南华大学学报（自然科学版）2024，Vol.38Issue(6)：27-35,9.DOI:10.19431/j.cnki.1673-0062.2024.06.004
硫酸盐还原菌处理的尾矿砂砂浆试块的强度特性研究
Study on Strength Characteristics of Tailings Mortar Test Block Treated by Sulfate-reducing Bacteria
摘要
Abstract
Acidified sulfur-containing lead-zinc tailings are not suitable for use as building aggregates because they contain a large amount of leachable SO42- and heavy metal ions.The tailings of a lead-zinc mine in Hunan Province were used as raw materials.Firstly,sulfate-reducing bacteria(SRB)were used to pretreat the tailings,and the pollutant control effect was analyzed by pollutant leaching test.Then,the tailings sand before and after treatment was used to replace the natural river sand with different mass ratios to pre-pare cement mortar test blocks,and the uniaxial compressive strength test was carried out to test its strength.Finally,the electron microscope scanning test was carried out to reveal the microscopic morphology characteristics of tailings sand cement mortar under different rate of substitution.The research results show that SRB has a good removal effect on SO42- and heavy metal ions such as Cu2+,Mn2+,Zn2+and Cr6+.The compressive strength of tailings sand cement mortar treated by SRB under different substitution conditions is higher than that of untreated tailings sand cement mortar,and the strength is the highest when the tailings sand content is 10%.The incorporation of appropriate amount of lead-zinc tailings optimizes the pore structure and improves the compressive strength of mortar.The original lead-zinc tailings sand contains a large amount of SO42-,which is easy to produce expansive hydration products such as ettringite,and causes more cracks in the mortar,and that is the main mechanism of its strength degradation.关键词
SRB/铅锌尾矿砂/破坏形态/抗压强度/微观结构Key words
sulfate-reducing bacteria/lead-zinc tailings/destruction form/compressive strength/microstructure分类
矿业与冶金引用本文复制引用
陈文昭,卢铎方,杨鑫宏,刘夕奇,刘俊..硫酸盐还原菌处理的尾矿砂砂浆试块的强度特性研究[J].南华大学学报（自然科学版）,2024,38(6):27-35,9.基金项目
湖南省自然科学基金项目(2023JJ30511) （2023JJ30511）
湖南省自然资源科研项目(20230144DZ) （20230144DZ）
湖南省教育厅项目(重点)(18A252) （重点）
湖南省研究生科研创新项目(QL20220216) （QL20220216）
