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湿法测定矿石中金,所用的沉淀富集法一般是硒或碲共沉淀法。作者曾用氯水溶样、锌粉置换富集金,效果较好。用活泼金属置换富集试液中金,比较快速,但需在中性或较弱的酸性条件下进行置换,置换出来的重金属杂质较多,需酸洗排除杂质。本法用盐酸、溴(或氯)水溶解矿石中金,然后用锑粉置换富集金,同时被锦置换出来的杂质极少,不干扰金的原子吸收法测定。锑置换富集会可在0.5%～20%盐酸介质中进行,置换出的金沉淀粗,可用中速滤纸过滤,分离出来的金与残留的锑粉用王水溶解,用酒石酸络合锑,制备成待测液。在10%王水溶液中,酒石酸浓度小于3%,锑含量小于20mg ml~(-1),不干扰金的测定,方法简便,易于掌握,回收率可达96%以上。方法的准确度和精密度亦比较高,适用含金0.5克·吨~(-1)以上矿石中金的测定。
Wet determination of gold ore, precipitation enrichment method used is generally selenium or tellurium coprecipitation. The authors have used chlorine water soluble samples, zinc enrichment gold replacement, the better. Replacing the enrichment test solution with live metal is faster, but it needs to be replaced under neutral or weak acid conditions. The heavy metal impurities that are replaced are more, and pickling is required to remove impurities. This method uses hydrochloric acid, bromine (or chlorine) water to dissolve the gold in the ore, and then replace the enriched gold with the antimony powder. At the same time, the impurities removed by the Kam Permex are very few and do not interfere with the gold atomic absorption spectrometry. Antimony enrichment can be carried out in 0.5% ~ 20% hydrochloric acid medium, the exchange of gold precipitated crude, available medium-speed filter paper, the separation of gold and residual antimony powder dissolved in aqua regia, tartaric acid complex antimony, Prepared as test solution. In 10% aqua regia solution, the tartaric acid concentration is less than 3% and the antimony content is less than 20mg ml -1, which does not interfere with the determination of gold. The method is simple and easy to master, and the recovery rate can reach more than 96%. The accuracy and precision of the method are also relatively high, and the determination of gold in ore above 0.5 g · t ~ (-1) is suitable.