配位滴定法测量氟硅酸溶液中钙镁含量

Measuring of Calcium and Magnesium Content of Fluorine acid Solution with Ligand Titration

为了研究氟硅酸分解磷尾矿的工艺,文章对含氟硅酸的溶液中钙镁的测定方法进行研究。分别采用EDTA滴定法、EDTA加热滴定法、K+沉淀滴定法、Ba2+沉淀滴定法、Ca Cl2反滴定法、Ca Cl2反滴定加热法等六种方法进行试验。结果表明:在氟硅酸存在的情况下,Ca Cl2反滴定加热法可以消除氟硅酸的溶液中钙、镁总量测定时出现的拖尾现象,并较准确的测定含氟硅酸的溶液中钙、镁总量。

Studied the measurements of calcium and magnesium content of fluorine acid solution to research on process of decomposing phosphate tailings with fluoride acid. Chose the methods of EDTA titration, EDTA titration heating, K precipitation titration, Ba2＋ precipitation titration, Ca Cl2 anti-titration, Ca Cl2 heating back-titration and so on to detect calcium and magnesium content. The results showed that Ca Cl2 back titration method could eliminate the tailing phenomena and determinate accurately in the presence of fluorine acid.