火试金重量法测定碲化铜中的金和银

Determination of gold and silver in copper telluride by fire assay gravimetric method

现行碲化铜中金和银测定标准方法YS/T 1329.3—2019可以准确测定碲化铜中金和银含量,但操作繁琐、周期长,难以满足铜冶炼企业快速测定碲化铜中金和银的要求。本文试验摈弃酸预处理除铜、碲等杂质工序,建立直接火试金重量法准确、快速测定碲化铜样品中的金、银含量,并通过一系列试验探索获得最佳检测条件。该方法的主要特点在于采用火试金重量法直接分析检测,不但准确性好、效率高,对于低金含量(Au<10 g/t)样品也同样适用。按照试验方法测定5个碲化铜样品,结果的相对标准偏差(RSD为0.34%~2.76%,n=7)为0.34%~2.76%,金的加标回收率为98.7%~101.2%,银的回收率为97.5%~99.0%;按照试验方法测定碲化铜中金和银,与YS/T 1329.3—2019方法测定结果进行比对,结果相一致。试验方法适用于铜冶炼过程中碲化铜样品金、银含量的测定,可用于日常检测分析。

The current standard method YS/T 1329.3—2019 can accurately determine the content of gold and silver in copper telluride,but it is difficult to meet the requirements of copper smelting enterprises for rapid determination of gold and silver in copper telluride due to its complicated operation and long cycle.In this experiment,acid pretreatment to remove impurities such as copper and tellurium was abandoned,and the optimal detection conditions were explored through a series of experiments.The direct fire assay gravimetric method was established to accurately and quickly determine the content of gold and silver in copper telluride samples.The main characteristic of the method lies in the direct analysis and detection of gold by fire assay gravimetric method,which is not only accurate and efficient,but also suitable for low content(Au<10 g/t) samples.The relative standard deviations(RSDs) of the results of five copper telluride samples determined based on the test method were 0.34%-2.76%,n=7.The addition standard recoveries of gold and silver were 98.7%-101.2% and 97.5%-99.0%,respectively.Gold and silver in copper telluride were determined according to the test method and compared with the results determined by YS/T 1329.3—2019 method,the results were consistent.The test method is suitable for the determination of gold and silver in copper telluride samples during copper smelting,and can be used for daily detection and analysis.