文献类型：期刊文献

英文题名：Metastable Zone Width and Primary Nucleation Kinetics for Crystallization of KCl from a KCl-MgCl2-H2O System

作者：Wang, Congying[1];Luo, Mengjie[1];Chen, Hang[1];Wang, Ren[2];Meng, Hao[2];Song, Xingfu[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Joint Int Lab Potassium & Lithium Strateg Resource, Shanghai 200237, Peoples R China;[2]Qinghai Salt Lake Ind Co Ltd, Golmud 816000, Peoples R China

年份：2024

卷号：63

期号：18

起止页码：8330

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20241816017490);WOS:【SCI-EXPANDED(收录号:WOS:001227774500001)】；

基金：The work was supported by the Special Project of Qinghai Province on Enterprise Research Transformation and Industrialization (2022-GX-C14) and Kunlun Talent Program of Qinghai Province for High-end Innovative Talents.

语种：英文

外文关键词：Activation energy - Cooling - Crystallization - Flotation - Molecular dynamics - Nucleation - Optimization - Potassium compounds - Sodium chloride

摘要：Effects of MgCl2 and NaCl mass fraction, stirring rate, cooling rate, and flotation reagent on metastable zone width of KCl in the aqueous system K+, Mg2+//Cl--H2O were investigated by a laser method. Metastable zone width increases with a decrease in stirring rate and saturation temperature and an increase in cooling rate. Moreover, metastable zone width increases significantly with the presence of dodecyl morpholine (DMP). The effect mechanism was revealed by molecular dynamics simulation. It demonstrated that diffusion inhibition in K+ of DMP contributes to the increase in metastable zone width. Furthermore, the self-consistent N & yacute;vlt-like equation and classical 3D nucleation theory were employed to study primary nucleation kinetics of KCl with acceptable accuracy. The activation energies E-sat of the KCl nucleation process calculated by the self-consistent N & yacute;vlt-like equation and classical 3D nucleation theory are 14.88 and 11.91 kJ/mol, respectively. Research on metastable zone width provides a thermodynamic basis for KCl production process optimization from cold decomposition of carnallite.