硫磺还原分解磷石膏制硫化钙过程磷、氟杂质迁移规律研究

doi:10.19964/j.issn.1006-4990.2024-0092

Abstract

Abstract:

The reduction and decomposition to produce sulfuric acid and low⁃carbon calcium⁃based materials is a powerful way to realize the large⁃scale disposal and circular utilization of phosphogypsum.Clarifying the migration and transformation rules of phosphorus and fluorine，two key impurities in the decomposition process of phosphogypsum，plays an important role in regulating the reaction of sulfur reduction and decomposition of phosphogypsum.This article firstly provided a comprehensive analysis of the properties and composition of phosphogypsum，identifying the forms in which impurities such as phosphorus and fluorine exist within it.By using thermodynamic software to simulate calculations，the phase transformations of these two impurities before and after the reaction were revealed.Utilizing pure gypsum，the key factors affecting the decomposition of phosphogypsum to produce calcium sulfide were explored.Under optimized conditions，the migration and changes of different amounts of phosphorus and fluorine impurities during the decomposition process were investigated.The research results showed that when the temperature was 800 ℃，the reaction time was 2 h，and the molar fraction of sulfur was 40%，the decomposition rate of phosphogypsum could reach more than 98%.Under this condition，phosphorus impurities mainly existed in the solid phase products in the form of insoluble phosphorus，and some eutectic phosphorus would be released and existed in the form of insoluble phosphorus.The fluorine mainly existed in the form of insoluble fluorine，and a small part entered the gas phase products.The research results of this paper could provide certain theoretical guidance for the recycling economy utilization of phosphogypsum.

Key words: sulphur, calcium sulfate, calcium sulfide, phosphogypsum, impurities, transfer law

CLC Number:

TQ126.3

LI Shan, ZHANG Daping, YANG Xiushan, ZHAO Qiang, KONG Xingjian. Study on transfer laws of phosphorus and fluorine impurities during producing calcium sulfide through sulfur reduction decomposition of phosphogypsum[J]. Inorganic Chemicals Industry, 2024, 56(10): 110-117.

Figures/Tables 15

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质量分数/%													pH
SO₃	CaO	总P₂O₅	可溶P₂O₅	枸溶P₂O₅	SiO₂	Fe₂O₃	Al₂O₃	K₂O	Na₂O	总F	可溶F	结晶水	pH
39.46	34.09	1.05	0.21	0.80	2.94	0.11	0.21	0.32	0.03	0.22	0.09	19.52	2.86

矿物名称	质量分数/%	矿物名称	质量分数/%
石膏	92.11	磷灰石	0.05
石英	2.37	钠长石	0.03
钾长石	1.51	石膏（含铁）	0.03
石膏（含硅）	0.64	黄铁矿+石英	0.02
硅酸钾	0.44	石膏（含磷）	0.01
黄铁矿	0.11	金红石	0.01
云母	0.07	萤石	0.01
重晶石	0.05	未知矿物	2.54

矿物	w（P）	w（F）
磷灰石	96.23	0.07
石膏（含硅）	2.12	1.01
石膏（含磷）	0.35	0.03
石膏	1.12	17.45
石英	0.00	18.14
硅酸钾	0.00	41.06
萤石	0.06	0.60
钾长石	0.00	21.09
黄铁矿+石英	0.13	0.00
钠长石	0.00	0.56

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Inorganic Acid-Base-Salt Committee of CIESC

Study on transfer laws of phosphorus and fluorine impurities during producing calcium sulfide through sulfur reduction decomposition of phosphogypsum

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