Influence of EDTA-2Na on continuous steady state crystallization of monoammonium phosphate (MAP)

化学工业与工程

Chemcial Industry and Engineering

2023, Vol. 40

Issue (1) :72-80 DOI: 10.13353/j.issn.1004.9533.20220825

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Influence of EDTA-2Na on continuous steady state crystallization of monoammonium phosphate (MAP)

QIU Kejia, WU Jingli, LI Xiaobin, XU Dehua, ZHANG Zhiye, WANG Xinlong

Ministry of Education Research Center for Comprehensive Utilization and Clean Processing Engineering of Phosphorus Resources, College of Chemical Engineering, Sichuan University, Chengdu 610065, China

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Abstract Aiming at the problems of the production of high-purity monoammonium phosphate (MAP) by wet process phosphoric acid, such as low yield of phosphorus, difficult utilization of mother liquor and high content of metal ions in crystal, this research put forward a new method of chelation for producing high-purity MAP. Chelator EDTA-2Na was introduced to chelate metal ions to reduce the impurities in crystal during the process of MAP crystallization. In this paper, Focus beam reflectance measurement (FBRM) on-line particle monitoring technology and OptiMax automatic reactor with accurate temperature control module were used to measure the solubility and metastable zone width data. Additionally, the influence of EDTA-2Na on the chord length distribution, morphology, cell parameters of MAP crystal was analyzed, and the effect of EDTA-2Na on the continuous steady state crystallization of MAP was systematically studied.

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	QIU Kejia
	WU Jingli
	LI Xiaobin
	XU Dehua
	ZHANG Zhiye
	WANG Xinlong

Keywords： EDTA-2Na monoammonium phosphate crystallization additive

Received 2022-10-30;

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QIU Kejia, WU Jingli, LI Xiaobin, XU Dehua, ZHANG Zhiye, WANG Xinlong.Influence of EDTA-2Na on continuous steady state crystallization of monoammonium phosphate (MAP)[J] Chemcial Industry and Engineering, 2023,V40(1): 72-80

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