Study on the phase separation extraction and enrichment of iron（Ⅲ） in sodium chloride-ammonium thiocyanate-normal propyl alcohol-water system
SHEN Jiu-ming1, SI Xue-zhi2, LUO Hong-chen1, MA Wan-shan*1
1.College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000，China; 2.College of Chemistry and Chemical Engineering，Henan University of Technology, Zhengzhou 450052, China
Abstract：The phase separation extraction and enrichment behaviour of iron （Ⅲ） in sodium chloride- ammonium thiocyanate- normal propyl alcohol- water system, and the separation conditions of iron from some metal ions were studied. The results showed that, the sodium chloride could separate the normal propyl alcohol aqueous solution into two phases. In this process, the ［Fe（SCN）4~6］［（4~6）-3］- formed from Fe （Ⅲ） and NH4SCN could react with protonized normal propyl alcohol （C3H7OH2+） to form complex ［Fe（SCN）4-6］［ C3H7OH2］1-３, which could be completely extracted by normal propyl alcohol phase. The extraction rate of Fe （Ⅲ） was above 97.5 % under the follow conditions: the pH of solution was 3, the volume fraction of normal propyl alcohol was 30 %, the concentration of NH4SCN solution was 7.0×10-2 mol/L, and the mass concentration of sodium chloride solution was 0.2 g/mL. Meanwhile, W(Ⅵ), Ag（I）, Ce（Ⅲ）, Cr（Ⅲ）, Mn（Ⅱ）, Cd（Ⅱ）, Al（Ⅲ）, Ni（Ⅱ）, Ga（Ⅲ） and Mg（Ⅱ） could not be extracted, realizing the separation of Fe （Ⅲ） from these metal ions. Fe （Ⅲ） in synthetic water samples and nickel-chromium-aluminium alloy was separated and determined, and the results were satisfactory. This extraction system could be used in the separation and enrichment of trace iron, and it had practical value in analysis.
沈久明，司学芝，罗红辰，马万山*. 氯化钠-硫氰酸铵-正丙醇-水体系中铁（Ⅲ）的析相萃取分离和富集研究[J]. 冶金分析, 2011, 31(8): 48-51.
SHEN Jiu-ming, SI Xue-zhi, LUO Hong-chen, MA Wan-shan*. Study on the phase separation extraction and enrichment of iron（Ⅲ） in sodium chloride-ammonium thiocyanate-normal propyl alcohol-water system. , 2011, 31(8): 48-51.
