转炉渣中氟化钙的分析方法研究

Study on Analyzing Method for Calcium Fluoride in Converter Slag

介绍了用EDTA测定转炉渣中CaF2的方法。利用转炉渣中CaO易溶于稀乙酸溶液,CaF2不溶于稀乙酸的特性,试样经稀乙酸处理,过滤不溶物残渣。过滤后的不溶物残渣以硼酸-盐酸溶液浸取定容,移取一定量的溶液,分离铁、铝、锰等离子,用氢氧化钾溶液调节pH>12,用EDTA滴定确定溶液中的CaF2含量。该方法具有一定的精密度和重现性。

The method of measuring and determining calcium fluoride in converter slag with EDTA is introduced. By the utilization of feature that CaO is soluble in dilute acetic acid solution while CaF2 is not, the sample is treated by acetic acid and the undissolved residue is filtered. The undissolved residue is then leached and diluted to volume with boric acid - hydrochloric acid solution. Take a certain amount of solution, separate iron, aluminum and manganese ions, regulate PH value until more than 12 with potassium hydroxide solution and titrate CaF2 content in the solution with EDTA. The said method is of precision and repeatability.