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在自然界中,金主要以元素状态散布在岩石层或砂矿中,银主要以硫化物的形式存在。由于金银在地壳中含量低,在用现代测试手段测定各种物料中金银的含量之前,预分离富集是不可缺少的。本文就近年来有关金银的分离富集方法予以介绍,以供参考。 一、火试金法 火试金法是把冶金学的原理和技术运用到分析化学中来,是预富集的一种特殊方式。样品的分解和金银等贵金属的富集被结合在一步操作中,使其与共存元素分离。根据所采用的捕集剂不同,火试金法可分为铅试金、铋试金,锡试金等,下面分别加以介绍。
In nature, gold is predominantly interspersed in rock or sand deposits as elements and silver predominately in the form of sulphides. Because of the low content of gold and silver in the earth’s crust, pre-separation and enrichment are indispensable until the content of gold and silver in various materials has been determined by modern testing methods. This article on the separation of gold and silver in recent years, enrichment methods are introduced for reference. First, the fire test method Fire test method is to apply the principles and techniques of metallurgy to analytical chemistry, pre-enrichment is a special way. The decomposition of the sample and the enrichment of precious metals such as gold and silver are combined in one step to separate it from the coexisting elements. According to the different collector used, the fire test method can be divided into lead gold test, bismuth test gold, tin test gold, the following were introduced.