CaCl2和MgCl2及其复合溶液制备α-半水石膏

doi:10.19964/j.issn.1006-4990.2023-0484

Abstract

Abstract:

In order to improve the utilization rate and added value of phosphogypsum，α-hemihydrate gypsum was prepared from phosphogypsum by atmospheric hydrothermal synthesis method.The effects of CaCl₂，MgCl₂ and their composite solutions on the dehydration rate，phase composition and microcrystal morphology of α-hemihydrate gypsum prepared by atmospheric hydrothermal preparation of phosphogypsum were studied.It was found that phosphogypsum could be dehydrated and recrystallized to form α-hemihydrate gypsum in CaCl₂ solution，MgCl₂ solution and CaCl₂-MgCl₂ composite solution at 95 ℃.In CaCl₂ solution and MgCl₂ solution，the formation rate of α-hemihydrate gypsum accelerated with the increase of salt solution concentration，in which phosphogypsum could be completely reacted into α-hemihydrate gypsum after reaction of 35%CaCl₂ solution for 4 h or 25%MgCl₂ solution for 1 h.In the CaCl₂-MgCl₂ composite solution，the dehydration and conversion rate of phosphogypsum gradually accelerated with the increase of the concentration of MgCl₂ solution.When the mass fraction of CaCl₂ was≤19% and the mass fraction of MgCl₂ was≥11%，the hydrothermal reaction of phosphogypsum for 1 h could form α-hemihydrate gypsum with relatively complete particle distribution.

Key words: phosphogypsum, CaCl₂, MgCl₂, complex solution, α-hemihydrate gypsum

CLC Number:

TQ177.373

HU Cheng, LIU Meng, XIANG Weiheng, CHEN Ping, WANG Neng, LU Guanju, ZHOU Jinlan. Preparation of α-hemihydrous gypsum from CaCl₂ and MgCl₂ and their composite solution[J]. Inorganic Chemicals Industry, 2024, 56(7): 112-117.

Figures/Tables 9

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溶液种类	质量分数/%	反应时间/h	物相组成
溶液种类	质量分数/%	反应时间/h	二水石膏	α-半水石膏	石英
CaCl₂溶液	20	4	39.0	56.4	4.6
	25		11.1	87.0	1.9
	30		3.4	94.2	2.4
	35		0.0	94.8	5.2
MgCl₂溶液	20	4	26.7	70.1	3.2
	25		0.0	97.6	2.4
	30		0.0	93.0	7.0
	35		0.0	95.1	4.9
CaCl₂-MgCl₂复合溶液	25%CaCl₂， 5%MgCl₂	1	7.4	87.3	5.3
	20%CaCl₂， 10%MgCl₂ 19%CaCl₂， 11%MgCl₂		1.7 0.0	90.6 95.6	7.6 4.4
	15%CaCl₂， 15%MgCl₂		0.0	93.0	7.0
	10%CaCl₂， 20%MgCl₂		0.0	96.7	3.3

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Preparation of α-hemihydrous gypsum from CaCl₂ and MgCl₂ and their composite solution

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Preparation of α-hemihydrous gypsum from CaCl2 and MgCl2 and their composite solution