Unraveling a Sustainable Process for the Production of High-Strength alpha-Gypsum Using Soda Residues and H2SO4

doi:10.1021/acs.iecr.0c03305

	Unraveling a Sustainable Process for the Production of High-Strength alpha-Gypsum Using Soda Residues and H2SO4
	Wang, Qiaoxin 1,2; Liu, Xia 2; Li, Zhibao 2
刊名	INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
	2020-09-23
卷号	59 期号:38 页码:16516-16526
ISSN号	0888-5885
DOI	10.1021/acs.iecr.0c03305
英文摘要	To advance the state of knowledge and the conventional method of processing soda residues/sludges, this work presents a novel design for the preparation of high-strength CaSO4 center dot 0.5H(2)O (a-gypsum). The two steps included are to (1) produce CaSO4 center dot 2H(2)O (dihydrate, DH) using the discharged soda residues and H2SO4 and (2) transform DH into a-gypsum in a mixed solution with additives at 368 K. A critical step was included to reduce the iron content of the discharged liquor. Thermodynamic properties and phase transition mechanisms were investigated for the solid-liquid systems that involve CaSO4. The composition of the obtained raw soda residues, containing mostly CaCO3 (similar to 60%), was quantified. The influence of the following parameters was studied on the obtained CaSO4 center dot 2H(2)O crystals: the duration of the reaction (1.5-3 h), temperature (333-353 K), solid/liquid ratio of sludge (1:2-1:4), concentration of acids (0.95-2.54 mol/L), and amount of seeded crystals added (5-10%). Marked effects on the evolution of particle sizes and morphological structures were examined. The produced a-gypsum crystals possess an elongated-prismatic or spherical structure, much favored for their excellent injectability and high compressive strength. The most optimal conditions deduced from these experiments can be applied to aid in real industrial design and for the scale-up of the mass production of a-gypsum.
资助项目	National Natural Science Foundation of China[21776279] ; National Natural Science Foundation of China[21978290]
WOS关键词	CALCIUM-SULFATE HEMIHYDRATE ; HCL+CACL2 SOLUTIONS ; PHASE-TRANSITION ; CASO4 PHASES ; FGD GYPSUM ; SOLUBILITY ; SYSTEM ; CRYSTALLIZATION ; MORPHOLOGY ; MODEL
WOS研究方向	Engineering
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000575683100003
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/42344]
专题	中国科学院过程工程研究所
通讯作者	Li, Zhibao
作者单位	1.Univ Chinese Acad Sci, Dept Chem Engn, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Wang, Qiaoxin,Liu, Xia,Li, Zhibao. Unraveling a Sustainable Process for the Production of High-Strength alpha-Gypsum Using Soda Residues and H2SO4[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2020,59(38):16516-16526.
APA	Wang, Qiaoxin,Liu, Xia,&Li, Zhibao.(2020).Unraveling a Sustainable Process for the Production of High-Strength alpha-Gypsum Using Soda Residues and H2SO4.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,59(38),16516-16526.
MLA	Wang, Qiaoxin,et al."Unraveling a Sustainable Process for the Production of High-Strength alpha-Gypsum Using Soda Residues and H2SO4".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 59.38(2020):16516-16526.