Study on the Method of Impurity Removal for Containing Impurities Gold Particles in the Analysis of Miscellaneous Copper Gold Content
The determination of gold content of miscellaneous copper is usually referred to YS/T 521.2-2019"Chemical analysis methods of crude copper Part 2:Determination of gold and silver content-Dry and wet fire assay and direct fire assay",which is analyzed by gravimetric method and atomic absorption spectrometry.Unformed or non-gold particles appearing in the process of gold content analysis of miscellaneous copper are commonly known as containing impurities gold particles.The reference standard method for the analysis of containing impurities gold particles should be atomic absorption spectrometry,but it has the problem of poor repeatability of gold results in the actual analysis process.The experiments of impurity removal in different materials of ash dish and ash blowing,as well as the experiments of impurity removal in secondary ash blowing containing impurities gold particles plus metal silver coated lead foil were carried out in the paper.The results show that the effect of ash dish and ash blowing with different materials on the impurity removal of containing impurities gold particles is not obvious,and the effect of secondary ash blowing with containing impurities gold particles plus metal silver coated lead foil is good.The method of secondary ash blowing with containing impurities gold particles plus metal silver coated lead foil is simple operation,good repeatability and high accuracy,and provides a reference for the impurity removal of containing impurities gold particles in the analysis of miscellaneous copper gold content.
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