蒸压参数与杂质对磷石膏制备α-半水石膏的影响

doi:10.19964/j.issn.1006-4990.2021-0303

Abstract

Abstract:

By analyzing the phase composition,relative crystallinity,drying compressive strength and microscopic morphology of the samples after autoclaving of phosphogypsum,the effect of autoclavic temperature,holding time,liquid-solid ratio and impurities on the preparation of α hemihydrate phosphogypsum by autoclavic compaction was studied.The results showed that the drying compressive strength of the samples obtained after autoclaving of phosphogypsum was positively correlated with the relative crystallinity of α hemihydrate gypsum crystals.When the autoclaved temperature was 130 ℃,the holding time was 3~5 h,and the liquid-solid ratio was 0.25,the obtainedα-hemihydrate gypsum had high relative crystallinity,high drying com-pressive strength,complete crystal micromorphology and small aspect ratio.Impurities in phosphogypsum would affect the me-chanical strength of autoclaved samples.After the phosphogypsum was washed with water,the α hemihydrate gypsum with a 2 h flexural strength of 7.3 MPa and a drying compressive strength of 32.8 MPa could be prepared under the conditions of au-toclaved temperature of 130 ℃,holding time of 3 h and liquid-solid ratio of 0.25,which was in line with the requirement of α30 strength grade in JC/T 2038—2010“α-type high strength gypsum”.

Key words: phosphogypsum, α-hemihydrate gypsum, autoclaved, relative crystallinity, strength

CLC Number:

TU528.47

CHEN Jinwen,YI Yun,ZHANG Hui,LIU Fei,YANG Lin,CAO Jianxin. Effect of autoclave parameters and impurities on preparation of α-hemihydrate gypsum from phosphogypsum[J]. Inorganic Chemicals Industry, 2022, 54(3): 91-96.

Figures/Tables 10

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References 15

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石膏样品	化学成分及质量分数/%
石膏样品	CaSO₄·2H₂O	Al₂O₃	SiO₂	MgO	Fe₂O₃	w-P₂O₅	w-F
PG	92.00	0.20	3.66	0.07	0.13	0.78	0.10
WPG	95.19	0.10	3.21	0.01	0.07	0.08	0.01
NPG	85.58	—	—	—	—	—	—

石膏原料	各物相质量分数/%
石膏原料	CaSO₄·2H₂O	CaSO₄·0.5H₂O	CaSO₄
PG	1.37	90.63	—
WPG	12.28	82.91	—
NPG	—	81.16	4.42

石膏原料	标准稠度需水量/%	凝结时间/min		力学强度/MPa
石膏原料	标准稠度需水量/%	初凝	终凝	2 h抗折强度	烘干抗压强度
PG	52	7	8	3.3	21.5
WPG	36	5	6	7.3	32.8
NPG	49	18	19	3.8	17.3

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effect of autoclave parameters and impurities on preparation of α-hemihydrate gypsum from phosphogypsum

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