Solid − liquid phase diagram of the KNO3 - Ca(NO3)2 - Mg(NO3)2 - H2O system at 313.15 K

被引：0

作者：

Zeng, Xiangxia ^{[1
]}

Zhang, Tao ^{[1
]}

Lv, Li ^{[1
]}

Tang, Wenxiang ^{[1
]}

Zou, Zongpeng ^{[1
]}

Tang, Shengwei ^{[1
]}

机构：

[1] Multi-phase Mass Transfer and Reaction Engineering Lab, School of Chemical Engineering, Sichuan University, Chengdu

来源：

Chinese Journal of Chemical Engineering | 2025年 / 78卷

关键词：

BET model; Calcium nitrate; Liquid water-soluble fertilizer; Magnesium nitrate; Phase equilibria;

D O I：

10.1016/j.cjche.2024.11.002

中图分类号：

学科分类号：

摘要：

The enrichment of low-grade phosphate rock is an important process to realize sustainable support of phosphorus resources. An aqueous solution containing Ca(NO3)2 and Mg(NO3)2 is produced during the enrichment of low-grade phosphate rock by leaching of HNO3 or calcination coupling with leaching of NH4NO3 solution. Preparation liquid fertilizer is a preferential way to utilize it. The liquid−solid phase diagrams of Ca(NO3)2-Mg(NO3)2-H2O, KNO3-Mg(NO3)2-H2O, KNO3-Ca(NO3)2-H2O and KNO3-Ca(NO3)2-Mg(NO3)2-H2O systems at 313.15 K were studied by isothermal dissolution equilibrium method. Two crystallization regions of Ca(NO3)2·4H2O and Mg(NO3)2·6H2O were observed in the phase diagram of the ternary system Ca(NO3)2-Mg(NO3)2-H2O, a liquid fertilizer with a maximal total nutrient content of 27.46% and a nutrients ratio of N:Ca:Mg = 8.40:10.37:1 can be formed. A homogenous solution can be formed by mixing Ca(NO3)2·4H2O and Mg(NO3)2·6H2O. In the ternary system KNO3-Mg(NO3)2-H2O, the crystallization regions of KNO3, Mg(NO3)2·6H2O and the co-crystallization region of KNO3 and Mg(NO3)2·6H2O were observed. The obtained maximal total nutrient content of liquid fertilizer is 23.32% with the ratio of N:K2O = 1:3.39. In the ternary system KNO3-Ca(NO3)2-H2O, the crystallization regions of Ca(NO3)2·4H2O and KNO3 were observed. The obtained maximal total nutrient content of liquid fertilizer is 38.41% with the ratio of N:K2O:Ca = 1.05:1.18:1. A homogenous solution can also be formed by mixing Ca(NO3)2·4H2O and KNO3 directly. In the quaternary system KNO3-Ca(NO3)2-Mg(NO3)2-H2O, the crystallization regions of Ca(NO3)2·4H2O, Mg(NO3)2·6H2O and KNO3 and the co-crystallization region of KNO3 and Mg(NO3)2·6H2O were observed. The obtained maximal total nutrient content of liquid fertilizer is 38.41% with the ratio of N:K2O:Ca = 1.05:1.18:1. The modified BET model was successfully used to fit the solubility curves. The results can provide a guidance for the formulation of water-soluble fertilizers of N-(K, Ca, Mg). © 2024 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press Co., Ltd. (CIP)

引用

页码：93 / 107

页数：14

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