球形氯化钾结晶过程与聚结机理研究

doi:10.19964/j.issn.1006-4990.2020-0488

Abstract

Abstract:

Aiming at the problems of unknown crystallization process and agglomeration mechanism of spherical KCl,two different morphologies of KCl at different crystallization stages were prepared and the crystal morphology and particle size distribution were characterized by cooling crystallization method through process sampling.Thus,the crystallization process of spherical KCl was comparatively analyzed.Based on the thermodynamics of crystallization,the classical Wetting Theory and the Lifshitz-Van der Waals acid-base approach,it was explained that the main mechanism of the formation of spherical KCl was that the width of crystallization metastable zone had been narrower and the adhesion free energy between crystal particles in the solution had been increased by addition of additives.Therefore,it was easier for the system to achieve spherical crystallization by agglomeration.The simultaneous adjustment of the reduction of the metastable zone and the increase of adhesion free energy between crystal particles in the solution was helpful to realize the spherical crystallization of KCl.

Key words: KCl, sphericity, rystallization process, agglomeration mechanism

CLC Number:

TQ131.13

Chen Xulong,Dong Weibing,Wan Junfeng,Wang Dongdong,Wang Gang. Study on the crystallization process and agglomeration mechanism of spherical KCl[J]. Inorganic Chemicals Industry, 2021, 53(7): 53-57.

Figures/Tables 7

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References 16

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样品	γ_L/（mN·m^-1）	cosθ	?G_SLS/（mJ·m^-2）
普通形貌	72.32	0.240	-26.47
球形	78.57	0.085	-48.36

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Inorganic Acid-Base-Salt Committee of CIESC

Study on the crystallization process and agglomeration mechanism of spherical KCl

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