Synthesis of zeolite-P from coal fly ash derivative and its utilisation in mine-water remediation
| Autor: | Annabelle Ellendt, Leslie F. Petrik, Viswanath R.K. Vadapalli, Gillian Balfour, Wilson M. Gitari |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Potassium
Sodium chemistry.chemical_element Raw material General Biochemistry Genetics and Molecular Biology lcsh:Social Sciences Mining engineering circumneutral mine waters lcsh:Social sciences (General) Zeolite lcsh:Science lcsh:Science (General) Dissolution low temperature synthesis zeolite-P Human decontamination Acid mine drainage lcsh:H fly ash chemistry Fly ash solid residues General Earth and Planetary Sciences lcsh:Q lcsh:H1-99 General Agricultural and Biological Sciences Nuclear chemistry lcsh:Q1-390 acid mine drainage |
| Zdroj: | South African Journal of Science, Volume: 106, Issue: 5-6, Pages: 62-68, Published: JUN 2010 South African Journal of Science, Vol 106, Iss 5/6 (2010) |
| Popis: | Solid residues resulting from the active treatment of acid mine drainage with coal fly ash were successfully converted to zeolite-P under mild hydrothermal treatment conditions. Scanning electron microscopy showed that the zeolite-P product was highly crystalline. The product had a high cation exchange capacity (178.7 meq / 100 g) and surface area (69.1 m 2 /g) and has potential application in waste-water treatment. A mineralogical analysis of the final product identified zeolite-P, as well as mullite and quartz phases, which indicated incomplete dissolution of the fly ash feedstock during the ageing step. Further optimisation of the synthesis conditions would be required to attain complete utilisation of the feedstock. The zeolite-P was tested for decontamination potential of circumneutral mine water. High removal efficiency was observed in the first treatment, but varied for different contaminants. The synthesised zeolite-P exhibited a high efficiency for the removal of heavy metal cations, such as aluminium, iron, manganese, zinc, copper and nickel, from contaminated mine water, even with repeated use. For potassium, calcium, strontium and barium, the removal was only efficient in the first treatment and decreased rapidly with subsequent treatments, indicating preferential adsorption of the other metals. A continuous release of sodium was observed during decontamination experiments, which decreased with subsequent treatments, confirming that sodium was the main exchangeable charge-balancing cation present in the zeolite-P product. |
| Databáze: | OpenAIRE |
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