DESIGN AND DEVELOPMENT OF A STABILIZER FOR ARSENIC-CONTAINING RESIDUE BASED ON SIMPLEX-CENTROID DESIGN METHOD

YU Zhiyuan; LI Erping; YANG Ting; DAI Xin

doi:10.13205/j.hjgc.202305012

Volume 41 Issue 5

May 2023

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YU Zhiyuan, LI Erping, YANG Ting, DAI Xin. DESIGN AND DEVELOPMENT OF A STABILIZER FOR ARSENIC-CONTAINING RESIDUE BASED ON SIMPLEX-CENTROID DESIGN METHOD[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 84-91. doi: 10.13205/j.hjgc.202305012

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YU Zhiyuan, LI Erping, YANG Ting, DAI Xin. DESIGN AND DEVELOPMENT OF A STABILIZER FOR ARSENIC-CONTAINING RESIDUE BASED ON SIMPLEX-CENTROID DESIGN METHOD[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 84-91. doi: 10.13205/j.hjgc.202305012

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DESIGN AND DEVELOPMENT OF A STABILIZER FOR ARSENIC-CONTAINING RESIDUE BASED ON SIMPLEX-CENTROID DESIGN METHOD

doi: 10.13205/j.hjgc.202305012

1. Hunan Provincial Key Laboratory of Water Pollution Control Technology, Hunan Research Academy of Environmental Science, Changsha 410042, China;
2. Jiangxi Copper Technology Institute Co., Ltd, Research Institute of Chemical Metallurgy, Nanchang 330096, China

Received Date: 2022-06-13

Abstract

Abstract

In this study, the simplex-centroid design method (SCMD) was used to model and optimize the mixing ratio of FeSO₄·H₂O zero-valent iron (ZVI) and manganese dioxide (MnO₂) as the raw materials, and a new composite Fe-based stabilizer was designed and developed, and then applied to the stabilization of arsenic-containing residue. The results showed that the optimum combination for high As stabilization performance and low cost of stabilizer was the mixture of 65.05, 10.00 and 24.95 % FeSO₄·H₂O, ZVI and MnO₂. The leaching concentration of As decreased from 162 mg/L to 0.645 mg/L, lower than the limit value(1.2 mg/L) prescribed in China. The stability mechanism of As in ACR was studied by SEM-EDS, FTIR and XPS, while the available As was stabilized by adsorption, complexation and precipitation of Fe/Mn (hydride) oxide and Fe(Ⅲ), forming stable amorphous Fe/Mn-As. The composite Fe-based stabilizer combined with H₂SO₄ obtained excellent stability of As through a process of release-oxidation-stabilization. This study provides an sound theoretical basis for design of multi-component composite stabilizers and effective stabilization of arsenic-containing residue.
- arsenic-containing residue,
- mixture design,
- stabilizer,
- long-term stability

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References(18)

References

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