Optimization of Arsenic Removal Process
in Waste Acid from Zinc Smelting Plant
Based on Orthogonal Experiment
Tianqi Liao, Yongguang Luo, Hongtao Qu, Te Zhang, Jing Li, Yunhao Xi,
Jingtian Zou, Libo Zhang and Kaihui Cui
Abstract In this paper, a method is determined, removing arsenic from waste acid
by adding Fe and CuSO 4 . Through orthogonal experiment, further analyze the effect
of different factors on the removal rate of arsenic in this method. L 16 (4
4 ) orthogonal
experiments were employed to optimize the process parameters such as temperature,
the reaction time, pH, and the molar ratio of Fe/As. Based on the results of the
orthogonal experiment, the optimum experimental conditions were that: pH was 8,
temperature was 80 °C, the reaction time was 30 min, and the molar ratio of Fe/As
was 8. Through range analysis, it was found that the order of significant factors for
the removal rate of arsenic in waste acid is the reaction time > pH > temperature >
the molar ratio of Fe/As. The optimized technological parameter was selected for
verification experiment. Forming iron oxides and hydroxides via Fe powder corroded,
which adopt adsorption coprecipitation mechanism to remove arsenic from waste
acid. Besides that, the most important point is that Cu–Fe battery is formed by adding
CuSO 4 to accelerate the corrosion of Fe powder, which could indirectly increase the
efficiency of arsenic removal. From the above, the Cu–Fe battery and the adsorption
T. Liao · Y. Luo · J. Li (B) · Y. Xi · J. Zou · L. Zhang (B) · K. Cui
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and
Technology, Kunming 650093, Yunnan, China
e-mail: lijingkind@163.com
L. Zhang
e-mail: zhanglibopaper@126.com
T. Liao · J. Li · Y. Xi · J. Zou · L. Zhang · K. Cui
Kunming Key Laboratory of Special Metallurgy, Kunming University of Science and Technology,
Kunming 650093, China
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming
University of Science and Technology, Kunming 650093, Yunnan, China
National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment
Technology, Kunming 650093, Yunnan, China
Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming 650093, China
Y. Luo · H. Qu · T. Zhang
Yunnan Chihong Zn&Ge Co., Ltd., Qujing, Yunnan 655011, China
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_61
707
in Waste Acid from Zinc Smelting Plant
Based on Orthogonal Experiment
Tianqi Liao, Yongguang Luo, Hongtao Qu, Te Zhang, Jing Li, Yunhao Xi,
Jingtian Zou, Libo Zhang and Kaihui Cui
Abstract In this paper, a method is determined, removing arsenic from waste acid
by adding Fe and CuSO 4 . Through orthogonal experiment, further analyze the effect
of different factors on the removal rate of arsenic in this method. L 16 (4
4 ) orthogonal
experiments were employed to optimize the process parameters such as temperature,
the reaction time, pH, and the molar ratio of Fe/As. Based on the results of the
orthogonal experiment, the optimum experimental conditions were that: pH was 8,
temperature was 80 °C, the reaction time was 30 min, and the molar ratio of Fe/As
was 8. Through range analysis, it was found that the order of significant factors for
the removal rate of arsenic in waste acid is the reaction time > pH > temperature >
the molar ratio of Fe/As. The optimized technological parameter was selected for
verification experiment. Forming iron oxides and hydroxides via Fe powder corroded,
which adopt adsorption coprecipitation mechanism to remove arsenic from waste
acid. Besides that, the most important point is that Cu–Fe battery is formed by adding
CuSO 4 to accelerate the corrosion of Fe powder, which could indirectly increase the
efficiency of arsenic removal. From the above, the Cu–Fe battery and the adsorption
T. Liao · Y. Luo · J. Li (B) · Y. Xi · J. Zou · L. Zhang (B) · K. Cui
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and
Technology, Kunming 650093, Yunnan, China
e-mail: lijingkind@163.com
L. Zhang
e-mail: zhanglibopaper@126.com
T. Liao · J. Li · Y. Xi · J. Zou · L. Zhang · K. Cui
Kunming Key Laboratory of Special Metallurgy, Kunming University of Science and Technology,
Kunming 650093, China
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming
University of Science and Technology, Kunming 650093, Yunnan, China
National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment
Technology, Kunming 650093, Yunnan, China
Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming 650093, China
Y. Luo · H. Qu · T. Zhang
Yunnan Chihong Zn&Ge Co., Ltd., Qujing, Yunnan 655011, China
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_61
707