一步氨法净化铝电解烟气中氟盐的分离和转化
Separation and conversion of fluoride salts in aluminum electrolysis flue gas by one-step ammonia purification
李雪珂 1刘燕 1李小龙 1张廷安1
作者信息
- 1. Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education,School of Metallurgy,Northeastern University,Shenyang 110819,China
- 折叠
摘要
铝电解烟气中含有氟化物、二氧化硫和二氧化碳等多种污染物,对环境和人类都有危害.目前,对于铝电解烟气净化技术的研究未涉及碳资源的回收,为了解决这个问题,本文提出了一种铝电解烟气一步净化技术.它是一种实现氟化物、SO2和CO2的净化并将废气污染物转化为冰晶石和复合氨肥资源转化的技术,将铝电解烟气经一步氨法净化后的含氟化铵吸收液,通过加入氢氧化钠和氢氧化铝进行化学沉淀生成冰晶石.通过使用氟离子电极、XRD和SEM等分析和检测,获得了最佳操作参数:温度为70℃、搅拌速度为400 r/min、反应物浓度为0.5 mol/L、αk(NaOH与Al(OH)3的分子比)为3.1.
Abstract
The presence of multiple pollutants such as fluoride, SO2, and CO2 in aluminum electrolysis flue gas is harmful to the environment and human beings. The current research on aluminum electrolysis flue gas purification does not involve recovering carbon resources. We propose a one-step purification technology for aluminum electrolysis flue gas purification to address this problem. It is a resource conversion technology that integrates the purification of fluoride, SO2, and CO2 and converts the exhaust pollutants into cryolite and compound ammonia fertilizer. This paper studies an ammonium fluoride-containing absorption solution after one-step ammonia purification of aluminum electrolysis flue gas. It generates cryolites by adding NaOH and Al(OH)3 for chemical precipitation. The optimal operating parameters were obtained by using a fluoride ion electrode, XRD and SEM analysis and detection, under the condition of temperature of 70 ℃, stirring speed of 400 r/min, reactant concentration of 0.5 mol/L, and αk (molecular ratio of NaOH to Al(OH)3) of 3.1.
关键词
铝电解烟气/冰晶石/氟化铵/一步氨法/氟盐的转化Key words
aluminum electrolysis flue gas/cryolite/ammonium fluoride/one-step ammonia method/the conversion of fluoride salt引用本文复制引用
基金项目
National Key Technology R&D Program of China(2017YFC0210404)
National Key Technology R&D Program of China(2017YFC0210403)
National Natural Science Foundation of China(U1760120)
National Natural Science Foundation of China(51504059)
出版年
2023
NETL
NSTL
维普
万方数据