Wang Guangle, Bian Xiao, Shang Zeren, Dong Weibing, Zhang Yi, Wu Songgu
School of Chemistry and Chemical Engineering, Qinghai Minzu University, Xining 810007, China.
State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
Molecules. 2023 Dec 4;28(23):7923. doi: 10.3390/molecules28237923.
The flotation agent is an important collector in the production of potassium chloride and is brought into the crystallization stage with the reflux of the mother liquor. Octadecylamine Hydrochloride (ODA), 1-Dodecylamine Hydrochloride (DAH) and Sodium 1-dodecanesulfonate (SDS) were selected to study their effect on the nucleation of potassium chloride. Focused Beam Reflectance Measurement was used to collect the nucleation-induced periods of KCl in the presence of flotation agents at different supersaturations. Then, empirical equations, classical nucleation theory and growth mechanism equations were employed for data analysis. It was found that the presence of flotation agents increased the nucleation sequence , and (ODA) > (SDS) > (DAH) > (HO). In addition, the interfacial energy data obtained using classical nucleation theory suggest that the flotation agents used in our paper promoted the homogeneous nucleation of KCl (reduced from 5.3934 mJ·m to 5.1434 mJ·m) and inhibited the heterogeneous nucleation of KCl (increased from 2.8054 mJ·m to 3.6004 mJ·m). This investigation also revealed that the growth of potassium chloride was consistent with the 2D nucleation-mediated growth mechanism, and the addition of flotation agent did not change the growth mechanism of potassium chloride. Finally, the particle size distribution results were exactly consistent with the order of nucleation order . The study of nucleation kinetics and growth mechanisms of different flotation agents on potassium chloride can provide guidance for optimizing the production process of potassium chloride and developing new flotation agents.
浮选剂是氯化钾生产中的重要捕收剂，并随着母液的回流进入结晶阶段。选用盐酸十八胺（ODA）、盐酸十二胺（DAH）和十二烷基磺酸钠（SDS）来研究它们对氯化钾成核的影响。采用聚焦光束反射测量法收集在不同过饱和度下存在浮选剂时氯化钾的成核诱导期。然后，使用经验方程、经典成核理论和生长机理方程进行数据分析。研究发现，浮选剂的存在增加了成核顺序，且（ODA）＞（SDS）＞（DAH）＞（HO）。此外，利用经典成核理论获得的界面能数据表明，本文中使用的浮选剂促进了氯化钾的均匀成核（从5.3934 mJ·m²降至5.1434 mJ·m²）并抑制了氯化钾的异质成核（从2.8054 mJ·m²增至3.6004 mJ·m²）。该研究还表明，氯化钾的生长符合二维成核介导的生长机理，且浮选剂的添加并未改变氯化钾的生长机理。最后，粒度分布结果与成核顺序完全一致。研究不同浮选剂对氯化钾的成核动力学和生长机理可为优化氯化钾生产工艺及开发新型浮选剂提供指导。
