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Unraveling a Sustainable Process for the Production of High-Strength alpha-Gypsum Using Soda Residues and H2SO4
Wang, Qiaoxin1,2; Liu, Xia1; Li, Zhibao1
2020-09-23
Source PublicationINDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
ISSN0888-5885
Volume59Issue:38Pages:16516-16526
AbstractTo 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.
DOI10.1021/acs.iecr.0c03305
Language英语
WOS KeywordCALCIUM-SULFATE HEMIHYDRATE ; HCL+CACL2 SOLUTIONS ; PHASE-TRANSITION ; CASO4 PHASES ; FGD GYPSUM ; SOLUBILITY ; SYSTEM ; CRYSTALLIZATION ; MORPHOLOGY ; MODEL
Funding ProjectNational Natural Science Foundation of China[21776279] ; National Natural Science Foundation of China[21978290]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China
WOS IDWOS:000575683100003
PublisherAMER CHEMICAL SOC
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Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/42345
Collection中国科学院过程工程研究所
Corresponding AuthorLi, Zhibao
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Dept Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
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.
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