萃取法脱除磷酸二氢钾生产废水中氯离子的研究

doi:10.19964/j.issn.1006-4990.2025-0025

Abstract

Abstract:

In response to the challenging issue of treating high-concentration chloride-containing wastewater generated during the production of monopotassium phosphate（MKP），a method for removing chloride ions from wastewater using trioctylamine（TOA） as an extractant was proposed.The effects of factors such as extractant formulation，extraction phase ratio，temperature and time on chloride ion removal rate were investigated，and the conditions for countercurrent extraction stages and stripping were explored.The results showed that under the conditions of an extractant formulation with a volume ratio of TOA，isooctyl alcohol，and kerosene at 2∶1∶7，with a phase ratio of 1∶1，an extraction temperature of 25 ℃，and an extraction time of 10 minutes，chloride ion concentration in the wastewater was decreased from 7500 mg/L to 294 mg/L after three stages of countercurrent extraction，achieving a chloride removal rate of 96.08%.Using 5 mol/L ammonia solution for three stages of countercurrent stripping with a phase ratio of 6∶1，the stripping rate reached 95.43%.The extraction mechanism was analyzed using the slope method and infrared spectroscopy，revealing that the extraction process followed an ion association-ion exchange mechanism，with a chloride-to-TOA molar ratio of 1∶1 in the extracted complex.This study presented an effective method for removing chloride ions from MKP production wastewater，preventing corrosion of equipment during subsequent treatment stages and providing a new approach for the treatment of chloride-containing wastewater in MKP production.

Key words: monopotassium phosphate, wastewater treatment, extraction method, chloride removal

CLC Number:

TQ115

CHEN Taizun, LI Jun, JIN Yang. Study on removal of chloride ions from wastewater produced in production of monopotassium phosphate using extraction method[J]. Inorganic Chemicals Industry, 2026, 58(2): 92-99.

Figures/Tables 13

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References 30

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样品	质量浓度/（mg·L^-1）
样品	Cl^-	H₂PO₄^-	F^-	SO₄^2-	Na⁺	K⁺	氨氮 COD
废水	7 500	29 745	1 100	1 440	2 100	13 600	3 400	1 150

级数	ρ（Cl^-）/（mg·L^-1）	级数	ρ（Cl^-）/（mg·L^-1）
原液	7 500	二级	591
一级	1 993	三级	294

样品	质量浓度/（mg·L^-1）
样品	Cl^-	H₂PO₄^-	F^-	SO₄^2-	Na⁺	K⁺	氨氮 COD
萃取后废水	294	29 538	481	12 498	2 100	13 600	3 400	1 430

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Inorganic Acid-Base-Salt Committee of CIESC

Study on removal of chloride ions from wastewater produced in production of monopotassium phosphate using extraction method

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