Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 24, Issue 5, Pages 1596-1603Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63230-1
Keywords
fly ash; ammonium hydrogen sulfate; alumina; extraction
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Funding
- National Basic Research Program of China [200703613603]
- China Postdoctoral Science Foundation [2013M530934]
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NH4HSO4 roasting technology was used for preparing Al2O3 from fly ash. First, Al and Fe were extracted from fly ash by NH4HSO4 roasting and deionized water leaching. Then, the Al and Fe in the leached liquid were precipitated by adding NH4HCO3 solution. After the mixed precipitations of Al(OH)(3) and Fe(OH)(3) were leached by NaOH solution, the NaAl(OH)(4) solution was decomposed by carbonation. Finally, the pure Al(OH)3 was calcined to alpha-Al2O3. The optimal conditions of the whole technology were determined by experiments. The quality of alpha-Al2O3 product is up to the technical indicator of YS/T 274-1998 standard.
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