硫酸铵-乙醇-硫氰酸钾-水体系萃取Ti^(4+)

Extraction of Ti^(4+) in(NH_4)_2SO_4-Ethanol-KSCN System

研究了乙醇-硫氰酸钾-水体系析相萃取分离和富集钛的行为及与一些金属离子分离的条件。结果表明,硫酸铵能使乙醇的水溶液分成两相,在分相过程中,Ti 4+和硫氰酸钾生成的Ti(SCN)26-与质子化乙醇C2H5OH2+形成的缔合物[Ti(SCN)26-][C2H5OH2+]2能被乙醇相完全萃取。当乙醇、硫氰酸钾和硫酸铵的浓度分别为30%(V/V)、6.0×10-2 mol/L和0.30g/mL时,Ti 4+的萃取率达到96.9%以上,Al 3+、Ni 2+、Mg2+、Cd2+、Zn2+、Cr3+、Fe2+、Pb2+和Mn2+离子基本不被萃取,实现了Ti 4+与上述金属离子的分离。对合成水样中钛的分离和测定,结果满意。

The behavior and conditions of enrichment and extraction separation of Ti4＋ from other metal ions in（NH4）2SO4-ethanol-KSCN system were studied.The results showed that the ethanol aqueous solution could be well divided into two phases in the presence of（NH4）2SO4.The associated [Ti（SCN）2-6][C2H5OH＋2]2 formed with C2H5OH＋2 and Ti（SCN）2-6（combined from Ti4＋ and KSCN） could be completely extracted during this process.Ti4＋ could be quantiatively separated from Al3＋、Ni2＋、Mg2＋、Cd2＋、Zn2＋、Cr3＋、Fe2＋、Pb2＋ and Mn2＋ by extraction.The extraction percentage of Ti4＋ is over 96.9% when the concentrations of ethanol,KSCN and（NH4）2SO4 in solution are 30%（V/V）,6.0×10-2 mol/L and 0.3 g/mL,respectively.The method has been used for the separation and determination of titanium in the sample of synthetic water with satisfactory results.