重叠,为了排除锌元素的干扰,引入降噪技术和Voigt函数进行分峰处理,利用纯锌和纯金的标准溶液配制符合金矿粉末样品中锌金四种比例的混合溶液,通过滤波和降噪算法处理得到相对纯净的重叠峰,加入Voigt函数拟合分离锌和金的重叠峰,得到金的Lα峰净强度值,通过纯金和纯锌标准溶液建立回归线得到金矿粉末中金的真实含量,对比金矿粉末的参考含量数据,偏差度皆小于10%,含量大于3 g/t以上偏差值则小于2%,结合EDXRF法对检测样品无损伤的特点,提高了金矿中金含量检测的安全性、准确性和可靠性。

To improve the accuracy and safety of gold content detection in gold-ore powder,this study focused on gold powder and uses energy dispersive X-ray fluorescence spectroscopy(EDXRF)to detect the gold-ore powders.The Voigt function was used to fit and separate the Lα-peak of gold element.The characteristic peak of pure elements was used to analyze and determine the content of gold in gold-ore powders.In the experiment,there was obvious overlap in the peaks between Lα-peak and Kβ-peak of zinc.In order to eliminate the interference of zinc elements,we introduced noise reduction technology and Voigt function for peak separation.We used a standard solution of pure zinc and pure gold to prepare a mixed solution that met the four ratios of zinc and gold in gold powder samples.Through filtering and noise reduction algorithms,relatively pure overlapping peaks were obtained.We added Voigt function to fit and separate the overlapping peaks of zinc and gold,and obtained the Lαof aurum.The peak net intensity value was obtained by establishing a regression line using pure gold and pure zinc standard solutions to obtain the true content of gold in gold-ore powders.Compared with the reference content data of samples,the deviation degree was less than 10%,and the deviation value was less than 2%if the content was greater than 3 g/t.Combined with the non-destructive characteristics of the EDXRF method for detecting samples,the safety,accuracy,and reliability of gold content detection in gold-ore powders were improved.