离子型稀土冶炼废水资源回收及达标排放处理工艺研究
Technology analysis for resource recycles and standardized discharge of ion-absorbed rare earth mineral wastewater
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摘要: 离子型稀土冶炼废水水质成分复杂,NH3-N浓度极高,直接排放不仅造成严重的环境污染而且形成巨大的资源浪费。通过全面分析稀土冶炼废水水质,对稀土冶炼废水资源回收及达标排放处理进行了工艺理论分析,并提出了整套工艺流程。实验室小试及中试研究结果显示,该工艺能有效地从稀土冶炼废水中回收农业级NH4Cl,并使废水达到污水综合排放标准(GB 8978-1996)的要求。Abstract: The components are very complex and NH3-N concentration is very high in ionabsorbed rare earth smelt wastewater. The serious environmental pollution and resource wasting would be caused if the wastewater is discharged directly. The characteristics of ion-absorbed rareearth smelting wastewater are analyzed detailed and process and technology of rareearth smelting wastewater treatment are discussed in this paper. The flow chart of process for ion-absorbed rareearth smelting wastewater treatment resource recycles is designed. The results of laboratory and pilotscale experiments showed that the NH4Cl products could be obtained, which can be used in agriculture. The effluent achieves the discharge standard of GB 8978-1996.
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Key words:
- ion-absorbed rare earth /
- wastewater /
- resource recycle /
- ammonium chloride
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