摘要：
为降低钽铌湿法冶炼过程所产生的废水中的氨氮, 对分类处理钽铌湿法冶炼产生的各种氨氮废水进行了试验研究。结果表明, 对高浓度氨氮(NH4+-N>10000mg/L)废水进行蒸发、冷凝、结晶, 制取的氨水可返回钽铌工业使用;对中浓度氨氮(NH4+-N 500～10 000 mg/L)废水进行吹脱, 吹脱后出水氨质量浓度<100 mg/L;对低浓度氨氮(NH4+-N<500 mg/L)废水进行离子交换法处理, 出水氨氮可满足《城镇污水处理厂综合排放标准》(GB 18918—2002)规定的一级排放标准。这套组合工艺能带来较高的经济效益。
关键词:
钽铌湿法冶炼,
氨氮废水,
综合治理
Abstract:
In order to reduce the concentration of NH4+-N in wastewater brought about in the process of Ta/Nb hydrometallurgy, the sorting operation of various ammonia-nitrogen wastewater brought about in the process of Ta/Nb hydrometallurgy has been studied. Experiments show that the NH3·H2O made from the evaporation, condensation and crystallization of the wastewater with highly concentrated ammonia-nitrogen（NH4+-N＞10 000 mg/L）can be recycled in Ta/Nb metallurgy. After the blow-off of ammonia-nitrogen wastewater with medium concentration（NH4+-N500～10 000 mg/L）, the ammonia concentration is less than 100 mg/L. After the ion exchange treatment of ammonianitrogen wastewater with low concentration （NH4+-N＜500 mg/L）, the effluent NH4+-N can meet the requirements of the First Grade of Comprehensive Discharge Standard of Urban Sewage Treatment （GB 18918—2002）. This combined technology can bring higher economic benefits.
Key words:
tantalum and niobium hydrometallurgy,
wastewater containing ammonia-nitrogen,
comprehensive treatment
中图分类号:
赖兰萍, 汪葵, 周洁英, 陈冬英, 陈后兴. 钽铌湿法冶炼废水中氨氮去除方法的试验研究[J]. 工业水处理, 2011, 31(3): 53-56.
Lai Lanping, Wang Kui, Zhou Jieying, Chen Dongying, Chen Houxing. Experimental study on the removal of ammonia-nitrogen from Ta/Nb hydrometallurgy wastewater[J]. INDUSTRIAL WATER TREATMENT, 2011, 31(3): 53-56.