Novel process of NH3-N removal and recovery in rare earth and non-ferrous industry wastewater: Fundamental, simulation and commercial projects
文献类型：会议论文
| 作者 | Lin, Xiao2; Cao, Hongbin2; Liu, Chenming2; Li, Xingang1; Wang, Bo3 |
| 出版日期 | 1905-07-08 |
| 会议日期 | September 11, 2016 - September 15, 2016 |
| 会议地点 | Quebec City, QC, Canada |
| 关键词 | Nitrogen - Costs - Nitrogen removal - Effluents - Water quality - Distillation - Extraction - Rare earths - Recovery - Wastewater treatment - Heavy metals |
| 卷号 | 2016-September |
| 英文摘要 | Over 2 million tons of NH3-N were discharged in China per year recently, rare earth industry contributed 7.03% of NH3-N pollutant from industrial wastewater in 2007. Wastewater containing NH3-N and heavy metals mainly produced in RE extraction saponificated with ammonia and precipitated by ammonia bicarbonate. Generally, 1 ton REO cost 0.6-1.2 ton ammonia for extraction and 1.6 ton ammonia bicarbonate for precipitation, and produce 35-100 ton wastewater. Processes, like Na-saponificated, Ca-saponificated and Non-saponificated technique, are widely studied to reduce the adverse environmental effect of RE industry, while traditional processes still have advantage in production cost, process stability and product quality. In this study, a novel process that combines distillation and air-stripping is developed. NH3-N is removed and recovered based on relative volatility difference of NH3 and H2O. Phase equilibrium, heat equilibrium are calculated to determine process parameters. Hydrodynamic performance like flow field distribution is also simulated. Then, design parameters for distillation trays or structured packing are determined based on calculations and simulations. Besides, the phase diagram of (NH4)2SO4-NH4Cl-H2O in 30掳C - 100掳C, the typical salts composition of nonferrous wastewater, is studied to ensure commercial plants鈥?continuous operation. Ammonia removal tower (ART) with different high efficient column internals is designed to fit RE wastewater treatment requirement. The novel process has been commercialized in RE industry in Jiangxi, China. The commercial project operation results show the novel process reached a nearly zero-emission with >99.5% NH3-N was removed and then recovered as ammonia. Combined the novel process, the traditional REO separation process using ammonia and ammonia bicarbonate could achieve NH3-N reuse and the effluent quality meets the discharge standards. 漏 2017 TAPPI Press. All rights reserved. |
| 资助机构 | Canadian Institute of Mining, Metallurgy and Petroleum |
| 会议录 | 28th International Mineral Processing Congress, IMPC 2016
 |
| 学科主题 | Ammonia |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/59349]  |
| 作者单位 | 1.Tianjin University, 92 Weijin Road, Nankai District, Tianjin; 300072, China 2.Institute of Process Engineering, Chinese Academy of Sciences National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, P.O. Box 353, Beijing; 100190, China 3.Institute of Sino-Sci, Columbus A-1607, 18 Zhongguancun Road,, Haidian District, Beijing; 100080, China |
| 推荐引用方式 GB/T 7714 | Lin, Xiao,Cao, Hongbin,Liu, Chenming,et al. Novel process of NH3-N removal and recovery in rare earth and non-ferrous industry wastewater: Fundamental, simulation and commercial projects[C]. 见:. Quebec City, QC, Canada. September 11, 2016 - September 15, 2016. |
入库方式： OAI收割
来源：过程工程研究所
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