|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||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, Kaihui Cui
|On-Site Speaker (Planned)
In this paper, a method is determined, removing arsenic from waste acid by adding Fe and CuSO4. Through orthogonal experiment, further analyzing the effect of different factors on the removal rate of arsenic in this method. L16(44) orthogonal experiments were employed to optimize the process parameters such as temperature, the reaction time, pH, the molar ratio of Fe/As. Based on the results of the orthogonal experiment, the optimum experimental condition were that: pH was 8, temperature was 80 ℃, the reaction time was 30 minutes 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 micro battery is formed by adding CuSO4 to accelerate the corrosion of Fe powder, which could indirectly increase the efficiency of arsenic removal. From the above, the Cu-Fe micro battery and the adsorption process are very important to arsenic removal, which have close connection with the reaction time and pH. It is consistent with range analysis of orthogonal experiment.