Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime
文献类型：期刊论文
| 作者 | Deng Licong1,2; Zhang Yifei1; Chen Fangfang1 ; Cao Shaotao1; You Shaowei1,2; Liu Yan1,2; Zhang Yi1
|
| 刊名 | CHINESE JOURNAL OF CHEMICAL ENGINEERING
 |
| 出版日期 | 2013-11-01 |
| 卷号 | 21期号:11页码:1303-1312 |
| 关键词 | reactive crystallization acidic wastewater lime milk calcium sulfate dihydrate |
| 英文摘要 | 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 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. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Engineering, Chemical |
| 研究领域[WOS] | Engineering |
| 关键词[WOS] | HEAVY-METALS ; SPONTANEOUS PRECIPITATION ; HYDROXIDE PRECIPITATION ; CHEMICAL PRECIPITATION ; REVERSE-OSMOSIS ; IONS ; GYPSUM ; GROWTH ; SUPERSATURATION ; WASTEWATERS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000329834700013 |
| 公开日期 | 2015-05-27 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/13540]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：过程工程研究所
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