EGTA滴定法测定萤石中碳酸钙含量准确度的研究

EGTA titration fluorite in the accuracy of calcium carbonate

将经典方法用稀醋酸加热处理试样改为在室温下用稀醋酸定体积、定时间浸取处理试样测定钙总量。将第一次浸出后的残渣，再按前次相同的操作条件浸出一次，在浸出溶液中测定其钙含量即为校正值。从含有部分CaF2的钙总量中减去校正值即得到CaCO3，的真实含量，提高了CaCO3测定的准确度，满足了冶金生产的需要。

The classical method of heating the sample with dilute acetic acid to acetic acid at room temperature with fixed volume, fixed time measurement of calcium leaching treatment the total sample. After the first leach residue, then the previous operating conditions the same leaching time, leaching solution in the calcium content shall be determined correction value. Of calcium from the total amount of CaF2 containing part of the correction value is obtained by subtracting the actual content of CaCO3 CaCO3 improve the accuracy of determination to meet the metallurgical production.