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| Removal of As(III) from high-arsenic fouling acids by monoclinic FeS |
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Received:April 10, 2024
Revised:December 11, 2024
Accepted:April 02, 2025
Published Online:August 05, 2025
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| DOI： |
| KeyWord:high-arsenic fouling acid; monoclinic FeS; sulfidation method; slow-release arsenic removal; sulfurizing agent |
| Author | Institution |
| Qingfeng Dong |
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology |
| Baoxin Liu |
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology |
| Mengmeng Zhang |
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology |
| Jing Li |
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology |
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| Abstract: |
| Non-ferrous smelting enterprises in the metal smelting process will produce a large number of smelting flue gas containing SO2, in order to realize the resource utilization of smelting flue gas, through the double-conversion double-absorption sulfuric acid production process will be used for the production of sulfuric acid smelting flue gas. In this process, a large amount of acidity, high arsenic content and complex impurities are generated. Sulfide method is widely used in the treatment of high arsenic dirty acid because of its high arsenic removal rate and low slag quantity. At present, Na2S and NaHS are often selected as sulfide chemicals in the sulfide arsenic removal stage, and the use of such sulfide chemicals introduces difficult-to-treat sodium ions into the system, and their high solubility coefficients need to be further adapted to the actual rate of arsenic removal in order to reduce the pressure on environmental protection. In this study, a process for removing arsenic from dirty acid using monoclinic crystal FeS was proposed using the dirty acid generated during the production process of a nonferrous smelter in Yunnan. Monoclinic FeS was prepared by high-temperature synthesis, and its large specific surface area, poor stability of the crystal structure, and easy to dissolve in the contaminated acid were utilized to provide S2- stably for the arsenic removal reaction, to reduce the risk of H2S gas escape, and to reduce the pressure of environmental protection. Under the conditions of S/As molar ratio of 3.75 and reaction temperature of 40 ℃ for 180 min, the arsenic concentration was reduced from 1889 mg·L-1 to 1.54 mg·L-1, which meets the technical requirements of the sulfidation treatment process of high-arsenic contaminated acid in non-ferrous smelting enterprises. The monoclinic FeS and arsenic removal reaction products were characterized by XRF, XRD, XPS, SEM and other analytical methods. The surface of monoclinic FeS consisted of a large number of needle-like particles, which were used for a large specific surface area, and As(Ⅲ) in the fouling acid was removed in the form of As2S3, which went into the precipitates together with the incompletely reacted monoclinic FeS at the end of the reaction. |
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