多级闪蒸蒸发在氧化铝生产中的应用探讨

Discussion on application of multi-stage flash evaporation to alumina production

管式降膜蒸发和多级闪蒸蒸发是拜耳法氧化铝生产中较为成熟的蒸发技术,不同的蒸发技术有不同的适用条件,其经济性也不一样。本文介绍了多级闪蒸蒸发的工艺流程及应用案例,与管式降膜蒸发进行了比较,对于三种不同的多级闪蒸蒸发流程进行了测算分析,给出了可能的使用条件,为氧化铝行业从业者合理选择蒸发工艺提供了借鉴。

Tubular falling film evaporation and multi-stage flash evaporation are relatively mature evaporation technologies in Bayer process alumina production.Different evaporation technologies have different applicable conditions with various economics as well.This paper introduces the process flow and application cases of multi-stage flash evaporation,which are compared with those of tubular falling film evaporation.Three kinds of different multi-stage flash evaporation processes are calculated and analyzed,with possible application conditions put forward,thus providing reference for alumina industry counterparts to choose evaporation process reasonably.