Alumina and Silica Produced by Chlorination of Power Plant Fly Ash Treatment
| Autor: | Valery Kaplan, Erzhan Zholdasbay, Galamat Daruesh, Aidar Argyn, Nurlan Dosmukhamedov |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Power station
Chemistry business.industry fungi Inorganic chemistry Extraction (chemistry) technology industry and agriculture 0211 other engineering and technologies General Engineering chemistry.chemical_element Coal combustion products Mullite 02 engineering and technology Calcium 021001 nanoscience & nanotechnology Yield (chemistry) Fly ash polycyclic compounds General Materials Science Coal 0210 nano-technology business 021102 mining & metallurgy |
| Zdroj: | JOM. 72:3348-3357 |
| ISSN: | 1543-1851 1047-4838 |
| DOI: | 10.1007/s11837-020-04267-5 |
| Popis: | We describe a process of chlorination of fly ash with either chlorine gas or calcium chloride, which successfully decomposes mullite and permits the extraction of a number of industrially useful, acid-soluble compounds. As a guide for determining optimal input molar ratios and temperatures, the Gibbs energies for three groups of reactions of major fly ash components between 973 K and 1473 K were calculated: (1) chlorination with chlorine gas; (2) chlorination with chlorine gas in the presence of coal; (3) chlorination with calcium chloride. Laboratory-scale measurements with fly ash from six coal combustion power plants in Kazakhstan show that chlorination with either calcium chloride or chlorine gas allows efficient extraction of alumina (α-Al2O3) and silica with both high yield and purity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink