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利用氧化钙易溶解于稀醋酸,而氟化钙不溶解于稀醋酸的特性。试样以稀醋酸处理,用滤纸过滤不溶解物残渣,滤液加氢氧化钾溶液调节pH≥12.5,用EGTA滴定法测定CaO含量。过滤的不溶解物残渣在铂金坩埚中灰化、灼烧,加含有硼酸钠的混合熔剂,于950℃左右熔融、酸化浸取定容、分液后,加氢氧化钾溶液调节pH≥12.5,用EGTA滴定法测定CaF2含量。
The use of calcium oxide is easily dissolved in dilute acetic acid, and calcium fluoride is not soluble in dilute acetic acid characteristics. The sample is treated with dilute acetic acid, and the insoluble residue is filtered through filter paper. The filtrate is adjusted with potassium hydroxide solution to have pH≥12.5, and the content of CaO is determined by EGTA titration. Filtered insoluble residue in a platinum crucible ashing, burning, plus mixed flux containing sodium borate, melted at 950 ℃, acidification leaching volume, liquid separation, add potassium hydroxide solution to adjust the pH ≥ 12.5, Determination of CaF2 content by EGTA titration.