Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium Salt
With the continuous development of the potash industry in salt lakes, the preparation of low-natrium salt for the green and environmentally friendly utilization of potassium and sodium resources in salt lakes has become a research hotspot. The primary method involves obtaining potassium brine from s...
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MDPI AG
2025-05-01
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| author | Yanfang Ma Shouyan Huang Xin Liu Xujie Shi Yongsheng Du Haining Liu |
| author_facet | Yanfang Ma Shouyan Huang Xin Liu Xujie Shi Yongsheng Du Haining Liu |
| author_sort | Yanfang Ma |
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| description | With the continuous development of the potash industry in salt lakes, the preparation of low-natrium salt for the green and environmentally friendly utilization of potassium and sodium resources in salt lakes has become a research hotspot. The primary method involves obtaining potassium brine from salt-lake brine through evaporation and then subjecting this mineral to transformation crystallization to obtain low-natrium salt crystals. In the crystallization vessel, a potassium−sodium-saturated solution is introduced, followed by the addition of an appropriate amount of water and solid magnesium chloride. After a thorough reaction, the solid−liquid separation yields the target product of low-natrium salt. Subsequently, the surface properties of KCl and NaCl crystals were calculated using first-principles methods. The research findings revealed that potassium chloride crystals, when they contained defects, readily adsorbed Na<sup>+</sup> and NaCl. In a sodium−potassium-saturated system, KCl and NaCl easily formed heterojunctions, leading to embedded crystallization as the Mg<sup>2+</sup> concentration increased in this saturated system. Feed rate and residence time directly affect the purity of low-natrium salt. A low-natrium salt meeting the requirements can be obtained after a residence time of more than 80 min under the following conditions. |
| format | Article |
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| institution | OA Journals |
| issn | 2297-8739 |
| language | English |
| publishDate | 2025-05-01 |
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| series | Separations |
| spelling | doaj-art-45c1a4f4111b41dba8e2a241399abb8b2025-08-20T02:33:51ZengMDPI AGSeparations2297-87392025-05-0112513110.3390/separations12050131Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium SaltYanfang Ma0Shouyan Huang1Xin Liu2Xujie Shi3Yongsheng Du4Haining Liu5Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaUniversity of Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaUniversity of Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaKey Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaWith the continuous development of the potash industry in salt lakes, the preparation of low-natrium salt for the green and environmentally friendly utilization of potassium and sodium resources in salt lakes has become a research hotspot. The primary method involves obtaining potassium brine from salt-lake brine through evaporation and then subjecting this mineral to transformation crystallization to obtain low-natrium salt crystals. In the crystallization vessel, a potassium−sodium-saturated solution is introduced, followed by the addition of an appropriate amount of water and solid magnesium chloride. After a thorough reaction, the solid−liquid separation yields the target product of low-natrium salt. Subsequently, the surface properties of KCl and NaCl crystals were calculated using first-principles methods. The research findings revealed that potassium chloride crystals, when they contained defects, readily adsorbed Na<sup>+</sup> and NaCl. In a sodium−potassium-saturated system, KCl and NaCl easily formed heterojunctions, leading to embedded crystallization as the Mg<sup>2+</sup> concentration increased in this saturated system. Feed rate and residence time directly affect the purity of low-natrium salt. A low-natrium salt meeting the requirements can be obtained after a residence time of more than 80 min under the following conditions.https://www.mdpi.com/2297-8739/12/5/131brinepotassium chloridesodium chloridelow-natrium saltsurfaceheterojunction |
| spellingShingle | Yanfang Ma Shouyan Huang Xin Liu Xujie Shi Yongsheng Du Haining Liu Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium Salt Separations brine potassium chloride sodium chloride low-natrium salt surface heterojunction |
| title | Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium Salt |
| title_full | Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium Salt |
| title_fullStr | Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium Salt |
| title_full_unstemmed | Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium Salt |
| title_short | Surface Properties of NaCl and KCl in a Potassium−Sodium-Saturated System with Low-Natrium Salt |
| title_sort | surface properties of nacl and kcl in a potassium sodium saturated system with low natrium salt |
| topic | brine potassium chloride sodium chloride low-natrium salt surface heterojunction |
| url | https://www.mdpi.com/2297-8739/12/5/131 |
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