铪的碘化-电子束熔炼提纯研究

Study on Purification of Hafnium by Iodination-Electron Beam Smelting

通过热力学分析对金属铪的碘化-电子束熔炼提纯工艺及机理进行了研究。结果表明:碘化提纯铪时,由于Zr、Ti和Hf与碘的结合能力非常接近,导致Zr、Ti不可分离;电子束熔炼提纯铪时,W、Nb、Zr、Ti的蒸气压低于或接近Hf的蒸气压,导致其不可分离,Hf熔点附近HfN的分解压很低,不易分解,也不可分离。综合而言,经过金属铪的碘化-电子束熔炼处理后,除了Zr、Ti不可分离外,其余含量较高的元素均可有效分离。实际生产的数据进一步证明了铪的碘化-电子束熔炼提纯机制理论分析的正确性,Fe、Cr、Al、N、O和Si均可与Hf有效分离。

The purification process and mechanism of hafnium metal by iodination-electron beam smelting were studied by thermodynamic analysis.The results show that when hafnium is purified by iodization, Zr and Ti cannot be separated because the binding ability of Zr, Ti and Hf to iodine is very close.When hafnium is purified by electron beam smelting, the vapor pressure of W,Nb, Zr and Ti is lower than or close to that of Hf, which makes them impossible to separate.The decomposition pressure of HfN near the melting point of Hf is very low, which is not easy to decompose and cannot be separated.In general, after metal hafnium iodination-electron beam smelting treatment, except for Zr and Ti which cannot be separated, other elements with relatively high content can be effectively separated.The actual production data further proves the correctness of the theoretical analysis of hafnium iodination-electron beam smelting purification mechanism, and Fe, Cr, Al, N,O and Si can be effectively separated from Hf.