Simulation and Optimization
of Defluorination and Desulfurization
Processes of Aluminum Electrolysis Flue
Gas
Xueke Li, Yan Liu, Xiaolong Li, and Tingan Zhang
Abstract Aiming at the harmful gas pollutants of low concentration sulfur dioxide
and fluoride in electrolytic aluminum flue gas, the process of fluorine and sulfur
removal was simulated by NaOH-CO 2 gas–liquid absorption system, and the influence of operation and structure parameters such as gas flow rate, liquid flow rate,
size, and type of filler on gas-liquid mass transfer process was explored. The results
show that the gas flow rate is 1.5–2.0 m
3 /h, the liquid flow rate is 10–12 m
3 /h, and
the filler is a Bauer ring with the nominal diameter (DN) of 16 mm, the gas–liquid
mass transfer effect is the best and the maximum CO 2 utilization rate is about 46%.
According to the simulation results, when ammonia system is used to absorb sulfur
dioxide and hydrogen fluoride, the concentration of sulfur dioxide and hydrogen
fluoride can be reduced to 42 mg/m
3 and 0.8 mg/ m
3 , respectively.
Keywords Mass transfer process simulation · Defluorination; desulfurization ·
Absorption rate · Aluminum electrolysis flue gas
Introduction
Chinese aluminum production is developing rapidly in the world’s aluminum production, especially in the production capacity of electrolytic aluminum. Aluminum electrolysis flue gas contains harmful substances such as sulfur dioxide and fluoride,
which has serious harm to the human body and environment. Therefore, the deep
X. Li · Y. Liu (B) · X. Li · T. Zhang
Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry,
School of Metallurgy, Northeastern University, Shenyang 110819, China
e-mail: liuyan@smm.neu.edu.cn
X. Li
e-mail: 675900795@qq.com
X. Li
e-mail: lixiaolong1992vip@163.com
T. Zhang
e-mail: zta2000@163.net
© The Minerals, Metals & Materials Society 2021
A. A. Baba et al. (eds.), Energy Technology 2021, The Minerals, Metals
& Materials Series, https://doi.org/10.1007/978-3-030-65257-9_12
123
of Defluorination and Desulfurization
Processes of Aluminum Electrolysis Flue
Gas
Xueke Li, Yan Liu, Xiaolong Li, and Tingan Zhang
Abstract Aiming at the harmful gas pollutants of low concentration sulfur dioxide
and fluoride in electrolytic aluminum flue gas, the process of fluorine and sulfur
removal was simulated by NaOH-CO 2 gas–liquid absorption system, and the influence of operation and structure parameters such as gas flow rate, liquid flow rate,
size, and type of filler on gas-liquid mass transfer process was explored. The results
show that the gas flow rate is 1.5–2.0 m
3 /h, the liquid flow rate is 10–12 m
3 /h, and
the filler is a Bauer ring with the nominal diameter (DN) of 16 mm, the gas–liquid
mass transfer effect is the best and the maximum CO 2 utilization rate is about 46%.
According to the simulation results, when ammonia system is used to absorb sulfur
dioxide and hydrogen fluoride, the concentration of sulfur dioxide and hydrogen
fluoride can be reduced to 42 mg/m
3 and 0.8 mg/ m
3 , respectively.
Keywords Mass transfer process simulation · Defluorination; desulfurization ·
Absorption rate · Aluminum electrolysis flue gas
Introduction
Chinese aluminum production is developing rapidly in the world’s aluminum production, especially in the production capacity of electrolytic aluminum. Aluminum electrolysis flue gas contains harmful substances such as sulfur dioxide and fluoride,
which has serious harm to the human body and environment. Therefore, the deep
X. Li · Y. Liu (B) · X. Li · T. Zhang
Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry,
School of Metallurgy, Northeastern University, Shenyang 110819, China
e-mail: liuyan@smm.neu.edu.cn
X. Li
e-mail: 675900795@qq.com
X. Li
e-mail: lixiaolong1992vip@163.com
T. Zhang
e-mail: zta2000@163.net
© The Minerals, Metals & Materials Society 2021
A. A. Baba et al. (eds.), Energy Technology 2021, The Minerals, Metals
& Materials Series, https://doi.org/10.1007/978-3-030-65257-9_12
123