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http://dx.doi.org/10.7844/kirr.2021.30.4.11

Behavior of Oxidative Precipitation of High-Arsenic (III) Solution Utilizing Activated Carbon with Air Injection  

Kim, Rina (Resources Recovery Research Center, Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kim, Gahee (DMR Convergence Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kim, Kwanho (DMR Convergence Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
You, Kwang-suk (DMR Convergence Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Resources Recycling / v.30, no.4, 2021 , pp. 11-19 More about this Journal
Abstract
Arsenic (As) oxidation followed by precipitation from a high-As(III)-containing leaching solution derived from a sulfidic ore was investigated in this study to remove aqueous As from the solution using activated carbon (AC) with air injection as an oxidant. To obtain the initial leaching solution, a domestic sulfidic ore was leached in a sulfuric acid solution at pH 1 and 50℃ for 95 h, and approximately 7 g/L of Fe and 3 g/L of As were leached out. To determine the effect of the oxidative reaction utilizing AC with air injection, the leaching solution was tested under the following five oxidative conditions at an initial pH of 1 and 90℃ for 72 h: air-only injection; air injection with 1, 5, and 10 w/v% of AC addition; and H2O2 addition. The tests in the presence of both air and AC revealed that the oxidation kinetics and As removal were improved by the reaction between the metallic species and the surface group formed on the AC surface. In addition, the greater the amount of AC added, the better was the reaction efficiency, removing 93-94% of As with more than 5 w/v% of AC addition. Finally, X-ray diffraction analysis confirmed that the precipitate formed from the oxidative reaction was scorodite (FeAsO4·2H2O).
Keywords
Arsenic removal; scorodite; oxidation; sulfide mineral; activated carbon;
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