Abstract：During the determination of gold and silver in copper concentrate by lead fire assaying gravimetric method, partial copper would be retained in lead button together with gold and silver in high temperature melting process due to the high content of copper. As a result, copper could be converted to copper oxide slag in cupellation, leading to congelation phenomenon of lead button which influenced the determination. The influence of copper in sample on determination was eliminated by optimizing the experimental conditions, then the determination of gold and silver in copper concentrate by lead fire assaying gravimetric method was realized. The effect of copper content in lead button on cupellation in lead fire assaying was discussed. The results showed that copper had no influence on the determination of gold and silver when the content of copper in lead button was less than 1g. The determination conditions of gold and silver in copper concentrate by lead fire assaying gravimetric method were optimized. The results showed that the content of copper in lead button could be effectively controlled below 1g under the following conditions: the sampling amount was 15g, the lead oxide content was 135g and the silicate degree was 0.5, thus the influence of copper in sample on determination could be eliminated. The effect of cupellation temperature on the determination results of gold and silver was explored. The cupellation temperature at 860℃ was finally selected. The proposed method was applied for the analysis of actual sample of copper concentrate, and the results were consistent with those obtained by national standard method GB/T 3884.1—2012. Two copper concentrate samples were determined according to the experimental method. The relative standard deviation (RSD, n=7) for gold and silver was less than 5% and 2%, respectively.
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