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Removal of leachable metals and recovery of alumina from utility coal ash.

Authors
Gabler-RC Jr.; Stoll-RL
Source
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8721, 1983 Jan; :1-20
Link
NIOSHTIC No.
10002701
Abstract
The extraction of metals from coal ash was investigated by the Bureau of Mines in an effort to produce a more environmentally acceptable waste and offset waste disposal costs with recovered metal values. The research was conducted in two steps: determination of the parameters that affect extraction of metals from coal ash and development of extraction-recovery procedures. Data obtained indicate that the major parameter affecting the extraction of metals from coal ash is the calcium content of the ash. Other parameters such as furnace type and operating temperature had much smaller effects on metal extraction. Two procedures were studied for metal extraction: an acid leach procedure for high-calcium ashes and a lime sinter-acid leach procedure for low-calcium ashes. An alumina product was recovered that, with sufficient washing, meets hall cell specifications. The leach residues pass the EPA ep toxicity test and are thus nonhazardous wastes available for a variety of uses.
Publication Date
19830101
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Identifying No.
RI-8721
NIOSH Division
AVRC
Source Name
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8721
State
MD
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