磷矿在磷酸中的浸出行为

doi:10.19964/j.issn.1006-4990.2022-0103

Abstract

Abstract:

In order to improve the production process of wet-process phosphoric acid,improve the quality of by-product phosphogypsum,and relieve the environmental pressure caused by the solid by-products in the wet-process phosphoric acid,the research on phosphorus-sulfur two-step decomposition of phosphate ore to produce phosphoric acid was conducted.The leaching behavior of a phosphate ore in GuiYang in phosphoric acid was especially studied.The results showed that when the particle size of phosphate ore was less than 75 μm,the stirring speed was 500 r/min,the reaction temperature was 70 ℃,the w（P₂O₅） was 40% and the reaction time was 60 min,the decomposition rate of phosphate ore reached 98.5%.The decomposition rate of phosphate ore in 40% P₂O₅ could be described by the Drozdov kinetic empirical model well.The reaction retardation coefficient was large,and the apparent activation energy of the reaction was 6.048 kJ/mol.It was shown that the decomposition of phosphate ore by 40% P₂O₅ was controlled by diffusion.SEM and EDS analysis of the residues showed that the crystallization of calcium dihydrogen phosphate was the main factor affecting the diffusion.

Key words: phosphate ore, wet phosphoric acid, calcium dihydrogen phosphate, kinetics

CLC Number:

TQ126.3

ZHENG Hanxiao,LÜ Li,TANG Shengwei,HE Yanjun,ZHANG Tao. Leaching behavior of phosphate ore in phosphoric acid[J]. Inorganic Chemicals Industry, 2022, 54(10): 96-101.

Figures/Tables 11

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成分	质量分数/%	成分	质量分数/%
P₂O₅	36.48	MgO	0.86
CaO	51.28	Fe₂O₃	0.72
F	2.56	酸不溶物	7.08
Al₂O₃	1.02

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Leaching behavior of phosphate ore in phosphoric acid

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