生物辅助提高金尾矿抗剪强度和压缩性

IF 2.2 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Geomicrobiology Journal Pub Date : 2023-02-16 DOI:10.1080/01490451.2023.2176574

H. Behzadipour, A. Sadrekarimi

{"title":"生物辅助提高金尾矿抗剪强度和压缩性","authors":"H. Behzadipour, A. Sadrekarimi","doi":"10.1080/01490451.2023.2176574","DOIUrl":null,"url":null,"abstract":"Abstract Safe storage of mine tailings has challenged engineers as shown by numerous historical tailings dam failures. While the storing of tailings behind tailings dams is the most practical containment solution, poor mechanical characteristics (low strength and high compressibility) of these waste materials raises serious concerns regarding the stability of tailings dams. In this study, the microbially-induced calcite precipitation (MICP) technique is used to treat gold tailings. Accordingly, tailings were enriched with Sporosarcina pasteurii and flushed with different concentrations of cementation solution to find the CaCl2 amount that produces the highest shear strength in studied tailings. Their shear strength and compressibility were measured in direct shear and one-dimensional oedometer tests and compared with those of the untreated tailings. Results showed that the 50 mM CaCl2 cementation solution proved the most effective treatment solution with respect to MICP, reducing compressibility of tailings by about 300% when loaded up to 800 kPa and improving shear strength by 140%. X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope (SEM) images of treated samples further illustrated the effects of MICP on the composition and structure of the tailings specimens.","PeriodicalId":12647,"journal":{"name":"Geomicrobiology Journal","volume":"40 1","pages":"360 - 371"},"PeriodicalIF":2.2000,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Bio-Assisted Improvement of Shear Strength and Compressibility of Gold Tailings\",\"authors\":\"H. Behzadipour, A. Sadrekarimi\",\"doi\":\"10.1080/01490451.2023.2176574\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract Safe storage of mine tailings has challenged engineers as shown by numerous historical tailings dam failures. While the storing of tailings behind tailings dams is the most practical containment solution, poor mechanical characteristics (low strength and high compressibility) of these waste materials raises serious concerns regarding the stability of tailings dams. In this study, the microbially-induced calcite precipitation (MICP) technique is used to treat gold tailings. Accordingly, tailings were enriched with Sporosarcina pasteurii and flushed with different concentrations of cementation solution to find the CaCl2 amount that produces the highest shear strength in studied tailings. Their shear strength and compressibility were measured in direct shear and one-dimensional oedometer tests and compared with those of the untreated tailings. Results showed that the 50 mM CaCl2 cementation solution proved the most effective treatment solution with respect to MICP, reducing compressibility of tailings by about 300% when loaded up to 800 kPa and improving shear strength by 140%. X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope (SEM) images of treated samples further illustrated the effects of MICP on the composition and structure of the tailings specimens.\",\"PeriodicalId\":12647,\"journal\":{\"name\":\"Geomicrobiology Journal\",\"volume\":\"40 1\",\"pages\":\"360 - 371\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2023-02-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geomicrobiology Journal\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1080/01490451.2023.2176574\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geomicrobiology Journal","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/01490451.2023.2176574","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 1

摘要

历史上多次发生的尾矿坝溃坝事件表明，尾矿的安全储存对工程技术人员构成了挑战。在尾矿坝后储存尾矿是最实用的围堵方案，但这些废料的不良力学特性(低强度和高压缩性)引起了对尾矿坝稳定性的严重关注。本研究采用微生物诱导方解石沉淀(MICP)技术处理金尾矿。因此，在尾矿中富集巴氏孢杆菌，并用不同浓度的胶结液冲洗尾矿，以确定所研究尾矿中产生最高抗剪强度的CaCl2量。通过直剪试验和一维测压试验测定了其抗剪强度和压缩性，并与未处理尾矿进行了比较。结果表明，50mm CaCl2胶结液是最有效的MICP处理溶液，当加载至800kpa时，尾矿的压缩性降低了约300%，抗剪强度提高了140%。处理后样品的x射线衍射(XRD)分析和扫描电镜(SEM)图像进一步说明了MICP对尾矿样品组成和结构的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Bio-Assisted Improvement of Shear Strength and Compressibility of Gold Tailings

Abstract Safe storage of mine tailings has challenged engineers as shown by numerous historical tailings dam failures. While the storing of tailings behind tailings dams is the most practical containment solution, poor mechanical characteristics (low strength and high compressibility) of these waste materials raises serious concerns regarding the stability of tailings dams. In this study, the microbially-induced calcite precipitation (MICP) technique is used to treat gold tailings. Accordingly, tailings were enriched with Sporosarcina pasteurii and flushed with different concentrations of cementation solution to find the CaCl2 amount that produces the highest shear strength in studied tailings. Their shear strength and compressibility were measured in direct shear and one-dimensional oedometer tests and compared with those of the untreated tailings. Results showed that the 50 mM CaCl2 cementation solution proved the most effective treatment solution with respect to MICP, reducing compressibility of tailings by about 300% when loaded up to 800 kPa and improving shear strength by 140%. X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope (SEM) images of treated samples further illustrated the effects of MICP on the composition and structure of the tailings specimens.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Geomicrobiology Journal 环境科学-地球科学综合

CiteScore

4.80

自引率

8.70%

发文量

审稿时长

3.3 months

期刊介绍： Geomicrobiology Journal is a unified vehicle for research and review articles in geomicrobiology and microbial biogeochemistry. One or two special issues devoted to specific geomicrobiological topics are published each year. General articles deal with microbial transformations of geologically important minerals and elements, including those that occur in marine and freshwater environments, soils, mineral deposits and rock formations, and the environmental biogeochemical impact of these transformations. In this context, the functions of Bacteria and Archaea, yeasts, filamentous fungi, micro-algae, protists, and their viruses as geochemical agents are examined. Articles may stress the nature of specific geologically important microorganisms and their activities, or the environmental and geological consequences of geomicrobiological activity. The Journal covers an array of topics such as: microbial weathering; microbial roles in the formation and degradation of specific minerals; mineralization of organic matter; petroleum microbiology; subsurface microbiology; biofilm form and function, and other interfacial phenomena of geological importance; biogeochemical cycling of elements; isotopic fractionation; paleomicrobiology. Applied topics such as bioleaching microbiology, geomicrobiological prospecting, and groundwater pollution microbiology are addressed. New methods and techniques applied in geomicrobiological studies are also considered.