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Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime
Deng Licong1,2; Zhang Yifei1; Chen Fangfang1; Cao Shaotao1; You Shaowei1,2; Liu Yan1,2; Zhang Yi1
2013-11-01
Source PublicationCHINESE JOURNAL OF CHEMICAL ENGINEERING
Volume21Issue:11Pages:1303-1312
AbstractThe present work focused on the recycle of the sulfate and the metal ions from acidic wastewater discharged by nonferrous metallurgical industry. The effects of the temperature, the reactant concentration, the stirring speed and the metal ions on the reactive crystallization process of calcium sulfate between sulfuric acid and lime were systematically investigated. The morphology of the precipitated crystals evolved from platelet-like and needle-like shape to rod-like shape when the temperature was increased from 25 to 70 degrees C. An increase in the agglomeration of calcium sulfate was found with increasing lime concentration. Metal ions markedly retard the rate of crystallization of calcium sulfate dihydrate. The crystallization of gypsum was slowed with the existence of Mg2+ in the solution, and the morphology of gypsum was transformed from platelet-like shape to rod-like shape when Mg2+ concentration reached 0.08 mol.L-1. The amorphous ferric hydroxide was coated on the calcium sulfate after the co-precipitation process while Zn2+ and Al3+ ions in the solution enhanced the agglomeration of the calcium sulfate by absorbing on the surface of the crystals. Comprehensive acidic wastewater containing heavy metals was efficiently purified by the two stage lime neutralization technology, and highly agglomerated gypsum precipitates with needle-like shape were obtained. The precipitates could be purified by sulfuric acid washing, and the metal ions were effectively separated from the calcium sulfate by-products.
KeywordReactive Crystallization Acidic Wastewater Lime Milk Calcium Sulfate Dihydrate
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
Language英语
WOS KeywordHEAVY-METALS ; SPONTANEOUS PRECIPITATION ; HYDROXIDE PRECIPITATION ; CHEMICAL PRECIPITATION ; REVERSE-OSMOSIS ; IONS ; GYPSUM ; GROWTH ; SUPERSATURATION ; WASTEWATERS
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000329834700013
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13540
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Deng Licong,Zhang Yifei,Chen Fangfang,et al. Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime[J]. CHINESE JOURNAL OF CHEMICAL ENGINEERING,2013,21(11):1303-1312.
APA Deng Licong.,Zhang Yifei.,Chen Fangfang.,Cao Shaotao.,You Shaowei.,...&Zhang Yi.(2013).Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime.CHINESE JOURNAL OF CHEMICAL ENGINEERING,21(11),1303-1312.
MLA Deng Licong,et al."Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime".CHINESE JOURNAL OF CHEMICAL ENGINEERING 21.11(2013):1303-1312.
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