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- Title
细粒级铁尾矿粉的性能与改性机理研究.
- Authors
王 欢; 翁金红; 王嘉昊; 冯 建; 刘娟红; 韩方晖
- Abstract
In this paper, fine-grained iron tailings fines were selected and modified with modifiers. The chemical and mineral composition, fineness, burn-off, water demand ratio and activity index of the modified iron tailings powder were studied. The properties are compared with those of Class II fly ash to investigate the modification effect and modification mechanism of the modifier on the iron tailing powder. The results of the study show that the chemical and mineral composition of fine-grained iron tailings fines is similar to that of fly ash. The fine-grained iron tailings fines have a particle content of >45 μm of 17.7% and a burn-off of 6.5%.The water demand ratio after modification was 97.2%,all of which met the relevant national standards for Class II fly ash. The best modification effect was achieved by the alkali composite modifier, with the activity index of modified iron tailing powder being 95.6%,95.7% and 89.3% at 3 d, 7 d and 28 d respectively, all of which were higher than that of Class II fly ash. As the specific surface area of modified iron tailing powder increased, the compressive strength of net slurry increased. After the modified iron tailing powder is treated, the silica-oxygen bonds in SiO2 at the interface will be reorganised and reunification reaction will occur, which is macroscopically manifested as an increase in compressive strength. The smaller the particle size of iron tailing powder, the more significant this reunification reaction is, and the more obvious the increase of compressive strength.
- Subjects
FLY ash; IRON; COMPRESSIVE strength; PARTICULATE matter; SURFACE area; IRON powder
- Publication
Fly Ash Comprehensive Utilization, 2023, Vol 37, Issue 5, p71
- ISSN
1005-8249
- Publication type
Article
- DOI
10.19860/j.cnki.issn1005-8249.2023.05.012