焙烧除硒-火试金法测定银硒渣中金、银含量

Determination of Gold and Silver in Silver Selenium Residue by Roasting and Removing Selenium with Fire Assaying Method

建立了银硒渣中金、银含量的测定方法。通过高温焙烧除去银硒渣中的硒,然后用火试金法测定金、银含量。硒在750℃下焙烧30min能够完全除去,不会对火试金中金、银造成损失,在焙烧时铺垫二氧化硅避免样品黏附在试金坩埚壁上,并且配料时易于搅拌均匀。通过加标回收实验,测得金回收率为98.9%~101%,银的回收率为96.3%~98.6%。金相对标准偏差(RSD)小于2.5%,银相对标准偏差(RSD)小于1.1%。方法不仅简单、快速,而且准确度高、精密度好。

A novel method to determinate the gold and silver in silver selenium residue was established.The method removes selenium in silver selenium residues by high temperature roasting,and determinate gold and silver content by fire assay method.Selenium can completely be removed at 750 ℃ and roasting 30 min,and the gold and silver will not lose by fire assay method.Silica is paved to prevent the sample from adhering to the wall of the crucible during roasting,and easy mix the ingredients.This method is not only simple,fast,and high accuracy and good precision.By adding standard recovery test,the recovery rate of goldwas 98.9%-101%,the recovery rate of silver was 96.3%-98.6%.The RSD of gold was less than 2.5%,the RSD of silverwas less than 1.1%.The method is not only simple,fast and rapid,but also has high accuracy and good precision.