氯化钠-硫氰酸钾-正丙醇体系析相萃取分离和富集钛

研究了正丙醇-硫氰酸钾-水体系析相萃取分离和富集Ti的行为及与一些金属离子分离的条件。结果表明, 氯化钠能使正丙醇的水溶液分成两相，在分相过程中， Ti和硫氢化钾生成的Ti(SCN)₆^2-与质子化正丙醇C₃H₇OH₂⁺ 形成的缔合物［Ti(SCN)₆^2-］［C₃H₇OH₂⁺］₂能被正丙醇相完全萃取。当正丙醇、硫氰酸钾和氯化钠的浓度分别为30%（V/V)、8.0×10^-2 mol/L和0.17 g/mL时, Ti的萃取率达到98.9%以上，V、Ce、Mg、Mn、Cd、Cr、Al、Fe、Zn、Ni、Ag 和 W不被萃取，实现了Ti与上述金属离子的分离。对合成水样中的钛进行分离和测定, 结果满意。

Study on extraction and enrichment of titanium by phase separation with sodium chloride-potassium thiocyanate-1-propanol system

The enrichment and extraction behaviors of titanium(Ⅳ) in 1-propanol-potassium thiocyanate-aqueous system and the separation conditions from other metal ions were investigated.The results showed that the 1-propanol aqueous solution could be well divided into two phases in the presence of sodium chloride.The complex of Ti(SCN)62-]C3H7OH2+]2 formed from protonized 1-propanol(C3H7OH2+]2) and Ti(SCN)62-](which was generated by titanium (Ⅳ) and potassium thiocyanate) could be completely extracted by 1-propanol during the phase separation process.When the concentration of 1-propanol,potassium thiocyanate and sodium chloride was 30%(V/V),8.0×10-2 mol/L and 0.17 g/mL,respectively,the extraction yield of titanium(Ⅳ) was higher than 98.9% while ,V(Ⅴ)、Ce(Ⅲ)、Mg(Ⅱ)、Mn(Ⅱ)、Cd(Ⅲ)、Cr(Ⅲ)、Al(Ⅲ)、Fe(Ⅱ)、Zn(Ⅱ)、Ni(Ⅱ)、Ag(Ⅰ)and W(Ⅵ) were not extracted to realize the separation of titanium(Ⅳ) from the above-mentioned metal ions.This method has been successfully applied to the determination and extraction separation of titanium in the sample of synthetic water with satisfactory results.