Modelling of mechanism of agglomeration of KCl crystallization

Abstract

The article presents an analysis into agglomeration during KC1 vacuum crystallization. The theoretical and experimental investigations into the mechanism of agglomeration during mass crystallization result in an extension of the growth phenomena within the known model equations. The basis for this is essentially constituted by the collision model concepts of the theory of floculation in disperse systems. The parameters derived from the microprocess analysis (energy dissipation, content of solids, growth rate of individual grains) lead to model equations which are confirmed by laboratory and test trials.Es wird uber eine Analyse zur Agglomeration bei der Vakuumkristallisation von KCl berichtet. Die theoretischen und experimentellen Untersuchungen zum Agglomerationsmechanismus bei der Massenkristallisation fuhren zu einer Erweiterung der Wachstumsphiinomene in den bekannten Modellgleichungen. Wesentliche Grundlage dafur sind die Kollisionsmodellkonzepte der Flockungstheorie in dispersen Systemen. Die aus der Mikro-prozeI3betrachtung abgeleiteten verfugbaren Parameter (Energiedissipation, Feststoffgehalt, Wachstumsgeschwindigkeit des Einzelkorns) fuhren zu Modellgleichungen, die durch kleintechnische Experimente und Betriebsversuche bestiitigt werden.

The Agglomeration of Niacin Crystals in the Cooling Crystallization Process

“…The agglomeration of crystals was divided into three basic steps: collision, inter‐particle adhesion and simultaneous growth of agglomerates. [ 25,26 ] We speculated the agglomeration mechanism of niacin crystals based on the results above, as shown in Figure . The first stage: the niacin crystals newly formed in the stage of nucleation approach and interconnect with each other; the second stage: the contacting crystal faces form hydrogen bonding and π–π stacking by the functional groups (pyridyl and carboxyl), causing microscopic interactions between specific crystal faces and thus crystal mal‐growth (Figures 4 and 5); the third stage: with the consumption of supersaturation, the mal‐growth agglomerates in the system grow into bundle‐shape crystals (Figure 2).…”

“…Their results indicated that crystal agglomeration is a continuous and dynamic process that undergoes collision, adhesion, and simultaneous growth. [ 25,26 ] In this context, effectively controlling it requires determining the critical steps involved in its process.…”

Enabling Total Process Digital Twin in Sugar Refining through the Integration of Secondary Crystallization Influences

“…Crystallization was modeled using a population balance model, modeling crystal growth, agglomeration, and aggregation as described in the literature [13,15,16,24] written in Equation (3). Crystal nucleation was neglected.…”

“…This work shows a model-based approach to link the evaporation and centrifugal models with a sophisticated crystallization model. For crystallization in general, modeling crystal growth and thereby crystallization end times dependent on the main influence-temperature-has widely been successful [13][14][15][16][17][18] in some cases also including agglomeration or crystal attrition. Other factors, however, such as seed crystal size, amount, or the addition of additives such as esters are likely to influence an industrial sucrose process [2].…”

Patterns of Potassium Chloride Mass Polytermic Crystallization

“…Процесс перекристаллизации чаще всего ведет к уменьшению содержания в осадке мелкодисперсных фракций, повышению степени изометричности кристаллов [6,7]. Управление каждым из указанных процессов требует знаний особенностей их протекания и воздействия этих процессов на конечный гранулометрический состав кристаллизата [8,9].…”