溶剂萃取法净化盐酸法湿法磷酸的研究进展

doi:10.19964/j.issn.1006-4990.2021-0093

Abstract

Abstract:

The hydrochloric acid route for producing phosphoric acid has the advantages of environmental protection and low-grade ore adaptability compared with the sulfuric acid route.The steps of typical IMI process for purification of the hydrochlo-ric acid route phosphoric acid by solvent extraction was reviewed this paper.The progress and current situation of the solvent extraction method was discussed.The advantages and disadvantages of commonly used solvents were presented as well.The inherent disadvantages of hydrochloric acid route were reviewed and the corresponding solution and suggestion were proposed.The steps of IMI process were acidulation,solvent extraction,concentration and extractant recovery.Solvent extraction was the core step,in which n-butanol and/or isoamyl alcohol and tri-n-butyl phosphate were commonly used as the extractants.Tri-n-butyl phosphate had the advantages of stronger extraction ability,higher selectivity and lower solubility compared with low aliphatic alcohols.The hydrochloric acid route encountered the inherent disadvantages of dilute purified phosphoric acid with hydrochloric acid,difficult utilization of CaCl₂ waste liquid and high anticorrosion requirement of equipment,which could not be completely overcome even though the micro-chemical technology of high precise control was applied.It could be concluded that the large-scale industrial application of hydrochloric acid route may be put into action under the specific geographical area or specific era background.

Key words: extraction, phosphoric acid, hydrochloric acid, wet process, purify

CLC Number:

TQ126.35

Ran Ruiquan,Jin Yang,Liu Hui,Li Jun,Zhang Jun,Chen Ming. Research progress purification of solvent extraction of wet-process phosphoric acid by hydrochloric acid route[J]. Inorganic Chemicals Industry, 2021, 53(7): 18-22.

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References 35

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Research progress purification of solvent extraction of wet-process phosphoric acid by hydrochloric acid route

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