甲基膦酸二-(1-)甲庚酯萃取硝酸锆的机理
THE MECHANISM OF EXTRACTION OF Zr(NO_3)_4 WITH DMHMP
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摘要: 中性磷型萃取剂甲基膦酸二-(1-)甲庚酯(简称DMHMP)在硝酸溶液中萃取硝酸锆生成三种形式萃合物:Zr(NO_3)_4·2DMHMP,Zr(NO_3)_4·2DMHMP·2HNO_3和Zr(NO_3)_4·2DMHMP·3HNO_3。用对数函数外推和优选计算相结合的方法,求得萃取反应平衡常数:K_(020)=1.09×10~3,K_(022)=6.25×10~3,K_(023)=1.50×10~4,求得Zr(NO_3)_i~(4-i)的各级积累稳定常数β_1=2.13,β_2=2.62,β_3=3.39,β_4=6.18。Abstract: Zirconium nitrate can be extracted by Di (1-) methylheptyl methyl phosphonate (DMHMP), a neutral organophosphorus extractant, in nitric acid solutions. Three kinds of extraction complexes are found in the organic phase: Zr (NO3)4·2DMHMP, Zr(NO3)4 ·2DMHMP·2HNO3 and Zr (NO3)4·2DMHMP·3HNO3. Using the log-function extrapolation combined with the optimum computing method, the equilibrium constants of the extracting reactions are determined: K020 = 1.09×103, K022 = 6.25×103, K023= 1.50×104. Stability constants of the complex ions Zr (NO3)*4 f-i are evaluated successively:β1=2.13,
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