低温下钾盐溶解度的测定及液体肥配方研究

doi:10.19964/j.issn.1006-4990.2024-0188

Abstract

Abstract:

The crystallization of potassium salts in high-potassium-content liquid fertilizer at relatively low temperature is closely related to the solubility of potassium salt.In this study，the liquid-solid equilibrium data of KH₂PO₄-KNO₃-H₂O at the low temperature of 278.15 K and 288.15 K，and that of KH₂PO₄-KCl-H₂O at 278.15 K were measured using the isothermal dissolution equilibrium method，and the data was plotted in the phase diagrams with specified crystallization regimes.The results showed that the two systems were simple co-saturated and no double salt or solid solution forms.In two systems，the solubility of potassium salts was increased with the increase of temperature，and according to phase diagrams the K₂O content of co-saturated point was maximum at 278.15 K and 288.15 K.Based on the content requirement of macro-nutrition，highlighted in the NY 1106—2010 standard，the formula of the high-potassium-content liquid fertilizer was analyzed，using the solid-liquid equilibrium data.The results showed that，it was often difficult at the ambient temperature regions，and was not viable at the low temperature regions to meet the required NPK content by only using KH₂PO₄ and KNO₃.The formulas of the liquid fertilizer were designed by adding liquid ammonium polyphosphate（APP） to increase NPK content，the results were validated by experiment.This study could provide reference for the formula design of liquid fertilizer in potassium salt system at low temperature.

Key words: liquid-solid phase equilibrium, liquid fertilizer, formula, potassium dihydrogen phosphate, potassium nitrate

CLC Number:

TQ115

DONG Nan, WANG Nan, JI Lijun, SHENG Yong. Determination of potassium salt solubility at low temperature and study of liquid fertilizer formula[J]. Inorganic Chemicals Industry, 2025, 57(2): 92-97.

Figures/Tables 7

Table 1

Fig.1

Table 2

Fig.2

Fig.3

Table 3

Fig.4

References 17

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序号		液相质量分数/%		平衡固相
序号		KH₂PO₄	KNO₃	平衡固相
278.15 K	1，A	0	0.146 2	KNO₃
	2	0.028 9	0.135 0	KNO₃
	3	0.056 4	0.123 7	KNO₃
	4	0.071 7	0.120 6	KNO₃
	5	0.093 1	0.110 2	KNO₃+KH₂PO₄
	6，B	0.093 3	0.110 1	KNO₃+KH₂PO₄
	7	0.091 6	0.111 6	KH₂PO₄
	8	0.098 4	0.099 2	KH₂PO₄
	9	0.103 6	0.081 0	KH₂PO₄
	10	0.114 9	0.053 4	KH₂PO₄
	11	0.125 4	0.029 5	KH₂PO₄
	12，C	0.150 7	0	KH₂PO₄
288.15 K	1，A₁	0	0.204 8	KNO₃
	2	0.026 5	0.191 5	KNO₃
	3	0.054 9	0.178 8	KNO₃
	4	0.073 6	0.171 8	KNO₃
	5	0.097 1	0.165 4	KNO₃+KH₂PO₄
	6，B₁	0.097 2	0.165 3	KNO₃+KH₂PO₄
	7	0.100 3	0.156 8	KH₂PO₄
	8	0.104 0	0.147 4	KH₂PO₄
	9	0.112 2	0.120 4	KH₂PO₄
	10	0.123 4	0.098 5	KH₂PO₄
	11	0.135 5	0.078 0	KH₂PO₄
	12	0.145 3	0.051 5	KH₂PO₄
	13	0.162 9	0.024 6	KH₂PO₄
	14，C₁	0.174 3	0	KH₂PO₄

序号	液相质量分数/%		平衡固相
序号	KH₂PO₄	KCl	平衡固相
1，A₂	0	0.233 1	KCl
2	0.008 6	0.229 7	KCl
3	0.015 2	0.223 8	KCl
4	0.027 4	0.218 8	KCl
5	0.027 7	0.217 3	KCl
6	0.028 4	0.217 9	KCl+KH₂PO₄
7，B₂	0.028 4	0.217 8	KCl+KH₂PO₄
8	0.029 5	0.210 5	KH₂PO₄
9	0.035 9	0.188 2	KH₂PO₄
10	0.051 6	0.145 4	KH₂PO₄
11	0.068 9	0.095 7	KH₂PO₄
12	0.097 3	0.054 0	KH₂PO₄
13，C₂	0.150 7	0	KH₂PO₄

	物料	ρ（N）	ρ（P₂O₅）	ρ（K₂O）	质量/g
配方1 （2.78-7.04-10.23）	KH₂PO₄	0	52.00	34.00	13.18
	KNO₃	13.50	0	46.00	22.41
	H₂O	0	0	0	100.00
	APP	11.00	37.00	0	9.00
	液体肥（实际）	2.78	7.04	10.23	144.59
配方2 （3.07-10.19-6.87）	KH₂PO₄	0	52.00	34.00	11.71
	KNO₃	13.50	0	46.00	13.82
	H₂O	0	0	0	100.00
	APP	11.00	37.00	0	25.00
	液体肥（实际）	3.07	10.19	6.87	150.53

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Determination of potassium salt solubility at low temperature and study of liquid fertilizer formula

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