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氰化法是从矿石中提取黄金的主要方法。当有氧参加时,单质金溶解于氰化钾溶液中,即有氰亚金酸钾形成:4Au+8KCN+2H_2O+O_2=4KAu(CN)_2+4KOH游离氰浓度是金矿氰化作业中的主要控制指标。为了降低氰化钾(或钠)的消耗,一些矿山将锌置换后的贫液返回一部分,重新用于氰化作业,致使氰化液中带入较多的锌,锌氰络离子的存在给游离氰的测定带来困难。据五龙金矿分析规程,黄金矿山实际使用的游离氰其测定方法是用 AgNO_3在碱性条件下,滴定游离氰与锌氰合量,另用络合滴定法测定锌含量,然后按摩尔比,锌:氰=1
Cyanide method is the main method of extracting gold from ore. When aerobic participation, the elemental gold dissolved in potassium cyanide solution, potassium cyanuronate that is formed: 4Au +8 KCN + 2H_2O + O_2 = 4KAu (CN) _2 + 4KOH free cyanide concentration of gold cyanide operations The main control indicators. In order to reduce the consumption of potassium cyanide (or sodium), some mines return part of the lean liquid after the replacement of zinc and re-use it for cyanidation, leading to the presence of more zinc and zinc cyanide ions in the cyanide liquid Determination of free cyanide difficult. According to Wulong gold ore analysis procedures, the actual measurement method of free cyanide used in gold mines is to titrate the amount of free cyanide and zinc cyanide with AgNO_3 under alkaline conditions, and determine the zinc content by complexometric titration, and then measure the molar ratio , Zinc: Cyanide = 1