基于单纯形重心设计法的含砷废渣稳定剂设计与开发

余志元; 李二平; 杨厅; 戴欣

doi:10.13205/j.hjgc.202305012

基于单纯形重心设计法的含砷废渣稳定剂设计与开发

doi: 10.13205/j.hjgc.202305012

余志元¹,
李二平^1, ,,
杨厅²,
戴欣¹

1. 湖南省环境保护科学研究院水污染控制技术湖南省重点实验室, 长沙 410042;
2. 江西铜业技术研究院有限公司冶化研究所, 南昌 330096

基金项目:

湖南省环保科研课题(湘财预[2020]001号)

湖南省高新技术产业科技创新引领计划(2021GK4056)

详细信息

作者简介:
余志元(1987-),男,博士,副研究员,主要研究方向为固体废物资源化。csuyzy@126.com

通讯作者:
李二平(1980-),男,博士,研究员,主要研究方向为固体废物资源化技术研发和环境管理。717565881@qq.com

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出版历程
- 收稿日期: 2022-06-13

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

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

摘要

摘要: 以FeSO₄·H₂O、零价铁(ZVI)和二氧化锰(MnO₂)为原料,采用单纯形重心设计法(SCMD)对混合料配比进行建模和优化,设计开发出一种新型复合铁基稳定剂,并应用于含砷废渣的稳定。结果表明:以质量分数为65.05% FeSO₄·H₂O、10.00% ZVI和24.95% MnO₂混料制备的复合铁基稳定剂可实现最低成本的As长效稳定化。利用25%新型复合铁基稳定剂处理砷钙渣(ACR),可使As浸出浓度从162 mg/L降至0.645 mg/L,低于GB 18598—2019《污染废物填埋控制标准》规定的上限(1.2 mg/L)。采用SEM-EDS、FTIR和XPS方法研究了ACR中As的稳定机理,即有效态As通过Fe/Mn(氢化物)氧化物和Fe(Ⅲ)的吸附、络合和沉淀,形成稳定的非晶态Fe/Mn-As,复合铁基稳定剂结合H₂SO₄通过"释放-氧化-稳定"的过程获得优异的As稳定性能。该研究结果可为多组分复合稳定剂的设计和实现含砷固体废物的有效稳定提供理论依据。
- 含砷废渣 /
- 混料设计 /
- 稳定剂 /
- 长效稳定性
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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参考文献(18)

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