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Solubility of dicalcium silicate in the NaOH-NaAl(OH)(4)-Na2CO3 solutions: Determination and prediction
Alternative TitleHydrometallurgy
Zeng, Lanmu; Li, Zhibao
2014-08-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume147Issue:AUGPages:127-133
AbstractThe utilization of low-grade aluminous materials to produce alumina by the sinter process has been attracted attention as high-grade bauxite ores are diminishing. The sinter process has strict desilication requirement for the precipitation of high quality Al(OH)(3). The knowledge of the behavior and solubility of calcium silicates is highly significant for reducing the amount of silica entered into the liquor. For this reason, the solubility of dicalcium silicate (belite), a main silicon-bearing solids, in the NaOH, mixed NaOH-NaAl(OH)(4) and NaOH-NaAl(OH)(4)-Na2CO3 solutions was determined at temperatures from 303.2 to 343.2 K. Co-precipitates from the reaction between calcium and silicate in the CaCl2-Na2SiO3-NaOH solution were calcined at 1200 degrees C for 4 h to obtain belite. It was found that solubility in 0.5-4 mol L-1 NaOH solutions increases with increasing NaOH concentration and decreases with temperature increment. Solubility of belite in the NaOH-NaAl(OH)4 and NaOH-NaAl(OH)(4)-Na2CO3 solutions demonstrated to increase with the addition of Al(OH)(3) and Na2CO3. The mixed-solvent electrolyte (MSE) model embedded in OLI software was employed to predict the solubility of belite based on the characterization of solid phases with reasonable agreement. This work provides a meaningful knowledge for the clinker dissolution and desilication operation in the sinter process. (C) 2014 Elsevier B.V. All rights reserved.; The utilization of low-grade aluminous materials to produce alumina by the sinter process has been attracted attention as high-grade bauxite ores are diminishing. The sinter process has strict desilication requirement for the precipitation of high quality Al(OH)(3). The knowledge of the behavior and solubility of calcium silicates is highly significant for reducing the amount of silica entered into the liquor. For this reason, the solubility of dicalcium silicate (belite), a main silicon-bearing solids, in the NaOH, mixed NaOH-NaAl(OH)(4) and NaOH-NaAl(OH)(4)-Na2CO3 solutions was determined at temperatures from 303.2 to 343.2 K. Co-precipitates from the reaction between calcium and silicate in the CaCl2-Na2SiO3-NaOH solution were calcined at 1200 degrees C for 4 h to obtain belite. It was found that solubility in 0.5-4 mol L-1 NaOH solutions increases with increasing NaOH concentration and decreases with temperature increment. Solubility of belite in the NaOH-NaAl(OH)4 and NaOH-NaAl(OH)(4)-Na2CO3 solutions demonstrated to increase with the addition of Al(OH)(3) and Na2CO3. The mixed-solvent electrolyte (MSE) model embedded in OLI software was employed to predict the solubility of belite based on the characterization of solid phases with reasonable agreement. This work provides a meaningful knowledge for the clinker dissolution and desilication operation in the sinter process. (C) 2014 Elsevier B.V. All rights reserved.
KeywordDicalcium Silicate Lime Sinter Process Alumina Solubility Thermodynamic Modeling
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2014.05.007
URL查看原文
Indexed BySCI
Language英语
WOS KeywordTRANSPORT-PROPERTIES ; CALCIUM SILICATE ; THERMODYNAMIC PROPERTIES ; HIGH-PRESSURES ; SYSTEMS ; TEMPERATURES ; COMPLEXES ; BEHAVIOR ; MODEL
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000340333100018
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11598
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Lanmu,Li, Zhibao. Solubility of dicalcium silicate in the NaOH-NaAl(OH)(4)-Na2CO3 solutions: Determination and prediction[J]. HYDROMETALLURGY,2014,147(AUG):127-133.
APA Zeng, Lanmu,&Li, Zhibao.(2014).Solubility of dicalcium silicate in the NaOH-NaAl(OH)(4)-Na2CO3 solutions: Determination and prediction.HYDROMETALLURGY,147(AUG),127-133.
MLA Zeng, Lanmu,et al."Solubility of dicalcium silicate in the NaOH-NaAl(OH)(4)-Na2CO3 solutions: Determination and prediction".HYDROMETALLURGY 147.AUG(2014):127-133.
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