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| 木质素磺酸钙改良红黏土强化氡气阻滞性能及微观机理 |
| Performance Enhancement for Radon Reduction of Red Clay and Its Micro-mechanism Improved by Calcium Lignosulfonate |
| 投稿时间：2025-04-25 修订日期：2025-05-13 |
| DOI： |
| 中文关键词: 铀尾矿库 木质素磺酸钙 土体改良 氡析出 |
| 英文关键词:uranium mill tailings impoundment calcium lignosulfonate soil improvement radon exhalation |
| 基金项目:湖南省自然科学基金面上项目(2023JJ30495),木质素磺酸钙改良红黏土强化氡气阻滞机理及效果研究；湖南省研究生科研创新项目(CX20220979),土壤淋滤作用下低掺量木质素改良红黏土氡气阻滞效果研究；湖南省大学生创新训练计划项目(S202310555014),EICP-CaLS改良红黏土工艺参数优化研究。 |
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| 中文摘要: |
| 本文以我国湖南某铀尾矿库周边红黏土为研究对象，以木质素磺酸钙和铀尾矿分别为改良剂和氡源，开展不同掺量（0%、1%、3%、6%、8%）和养护龄期（0d、3d、7d、14d、28d）条件下木质素磺酸钙改良红黏土覆盖降氡实验，结合降氡率评价改良土氡气阻滞性能，并基于SEM、XRD方法对其改良机理进行微观分析。结果表明：3%掺量、养护28d的改良土氡气阻滞效果最佳，达到92.7%。改良后的土壤结构更加稳定密实，颗粒较大，孔隙较小且数量相对较少；木质素磺酸钙改良土是一种物理胶结作用，具体表现为包裹土颗粒形成胶状薄膜并连接相邻颗粒，将独立的小颗粒聚集成较大的颗粒，使土壤孔隙率降低，弱化氡的扩散运移能力。 |
| 英文摘要: |
| This paper takes the red clay around a uranium mill tailings impoundment in Hunan, China as the research object，uses calcium lignosulfonate and uranium mill tailings as modifier and radon source，carries out radon-reduction experiments on red clay improved with calcium lignosulfonate at different dosages (0%, 1%, 3%, 6%, 8%) and curing ages (0d, 3d, 7d, 14d, 28d)，uses radon reduction rate to evaluate performance enhancement for radon reduction of red clay before and after improvement，and conducts microscopic analysis of its improvement mechanism based on SEM and XRD method. Results show that improved soil with 3% calcium lignosulfonate and 28 days curing had the best radon reduction performance, with a radon reduction rate of 92.7%. Structure of improved soil is more stable and compact, with larger particles, smaller pores, and relatively fewer quantities. The reason is that calcium lignosulfonate-improved soil achieves its improvement through a physical cementation mechanism. Specifically, calcium lignosulfonate wraps around soil particles to form a gelatinous film and connects adjacent particles, aggregating independent small particles into larger ones, reducing the porosity of the soil and the diffusion and migration of radon. |
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