制浆造纸碱回收流程中结盐机理的初步分析

Preliminary analysis on mechanism of crystal in alkali recycling process of pulp and paper manufacture industry

结盐是制浆造纸碱回收行业中普遍存在的现象.文中给出碱回收生产原理及工艺流程,检测结盐最严重的绿液槽至消化器工作段中的绿液固相颗粒粒径大小和分布情况,并对绿液成分与管道凝结固相成分进行分析比较.得到结盐机理的初步结论:绿液的流动属于悬浮体固液两相流动;结盐是此流动中部分晶体颗粒由于絮凝、沉降以及吸附等作用的结果;结盐的程度与固液两相流的粒径大小与分布有关,且伴有化学反应,应该将两者结合起来研究.

Crystal is a common phenomenon in alkali recycling process of pulp and paper manufacture industry. The principle and process of recycling and the serious crystal phenomenon are introduced. The diameter distribution of the particles and the difference between the component of green liquor and crystal in pipeline which is linked from green liquor pot to assimilation apparatus are examined and analyzed. The preliminary conclusion on the flow pattern is that the flow of green liquor is solid-liquid two phase flow of suspending entity, the mechanism of crystal is produced by the sedimentation, flocculation, and adsorption of particles. Therefore, the degree of crystal is closely related to the diameter distribution of particles in the flow.Moreover, for the metal elements in the pipeline coagulation which are not in green li-quor, the process is not only physical but also chemical, therefore, it should be studied comprehensively.