Study on arsenic/lead adsorption characteristics by mineral oxides in coal-fired flue gas

YU Sheng-hui; ZHANG Cheng; YUAN Chang-le; MA Lun; FANG Qing-yan; CHEN Gang

Volume 48 Issue 11

Nov. 2020

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Article Navigation > Journal of Fuel Chemistry and Technology > 2020 > 48(11): 1345-1355

YU Sheng-hui, ZHANG Cheng, YUAN Chang-le, MA Lun, FANG Qing-yan, CHEN Gang. Study on arsenic/lead adsorption characteristics by mineral oxides in coal-fired flue gas[J]. Journal of Fuel Chemistry and Technology, 2020, 48(11): 1345-1355.

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YU Sheng-hui, ZHANG Cheng, YUAN Chang-le, MA Lun, FANG Qing-yan, CHEN Gang. Study on arsenic/lead adsorption characteristics by mineral oxides in coal-fired flue gas[J]. Journal of Fuel Chemistry and Technology, 2020, 48(11): 1345-1355.

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Study on arsenic/lead adsorption characteristics by mineral oxides in coal-fired flue gas

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

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National Key Research and Development Programme of China 2018YFB0605105

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Corresponding author: ZHANG Cheng, Tel:027-87542417-8321, Fax:027-87545526, E-mail:chengzhang@mail.hust.edu.cn
Received Date: 2020-09-01
Rev Recd Date: 2020-09-09

Available Online: 2021-01-23

Publish Date: 2020-11-10

Abstract

Abstract

The As₂O₃ or PbO adsorption characteristics using typical mineral oxides as the sorbents were studied in a two-stage fixed-bed reactor under a simulated flue gas, and the density of atomic states, adsorption sites, and adsorption energy for the adsorption reaction were calculated by density functional theory (DFT). The results demonstrate that CaO has a large As₂O₃ adsorption capacity, with an arsenic adsorption capacity of 5.25 mg/g at 900 ℃, followed by Fe₂O₃, MgO, and Al₂O₃; and the adsorbed arsenic exists in the form of As³⁺ and As⁵⁺ arsenates. Kaolin and fly ash have large PbO adsorption capacities, with the maximum lead adsorption capacities of 6.69 and 2.75 mg/g, respectively, followed by SiO₂ and Al₂O₃, and the adsorption capacity for lead with the 50%SiO₂/50%Al₂O₃ mixture is higher than that with their single oxide. The oxygen atoms on the surface of the sorbents are the active sites for As₂O₃ and the unsaturated Si and Al atoms exposed on the surface of the sorbents are the active sites for PbO. In addition, the adsorption temperature and flue gas atmosphere have significant effects on the adsorption capacity and adsorption products of the sorbents.
- heavy metal,
- coal combustion,
- adsorption mechanism,
- oxide sorbents

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References(34)

References

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