Solubility and K-SP of Mg4Al2(OH)(14)center dot 3H(2)O at the various ionic strengths
文献类型：期刊论文
| 作者 | Gao, Wencheng; Li, Zhibao |
| 刊名 | HYDROMETALLURGY
 |
| 出版日期 | 2012-04-01 |
| 卷号 | 117期号:0页码:36-46 |
| 关键词 | Mg4Al2(OH)14 center dot 3H(2)O Co-precipitation Solubility product (K-SP) Chemical modeling Bromley-Zemaitis equation |
| ISSN号 | 0304-386X |
| 通讯作者 | Li, ZB |
| 英文摘要 | Mg4Al2(OH)(14)center dot 3H(2)O was prepared from co-precipitation of magnesium and aluminum in mixed MgCl2-AlCl3 solutions. The solid prepared in the condition of initial C-Al=0.0625 M, Mg/Al = 2, at 323.2 K was confirmed to be Mg4Al2(OH)(14)center dot 3H(2)O by XRD, chemical analysis, and TGA. Since it was very difficult to obtain the supemate through filtration in order to determine the solubility of Mg4Al2(OH)(14)center dot 3H(2)O in pure water, the solubility of Mg-4-Al-2(OH)(14)center dot 3H(2)O in 0.1-2.0 M NaCl solutions was measured in the temperature range of 298.2-333.2 IC. The log Ksp for the reaction Mg4Al2(OH)(14)center dot 3H(2)O(4) double left right arrow 4Mg(2+) + 2A1(OH)(4)(-) + 6OH(-) + 3H(2)O at 298.2 K was determined to be -49.09. The activity coefficients of ions and activity of water in the Mg4Al2(OH)(14)center dot 3H(2)O-saturated NaCI solutions were calculated by the Bromley-Zemaitis and Meissner equations with the help of the OLI software. The solubility product increases linearly with the inverse of temperature suggesting a constant enthalpy of reaction at 298.2-333.2 K. On the basis of solubility product regression, the free energy of formation, Delta G(f)(0).(298.15K)(Mg4Al2(OH)(14)center dot 3H(2)O), was obtained with a value of -6365.50 kJ center dot mol(-1). The enthalpy and entropy of reaction, Delta H-r(0) and Delta S-r(0), were also calculated from linear regression to be -145.57 kJ center dot mol(-1) and -1429 J center dot mol(-1), respectively. Using values for log K-SP, Delta H-r(0), Delta S-r(0) and partial molal quantities for the constituent ions, the enthalpy of formation Delta H-f(0).298.15K and the entropy of formation Delta S-f.98.15K were obtained and were -7145.05 kJ.mol(-1) and 1241 J.mol(-1).K-1, respectively. The heat capacity of Mg4Al2(OH)(14)center dot 3H(2)O was determined to be -485 J.mol(-1).K-1 assuming Delta C-p,r(0)=0. In addition, the precipitation diagrams of Al(OH)(3). Mg4Al2(OH)(14)center dot 3H(2)O, and Mg(OH)(2) were successfully constructed with the aid of the newly obtained K-SP of Mg4Al2(OH)(14)center dot 3H(2)O. These show that Mg4Al2(OH)(14)center dot 3H(2)O can only be obtained from mixed MgCl2-AlCl3 solutions (Mg/Al ratio =2) with magnesium concentration <1 M and pH above 6. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Metallurgy & Metallurgical Engineering |
| 研究领域[WOS] | Metallurgy & Metallurgical Engineering |
| 关键词[WOS] | MGAL2O4 SPINEL POWDERS ; MAGNESIUM-HYDROXIDE ; THERMODYNAMIC PROPERTIES ; STRONG ELECTROLYTES ; ALUMINUM-HYDROXIDE ; AQUEOUS-SOLUTIONS ; HIGH-PRESSURES ; TEMPERATURES ; MECHANISMS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000303486500006 |
| 公开日期 | 2013-10-18 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/3822]  |
| 专题 | 过程工程研究所_湿法冶金清洁生产技术国家工程实验室 |
| 作者单位 | Chinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, Wencheng,Li, Zhibao. Solubility and K-SP of Mg4Al2(OH)(14)center dot 3H(2)O at the various ionic strengths[J]. HYDROMETALLURGY,2012,117(0):36-46. |
| APA | Gao, Wencheng,&Li, Zhibao.(2012).Solubility and K-SP of Mg4Al2(OH)(14)center dot 3H(2)O at the various ionic strengths.HYDROMETALLURGY,117(0),36-46. |
| MLA | Gao, Wencheng,et al."Solubility and K-SP of Mg4Al2(OH)(14)center dot 3H(2)O at the various ionic strengths".HYDROMETALLURGY 117.0(2012):36-46. |
入库方式： OAI收割
来源：过程工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。