乙酸除铋火试金法测定粗铋中的金银含量

建立了用乙酸分离粗铋中铋-火试金重量法测定粗铋中金和银含量的方法。首先把粗铋焙烧氧化,然后用乙酸溶解粗铋的氧化物,过滤除去铋,消除铋对火试金法的干扰,将沉淀物灰化后,配料、高温熔融,熔态的金属铅捕集试样中的贵金属形成铅扣,将铅扣灰吹,得到金银合粒,用硝酸溶解分离金,用重量法测定金含量。方法准确度高,精密度好,金的加标回收率为99.2%～101%,银的加标回收率为98.2%～99.7%。能很好地满足粗铋中金、银的测定。

The content of gold and silver in coarse bismuth was determined by fire assay with bismuth removal by acetic acid

A gravimetric method for the determination of gold and silver in crude bismuth by bismuth - fire assay was established. The crude bismuth roasting oxidation first, and then dissolved in acetic acid crude bismuth oxide, filter to remove bismuth, to eliminate the influence of bismuth against fire assay method, after sediment ashing, ingredients, high temperature melting, molten metal lead capture precious metals in a sample form clasp, button will lead ash blowing, get the gold and silver grain, nitric acid dissolved in separating gold, gold content was determined by gravimetric method. The method has high accuracy and precision, and the recovery of gold is 99.21-100.50% and silver 98.18-99.72%. It can satisfy the determination of gold and silver in coarse bismuth well.