APT结晶与煅烧过程中氨回收与循环利用  

Ammonia Recovery and Recycling during APT Crystallization and Calcination Process

作　　者：李军 丁伟 张秋江 Li Jun;Ding Wei;Zhang Qiujiang(Hunan Shizhuyuan Nonferrous Metals Co.,Ltd.,Chenzhou Hunan 423037,China)

机构地区：[1]湖南柿竹园有色金属有限责任公司,湖南郴州423037

出　　处：《硬质合金》2023年第6期474-478,共5页Cemented Carbides

摘　　要：以钨湿法冶炼中的酸性萃取工艺治理含氨尾气为例,阐述了含氨废气的产生来源以及特征,研究了氨回收的基本机理。在此基础上,结合生产实践分类处置,提出了结晶尾气(精馏提浓+加压低温水吸收)和煅烧尾气(除尘+加压低温水吸收)等单项技术,形成钨冶炼含氨气、水的全生产流程高效闭路循环利用治理新方案,跟踪了实施效果。通过新治理方案的实施,实现了液氨消耗降低66.7%,氨回收利用效率由低于50%提高至98%以上,从源头减少气态氨污染因子的排放,产生显著的经济和环保效益,为钨冶炼的绿色减排提供参考。Taking the treatment of ammonia waste gas in the acid extraction process of tungsten hydrometallurgy as an example,this thesis describes the sources and characteristics of ammonia waste gas and studies the basic mechanism of ammonia recovery.On this basis,according to the classified disposal during actual production,technologies such as(distillation and concentration+pressurized low-temperature water absorption)for ammonia waste gas from evaporative crystallization and(dust removal+pressurized low-temperature water absorption)for ammonia waste gas from calcination are proposed,forming a new method of efficient closed-circuit recycling treatment of ammonia waste gas and water in the whole process of tungsten smelting.The implementation effect is also tracked.Through the implementation of the new treatment method,the consumption of liquid ammonia is lowered by 66.7%;the efficiency of ammonia recovery is increased from less than 50%to more than 98%,and the emission of gaseous ammonia-contaminated factor is reduced from the source,producing significant economic and environmental benefits and providing a reference for environmental protection and emission reduction of tungsten smelting.

关 键 词：酸性萃取 钨 氨回收 氨水 绿色减排 

分 类 号：TF841.1[冶金工程—有色金属冶金]