Solubility and Metastable-Zone Width Measurement of K2SiF6 in H2O, HCl, and H3PO4 Solutions

IF 2.4 3区工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of Chemical & Engineering Data Pub Date : 2026-10-08 Epub Date: 2026-09-03 DOI:10.1021/acs.jced.6c00081

Zhengwei Yu, Feng Wu, Guoxiong Wang, Yu Zhang, Jiayu Ma, Dongshen He, Junfeng Zhou

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引用次数: 0

Abstract

The solubility and metastable-zone width (MZW) of K₂SiF₆ in pure water and acid solutions (HCl and H₃PO₄) were determined respectively by the isothermal method and multitemperature conductivity method combined with visual inspection. The effects of saturation temperature (30–70 °C) and the cooling rate (6–24 °C/h) on MZW was investigated. Moreover, the nucleation equation was fitted using the Nývlt equation in classical nucleation theory, and the apparent nucleation order m was calculated. The results showed that the MZW of K₂SiF₆ narrowed with increasing saturation temperature and decreasing cooling rate in all investigated systems. The apparent nucleation order m of K₂SiF₆ in each system increased slightly with increasing temperature. Especially, the m value in H₃PO₄ solution was slightly larger than that in pure water under the same conditions. This study can provide key data and theoretical support for optimizing the crystallization of K₂SiF₆ in acid-leaching solution from phosphorus–potassium-associated ore and preventing scale formation of K₂SiF₆ in wet-process phosphoric acid (WPA) vacuum filtration.

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K2SiF6在H2O、HCl和H3PO4溶液中的溶解度和亚稳带宽度测量

采用等温线法和多温电导率法结合目测法分别测定了K2SiF6在纯水和酸溶液（HCl和h3po4）中的溶解度和亚稳区宽度（MZW）。研究了饱和温度（30 ~ 70℃）和冷却速率（6 ~ 24℃/h）对MZW的影响。利用经典成核理论中的Nývlt方程拟合成核方程，计算了表观成核阶m。结果表明，随着饱和温度的升高和冷却速率的降低，K2SiF6的MZW逐渐缩小。随着温度的升高，各体系中K2SiF6的表观成核阶数m略有增加。特别是在相同条件下，H3PO4溶液中的m值略大于纯水。该研究可为优化磷钾伴生矿酸浸液中K2SiF6的结晶工艺，防止湿法磷酸真空过滤过程中K2SiF6结垢提供关键数据和理论支持。

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来源期刊

Journal of Chemical & Engineering Data 工程技术-工程：化工

CiteScore

5.20

自引率

19.20%

发文量

324

审稿时长

2.2 months

期刊介绍： The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.