火焰原子吸收光谱法快速测定低镍锍中微量银

Rapid Determination of Trace Sliver in Low-Nickel Matte by Flame Atomic Absorption Spectrometry

摘要:

低镍锍是传统火法冶炼镍的中间产物，硫化镍矿中的有价金属元素（如 Ni、Cu、Fe、Co等）富集形成硫化物共熔体，贵金属元素（如Au、Ag、Pt等）也富集进入低镍锍中。测定低镍锍的贵金属含量有助于评估低镍锍的价值。建立一种快速测定低镍锍中微量银的方法，使用硝酸、盐酸及高氯酸混合酸溶解低镍锍试样，在盐酸介质中使用火焰原子吸收光谱仪测定银的含量。同时，考查了Fe、Ni、Cu、Co等主要成分对银含量测定的干扰。研究结果表明：低镍锍的基体元素，对银含量的测定结果无干扰；对样品进行测试，得到该方法的相对标准偏差（RSD）为0.41%—1.41%，加标回收率介于96.2%—107.0%。说明，火焰原子吸收光谱法简单快速，测量结果稳定、准确度高，可满足低镍锍中微量银的测定需求。

Abstract:

Low-nickel matte is the intermediate product of traditional fire smelting nickel. The valuable metal elements of Ni， Cu， Fe and Co in nickel sulfide ore are enriched to form the eutectic mixture， while the noble metal elements are also enriched in the low-nickel matte. Accurate determination of noble metal contents in low-nickel matte is helpful to evaluate the value of low-nickel matte. In this paper， a rapid method for determination of trace silver in low-nickel matte is established. Low-nickel matte samples were dissolved by a mixture of nitric acid， hydrochloric acid and perchloric acid， and then stored in dilute hydrochloric acid. The silver content was determined by flame atomic absorption spectrometry. The influence of main components such as Fe， Ni， Cu and Co on the determination of silver content was investigated. The results showed that the matrix elements in low nickel matte had no influence on the determination of silver content. Five samples were tested for 7 times， and the relative standard deviation （RSD） of this method was 0.41%—1.41%. The sliver recoveries were 96.2%—107.0%. This method is simple， rapid， stable and accurate， which could meet the requirements for the determination of trace amounts of silver in low-nickel matte.