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| 木质素磺酸钙强化微生物加固酸化尾砂的作用机理 |
| Mechanism of calcium lignosulfonate strengthening MICP to reinforce acidified tailings |
| 投稿时间：2025-04-21 修订日期：2025-05-12 |
| DOI： |
| 中文关键词: 木质素磺酸钙 MICP 酸化尾矿砂 固化效果 微观结构 |
| 英文关键词:calcium lignosulfonate MICP acidified tailings curing effect microstructure |
| 基金项目:湖南省自然科学基金资助项目(2023JJ30511),湖南省教育厅重点科研项目(18A252) |
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| 中文摘要: |
| 摘要:针对铅锌尾矿结构松散、尾矿砂酸化后力学性能下降的问题。综合木质素磺酸钙特性与微生物作用环境，通过变量控制木质素磺酸钙掺量，开展MICP(微生物诱导碳酸钙沉淀) 改性酸化尾矿砂的宏观力学与微观表征实验，分析木质素磺酸钙对微生物固化后酸化尾矿砂的宏观力学参数及微观形貌特征。结果表明：（1）木质素磺酸钙可有效促进酸化尾矿砂微生物诱导碳酸钙沉淀过程中胶结物的生成效率，当木质素磺酸钙添加为1%时，胶结物生成量达峰值，对比单一MICP作用提升20.24%。（2）MICP引入木质素磺酸钙固化酸化尾矿砂后的抗剪强度和抗压强度得到增强，0.5%～2%掺量下尾矿砂的抗压强度提升37.87%～62.01%，抗剪强度提升了7.67%～23.11%。（3）木质素磺酸钙的掺入通过补充钙源及强化微生物固定效率，共同促进MICP反应，优化碳酸钙沉淀颗粒尺寸、性状、排列方式，进而增加胶结物含量，从而显著提升酸化尾矿砂的固化效果。
关键词：木质素磺酸钙；MICP；酸化尾矿砂；固化效果；微观结构 |
| 英文摘要: |
| Abstract: In this paper, the loose structure of lead and zinc tailings and the decrease of mechanical properties after acidification of tailings were discussed. Based on the characteristics of calcium lignosulfonate and the microbial environment, the macro-mechanical and micro-characterization experiments of MICP (Microbially Induced Calcite Precipitation) modified acidified tailings were carried out by controlling the amount of calcium lignosulfonate. The macro-mechanical parameters and micro-structural characteristics of acidified tailings after microbial curing were analyzed. The results showed that:(1) Calcium lignosulfonate can effectively promote the formation efficiency of cementation in the process of microbial induced calcium carbonate precipitation in acidified tailings. When calcium lignosulfonate is added to 1%, the formation amount of cementation reaches the peak, which is 20.24% higher than that of single MICP.(2) The shear strength and compressive strength of the tailings after the introduction of calcium lignosulfonate curing acid were enhanced, and the compressive strength of the tailings increased by 37.87%~62.01% and the shear strength increased by 7.67%~23.12% at the dosage of 0.5%~2%.(3) The addition of calcium lignosulfonate can promote the MICP reaction by supplementing calcium sources and strengthening the microbial fixation efficiency, optimize the particle size, properties and arrangement mode of calcium carbonate precipitate, and then increase the content of cementation, so as to significantly improve the solidification effect of acidified tailings.
Keyword: calcium lignosulfonate; MICP; acidified tailings; curing effect; microstructure |
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