摘要
针对含硫铅锌尾矿造成的环境污染问题,本研究采用微生物诱导碳酸钙沉淀技术,通过巴氏芽孢杆菌与硫酸盐还原菌联合作用进行加固与修复。同时优化复合营养液配方,发现以碳酸氢铵为最佳碳源,且钙源浓度为0.50 mol/L时效果最佳。结果表明,此时复合营养液试样的无侧限抗压强度为1.075 MPa,碳酸钙含量为13.03%(质量分数),相比于相同浓度的基本营养液,分别提高了27.33%和29.21%。同时,对重金属离子与硫酸根离子的固化效果显著,其中Pb^(2+)、总Fe、总Cr、Cd^(2+)、Cu^(2+)、Mn^(2+)被完全去除,Zn^(2+)固化率超过98%,SO_(4)^(2-)固化率最高可达到88.68%。微观分析表明,固化样品形成了高黏结性的文石、方解石等晶体,有效胶结了尾矿颗粒。本研究为含硫铅锌尾矿的固化与修复提供了一种新方法。
In order to slove the environmental pollution problem caused by sulfur-containing lead-zinc tailings,this study adopted microbial induced calcuim carbonate precipitation technology to solidify and remediate the tailings through the synergistic action of S.pasteurii and sulfate-reducing bacteria.By simultaneously optimizing the formula of the composite nutrient solution,it is found that ammonium bicarbonate is the optimal carbon source,and the best results achieve when the calcium source concentration is 0.50 mol/L.The results show that the unconfined compressive strength of the composite nutrient solution specimen is 1.075 MPa and the calcium carbonate content is 13.03%.Compared with the basic nutrient solution of the same concentration,unconfined compressive strength and calcium carbonate content have increased by 27.33%and 29.21%,respectively.Additionally,the curing effect of heavy metal ions and sulfate ions is remarkable,with Pb^(2+),total Fe,total Cr,Cd^(2+),Cu^(2+),and Mn^(2+)being completely removed,the curing rate of Zn^(2+)exceeding 98%,and the curing rate of SO^(2-)_(4)is up to 88.68%.Microscopic analysis reveals that the solidified samples formed highly cohesive crystals such as aragonite and calcite,effectively binding the tailings particles together.This study offers a novel approach for the solidification and remediation of sulfur-containing lead-zinc tailings.
作者
谷庆
狄军贞
GU Qing;DI Junzhen(College of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《硅酸盐通报》
北大核心
2025年第5期1742-1754,共13页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(41672247)
辽宁省“兴辽英才”青年拔尖人才计划支持(XLYC1807159)
校“双一流”创新团队(LNTU20TD-21)。
关键词
微生物诱导碳酸钙沉淀
含硫铅锌尾矿
复合营养液
巴氏芽孢杆菌
硫酸盐还原菌
microbial induced calcium carbonate precipitation
sulfur-containing lead-zinc tailing
composite nutrient solution
S.pasteurii
sulfate-reducing bacteria
