Abstract
Arsenic-containing industrial wastes contain high levels of hazardous arsenic compounds, for which proper pollution control and resource recovery is a high priority and a matter of great urgency. In this study, a process that combines alkaline leaching and acid precipitation was investigated with a view to extracting and recovering arsenic from the sludge-like waste generated during phosphoric acid production, as well as reducing the quantity of the waste to be disposed. The effects of NaOH concentration, liquid-to-solid (L/S) ratio, and extraction time on arsenic leaching were studied. Results indicated that 98.7 % of arsenic could be extracted from the waste when it was leached for 100 min using a NaOH solution of 1.875 mol/L, and a L/S ratio of 8 L/kg. The solid residue accounted for only 5.6 % of the raw waste, suggesting a significant reduction of the quantity requiring safe disposal. Arsenic trioxide was recovered from the alkaline leachate by acid precipitation, at an optimal H2SO4/arsenic ratio of 1.9 mol/mol; after washing with diluted acid, the purity of arsenic trioxide reached 93.4 % and the total recovery ratio of arsenic was 79 %. This relatively simple process was found to be an effective method for arsenic removal and recovery from the sludge-like waste.
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This work was supported by the National High-Tech Research and Development Programs of China (Grant No. 2007AA061300).
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Zhang, H., Yao, Q., Shao, LM. et al. Recovery of Arsenic Trioxide from a Sludge-Like Waste by Alkaline Leaching and Acid Precipitation. Waste Biomass Valor 5, 255–263 (2014). https://doi.org/10.1007/s12649-013-9231-1
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DOI: https://doi.org/10.1007/s12649-013-9231-1