Preparation of High-Purity Potassium Chloride Crystal Particles in an Octadecylamine Hydrochloride–Water System: The Correlation Between Morphology and Purity

IF 2.9 4区材料科学 Q2 CRYSTALLOGRAPHY

Crystals Pub Date : 2025-11-05 DOI:10.3390/cryst15110958

Yuchun Ren, Leo C. Song, Mingyang Chen, Hai‐Tao Feng, Mingxuan Li, Jiaoyu Peng

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引用次数: 0

Abstract

In salt lake KCl cold decomposition–direct flotation for K-Na separation, octadecylamine hydrochloride (ODA-H) acts as a collector, reducing product purity and limiting high-end applications of salt lake KCl. To study KCl purification mechanisms and optimize crystal properties, this study investigates ODA-H aqueous systems. By regulating the cooling rate, stirring rate, and ODA-H concentration, the crystallization purification of KCl and precise control of its morphology were achieved, ultimately yielding three typical crystal morphologies: cubic, spherical, and ellipsoidal. Of the three crystal morphologies, spherical crystals have the best flowability but lowest purity. Ellipsoidal crystals have better flowability than cubic ones: their purity exceeds that of cubic crystals before washing but falls below it after washing. Cubic crystals, with poorer flowability, reach the highest purity post-washing. This study provides a theoretical basis for enhancing purity via crystal morphology regulation and industrial-scale purification of salt lake KCl.

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在十八胺-水体系中制备高纯氯化钾晶体颗粒：形态与纯度的关系

盐湖氯化钾冷分解—直接浮选分离钾钠时，盐酸十八胺（ODA-H）作为捕收剂，降低了产品纯度，限制了盐湖氯化钾的高端应用。为了研究KCl的净化机理和优化晶体性能，本研究对ODA-H水溶液体系进行了研究。通过调节冷却速率、搅拌速率和ODA-H浓度，实现了KCl的结晶纯化和形态的精确控制，最终得到立方、球形和椭球状三种典型晶体形态。三种晶体形态中，球形晶体流动性最好，但纯度最低。椭球晶体的流动性优于立方晶体，其纯度在洗涤前超过立方晶体，洗涤后低于立方晶体。立方晶体，流动性较差，水洗后纯度最高。本研究为盐湖氯化钾晶体形态调控提高纯度及工业化提纯提供了理论依据。

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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.