鼓风炉渣中氧化钙的测定方法改进

在参照DHF83-B多元素快速分析仪法测定炉渣中氧化钙的基础上，对鼓风炉渣中氧化钙的测定方法进行了改进。用盐酸（1+1）溶样，三乙醇胺掩蔽残留的铁、铝、锰等元素，以钙指示剂作指示剂，于pH值大于12时用EDTA标准溶液滴定氧化钙。EDTA滴定法分析结果的相对标准偏差RSD为2.82%，与DHF83-B多元素快速分析仪法比较，其结果基本一致。该方法具有准确度好、快速简便等优点，适合用于冶炼炉渣中氧化钙含量的测定。

Improving the Analytical Method for Determination of Calcium Oxide in Blast Furnace Slag

Based on the methodology of DHF83B high speed multi-element analysis instrument, we improved the analytical method for determination of calcium oxide in blast furnace slag. We used (1+1) hydrochloric acid to dissolve sample, and use triethanolamine as the masking agents for the residual elements including iron, aluminum, manganese and so on. At pH bigger than 12, EDTA standard solution was used to titrate calcium oxide using calcium indicator as the titration indicator and the content of calcium oxide was determined. Relative standard deviation (RSD) of the EDTA titrimetric method is 2.82%, and the analytical results are basically consistent with those obtained according to the DHF83B methodology. It concluded that our method is accurate, fast and simple and is suitable for application in determination of calcium oxide in melt furnace slag.