邻二氮菲分光光度法测定赤泥和石灰石混匀度

Determination of Mixedness Degree of Red Mud and Limestone by Spectrophotometry with 1,10-Phenanthroline

用盐酸提取赤泥和石灰石的混合料后,通过邻二氮菲分光光度法测定提取液中铁含量,进而求得混合料中氧化铁的质量分数,以此来衡量混匀度。结果表明,该法与重铬酸钾法比较,精密度和准确度均无显著性差异,测定混匀度的相对误差在±2%,且方法简便、快速、准确、对环境友好,可用于生产实时监控。

A method for the determination of mixedness degree of red mud and limestone by spectrophotometry with 1, 10-phenanthroline was developed. The mixture of red mud and limestone was dissolved by hydrochloric acid, and iron content in the sample solution was determined by spectrophotometry with 1,10-phenanthroline. The mass fraction of Fe2 03 in the mixture was calculated and used as a representation of mixedness degree. The results of the study show that the new method provides similar precision and accuracy for the mixedness degree determination with the dichromate titration method with relative errors of about 2%. The new method also provides the advantages of simple operation, more efficiency, environment-friendly and is in favor of real-time monitoring in production.