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| Study on the Preparation and Properties of Iron Tailing-slag Based Geopolymer |
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Received:April 11, 2024
Revised:April 25, 2024
Accepted:May 06, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:iron tailing; blast furnace slag; fly ash; geoploymer; compressive strength |
| Author | Institution |
| sunshuangyue |
Yanching Institute of Technology |
| wuhong |
Yanching Institute of Technology |
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| Abstract: |
| At present, the production of iron tailing in China is high, but the utilization rate is still low. In order to achieve the high value-added utilization of the iron tailing, the geopolymer cementitious materials were prepared by iron tailing, blast furnace slag and fly ash as the aluminosilicate raw materials, which were activated by mechanical grinding and alkali activators. The effects of the ratio of blast furnace slag and iron tailing and content of water glass activators on the compressive strength of the geopolymer samples were studied. The formation mechanism of geopolymer cementitious materials was analyzed. The results show that the iron tailing and blast furnace slag are activated by mechanical grinding, the grinding time is more than 60min, the increase of specific surface area becomes slow. Considering the activity of raw materials and cost, the mechanical grinding time is 60min. When the content of water glass is 7%, the ratio of blast furnace slag and iron tailing is 5:3, the content of water glass is 10%, the compressive strength of the 3d, 7d and 28d geopolymer samples respectively reach 10.7MPa、18.9MPa and 32.9MPa. In the curing process of the geopolymer samples, with the extension of curing time, the structure of the samples becomes denser and denser. The structure of the 28d sample is more compact, the gaps between the raw material particles are filled by the generated gel products, and the unreacted raw material particles are wrapped by the generated gel products, which bond with the adjacent gel products to form a whole. The compact structure is beneficial to improve the compressive strength of the samples. |
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