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湿法测定矿石中金,一般以王水溶解试样,也有资料介绍用饱和氯水和溴水溶解矿石中的金,此法溶出的杂质比较少,但溶出液中往往含有铜、锌等元素干扰测定,同时氯、溴在水中的溶解度较低,需用较大体积的氯水、溴水才能保证矿石中的金完全浸取,因此需要分离富集浸出液中的金。经试验,因锌粉很容易将浸出液中的金置换出来,置换出的沉淀物经硝酸处理,可将大部分干扰元素除去,最后用王水溶解金,以原子吸收法或氢醌容量法测定(本文只介绍原子吸收法),方法快速、简便、成本低,回收率达96％以上,可满足生产上的要求。 一、试剂与仪器 饱和氯水:在锥形瓶中加入5g氯酸钾、
Wet determination of gold in the ore, the dissolution of the sample is generally aqua regia, but also information on the use of saturated chlorine water and bromine water to dissolve the gold in the ore, the method of dissolution of impurities less, but often contain leaching solution of copper, zinc and other elements Interference determination, at the same time chlorine, bromine solubility in water is low, the need for a larger volume of chlorine water, bromine water to ensure the complete gold extraction of ore, so the need for separation and enrichment of gold leaching solution. After the test, due to the zinc powder is easy to the gold in the leachate out of the replacement of the precipitate by nitric acid treatment, most of the interference elements can be removed, and finally dissolved in aqua regia, atomic absorption or hydroquinone volumetric method for the determination (This article describes only the atomic absorption method), the method is fast, simple, low cost, the recovery rate of 96% or more, to meet the production requirements. First, reagents and equipment saturated chlorine: Add 5g potassium chlorate in a conical flask,