化工矿物与加工2025，Vol.54Issue(3)：38-47,10.DOI:10.16283/j.cnki.hgkwyjg.2025.03.005
矿渣基高硫尾砂充填体力学性能及其微观结构研究
Study on the mechanical properties and microstructure of slag-based high-sulfur tailings filling body
摘要
Abstract
The compatibility between ordinary Portland cement and high-sulfur tailings is poor.In order to improve the mechanical properties of the high-sulfur tailings cemented filling material and reduce the cost of filling materials,a feasibility study was conducted on the activation of slag micro powder by quicklime desulfurization gypsum.Using uni-axial compressive strength test,physical and chemical analysis,and scanning electron microscopy testing,the influ-ence of cement substitution rate on the mechanical properties of high sulfur tailings filling material was investigated.The optimal ratio of different excitation materials was explored,and the internal microstructure of the filling material was observed to analyze the excitation mechanism of high sulfur tailings composite filling material.The results show that compared to using 100%cement as the bonding material(compressive strength＜1.0 MPa at 7 days),the com-pressive strength of the bonding fillers in each activation scheme was higher;The activation effect of quicklime desul-furization gypsum is similar to that of quicklime activation scheme in the early stage,and the activation effect is more significant at 14 days of age.The optimal ratio of quicklime,desulfurization gypsum,and slag powder is 1∶1∶8;The improvement effect of desulfurization gypsum on the early strength of high sulfur tailings filling material is not significant.The comprehensive performance of slag based composite filling material is better than that of cement,and it can reduce the erosion effect of SO42-in alkaline environment.关键词
高硫尾砂/生石灰/脱硫石膏/矿渣微粉/抗压强度/微观结构Key words
high-sulfur tailings/quicklime/desulfurization gypsum/slag powder/compressive strength/micro-structure分类
矿业与冶金引用本文复制引用
张明,王书新,钟志强,严宏君,张熠,薛改利..矿渣基高硫尾砂充填体力学性能及其微观结构研究[J].化工矿物与加工,2025,54(3):38-47,10.基金项目
中国博士后科学基金项目(2022M711432) （2022M711432）
山西省青年基金项目(202103021223114). （202103021223114）
