烧结脱硫石膏的钙相分析

Determination of Calcium Phase in Sinter Desulfurization Gypsum

建立烧结脱硫石膏的钙相分析方法。根据石灰石浆脱硫工艺的特点，利用脱硫石膏中硫酸钙和亚硫酸钙等钙相的不同特征，用EDTA容量法测定总钙，并用ICP法、红外仪器方法测得硫酸钙、亚硫酸钙、碳酸钙等的含量，再利用差减法计算氧化钙的含量。测定结果的相对标准偏差小于1.5%（n=6），硫酸钙、亚硫酸钙、碳酸钙及氧化钙的加标回收率在97%～100%之间。该方法操作简单、快速，可用于烧结脱硫工艺中烧结脱硫石膏钙相的日常检测，实现对脱硫工艺中各阶段反应产物的准确定量。

The analysis method of sintering desulfurization gypsum calcium phase was established. According to the characteristics of limestone slurry desulfurization process, by the different characteristics of calcium sulfate and calcium sulfite calcium phase desulfurization gypsum, total calcium was determined by EDTA volumetric method, and calcium sulfate, calcium sulfite, calcium carbonate were determined by ICP and infrared instrument method, and then the content of calcium oxide was caculated by differential subtraction. The method had the advantages of simple operation with short time,the relative standard deviations of determination results were less than 1.5%（n=6）. The recoveries of calcium sulfate, calcium sulfate,calcium carbonate and calcium oxide were 97%–100%. The method is simple, rapid and can be used for sintering desulfurization process of sintering desulfurization gypsum calcium phase in the daily inspection, implementation of desulfurization technology in various stages of the reaction products accurate quantitative.