Full
Outline
In order to solve the technical bottleneck of low reaction activity and limited usage of IOT (iron ore tailings) in preparation of geopolymers, IOT-based geopolymers were prepared with high-silica IOT and low-silica IOT as the main raw materials, metakaolin as the correction material and water glass as the alkali activator. The thermal-chemical activation was used to activate the activity of IOT. The XRD and SEM/EDS were used to analyze the changes in mineral composition of IOT before and after activation, and the influence of thermal chemical activation at 500 ℃ and 700 ℃ on the microstructure and structure of geopolymers was studied. The results show that the reactivity of IOT after thermal-chemical activation is significantly increased, the geopolymers have dense internal structure and the compressive strength is increased significantly. The suitable thermal-chemical activation temperature is 500 ℃. At the same thermal-chemical activation temperature, IOT with a 80 μm sieve residue of 10% exhibit the highest activity and the geopolymers prepared by them have the highest compressive strength. Compared with low-silica IOT, high-silica IOT can obtain a higher reactivity after thermal-chemical activation, and the geopolymers prepared with high-silica IOT have a higher compressive strength. Thermal-chemical activation causes partial transformation of low activity minerals in IOT, forming highly active minerals such as soluble sodium silicate and metastable amorphous substances.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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