分光光度法测定赤泥和石灰石混匀度

Determination for degree of mixedness of red mud and limestone by spectrophotometry

综合利用赤泥对环境治理和资源循环利用具有重大意义,对赤泥进行改性有利于赤泥的综合利用,赤泥和石灰石的混合均匀程度(混匀度)直接影响赤泥的改性效果。为了快速、准确测定混匀度,研究了用盐酸提取赤泥和石灰石混合料中二氧化钛的提取条件。在最佳提取条件下得到提取液后,通过分光光度法测定提取液中二氧化钛的含量,进而求得混合料中二氧化钛的质量分数,以此来衡量混匀度。研究结果表明,该法精密度和准确度均达到要求,用来测定混匀度,相对误差在±2%以内,是一种简便、快速、准确并能进行生产实时监控的方法。

Comprehensive utilization of red mud is significant to environmental improvement and resource recycling. Modification of red mud is favorable to its comprehensive utilization. The degree of mixedness of red mud and limestone directly impacts on modification effect of red mud. In order to determine the degree of mixedness fastly and accurately, extracting conditions of titanium dioxide with hydrochloric acid in the mixture of red mud and limestone were studied. Content of titanium dioxide in extracting solution obtained under the optimal conditions was determined by spectrophotometry, from which the mass fraction of titanium dioxide in the mixture was obtained. And then the degree of mixedness can be measured based on the mass fraction of titanium dioxide in mixture. Research results showed that precision and accuracy of this method are both satisfactory and relative errors are within ± 2%. It is a simple, rapid, and accurate method and can be used as real-time monitoring of production.