用于光谱分析的高纯铱基体的研制

Development of high-purity iridium matrixes for spectral analysis

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%.

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.