| 酸性废水体系中硫酸钙反应结晶过程研究(英文) |
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| 引用本文： | 邓立聪,张亦飞,陈芳芳,曹绍涛,游韶玮,刘艳,张懿.酸性废水体系中硫酸钙反应结晶过程研究(英文)[J].中国化学工程学报,2013,21(11):1303-1312. |
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| 作者姓名： | 邓立聪 张亦飞 陈芳芳 曹绍涛 游韶玮 刘艳 张懿 |
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| 作者单位： | 1.Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| 基金项目： | Supported by the National High Technology Research and Development Program of China(2011AA060701);the National Water Pollution Control and Management Science Program of China(2009ZX07529-005) |
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| 摘 要： | The present work focused on the recycle of the sulfate and the metal ions from acidic wastewater dis charged 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 plateletlike and nee dlelike shape to rodlike shape when the temperature was increased from 25 to 70 ℃. An increase in the agglom.
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| 关 键 词： | reactive crystallization acidic wastewater lime milk calcium sulfate dihydrate |
| 收稿时间： | 2012-07-30 |
Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime |
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| DENG Licong;ZHANG Yi.Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime[J].Chinese Journal of Chemical Engineering,2013,21(11):1303-1312. |
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| Authors: | DENG Licong;ZHANG Yi |
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| Affiliation: | 1.Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The 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 ℃. 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. |
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| Keywords: | reactive crystallization acidic wastewater lime rmlk calcium sultate dihayOxate |
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