Kinetics of desilification pretreatment from high-aluminium coal fly ash in alkaline medium under pressure
| Autor: | Chen Long, Lu Min, Chang Yanwei |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
inorganic chemicals
Chemistry Sodium Kinetics technology industry and agriculture chemistry.chemical_element Mineralogy 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Leaching rate complex mixtures 030226 pharmacology & pharmacy Shrinking core model 03 medical and health sciences 0302 clinical medicine Chemical engineering Aluminium Fly ash Surface chemical Leaching (metallurgy) 0210 nano-technology |
| Zdroj: | Chemical Research in Chinese Universities. 33:282-286 |
| ISSN: | 2210-3171 1005-9040 |
| DOI: | 10.1007/s40242-017-6230-y |
| Popis: | In this paper, desilification for high-aluminium coal fly ash in alkaline media under pressure was reported to improve the efficiency of sodium leaching. Factors such as the alkaline quantity, reaction temperature, time and liquid-to-solid ratio on desilification were studied in detail. At the same time, the kinetics of desilification were analysed to further reveal the leaching mechanism. The results showed that the alkaline quantity, reaction temperature and liquid-to-solid ratio had significant effects on the desilification efficiency with increasing reaction time. The maximum SiO2 leaching rate was 65.78% under the optimal experimental conditions. According to the shrinking core model, the process of leaching is controlled by surface chemical reactions in the earlier stage and diffusion of the solid layer in the later stage. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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