Determination of copper in silver separating residue from copper smelting by iodometry
FAN Lixin1,2, LU Qing3,4
1. MTC Testing Technical Co.,Ltd., Beijing 102628, China; 2. Beijing Key Laboratory for Evaluation and Testing of Metallic Mineral Resources, Beijing 102628, China; 3. Central Iron and Steel Research Institute,Beijing 100081,China; 4. NCS Testing Technology Co.,Ltd., Beijing 100094, China
Abstract：The silver separating residue from copper smelting contains high content of arsenic, antimony, tin and other elements, which have interference with the determination of copper by iodometry. Moreover, the sample is difficult to be dissolved completely. The sample in experiments was decomposed with hydrochloric acid-nitric acid-perchloric acid-sulfuric acid. Then, the interference elements including arsenic, antimony and tin were removed by hydrobromic acid. The pH of sample solution was controlled at 3-4. Ammonium hydrogen fluoride was added to mask iron. Potassium iodide was added to react with copper (Ⅱ), and the iodine precipitated was titrated with sodium thiosulfate standard titration solution using starch as the indicator. Consequently, the determination method of copper in silver separating residue from copper smelting by sodium thiosulfate iodometry was established. The experimental conditions such as sample dissolution method, addition amounts of glacial acetic acid and saturated ammonium hydrogen fluoride were optimized. The experimental method was applied for the determination of copper content in silver separating residue from copper smelting. The relative standard deviations (RSD, n=11) of determination results were 0.30% and 0.85%, and the recoveries were between 99.6% and 101.8%.
范丽新, 陆青. 碘量法测定铜冶炼分银渣中铜[J]. 冶金分析, 2021, 41(2): 60-65.
FAN Lixin, LU Qing. Determination of copper in silver separating residue from copper smelting by iodometry. , 2021, 41(2): 60-65.
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