用于光谱分析的高纯铱基体的研制

为满足新国家标准对铱标准样品的要求,研制出用于光谱分析的高纯铱基体.通过实验研究,确定了高纯铱基体研制的工艺流程为P₂₀₄萃取除去贱金属阳离子→N₂₃₅萃取除去以络合阴离子存在的贵金属杂质→H₂还原除铑及其他金属杂质→732^#树脂交换除去痕量的贱金属阳离子→NH₄Cl沉淀铱、H₂还原铱→HF除硅.研制出的铱基体纯度高达99.999%.实验研究全流程铱的直收率为61.99%,铱的总收率为95.26%.

Development of high-purity iridium matrixes for spectral analysis

High-purity iridium matrixes used in spectral analysis were developed to meet the request of the new national standards to iridium standard samples.The technological flow of high-purity Ir matrixes for spectral analysis was determined through experimental study.The process was comprised of removing base metal cations by P₂₀₄ solvent extraction,removing precious metal impurities in the form of complex anions by N₂₃₅ solvent extraction,removing Rh and other metal impurities by H₂ reducing in solution,removing trace base metal cations by 732^# exchange resin,precipitating Ir by NH₄Cl,reducing Ir by H₂,and removing Si by HF.The grade of high-purity Ir matrixes is up to 99.999%.In the course of experimental study,the direct recovery rate and the total recovery rate of Ir are 61.99% and 95.26%,respectively.