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Shaft Furnace Reduction-oxidation Roasting of Pelletized Alunite Dust.

Authors
Riley-JM; Edlund-VE; Nissen-WI
Source
MISSING :21 pages
Link
NIOSHTIC No.
10003171
Abstract
The Bureau of Mines investigated a promising new technology for recovering al2o3 from alunite to support the Bureau's alumina miniplant project. Results are presented for a study of the technical feasibility of treating alunite crushing and grinding reject fines for recovery of al2o3. Alunite pellets having sufficient strength and resistance to degradation were produced by combining fines and coarse alunite with a koh binder. The best pellets were prepared, in a laboratory pelletizer, by adding 1 pct koh as a 5-pct solution to a mixture of 40 pct alunite dust (98 pct minus 65 mesh) and 60 pct coarse alunite (minus 20 plus 65 mesh). Calcines suitable for k2so4 and al2o3 recovery were produced by reducing dehydrated alunite pellets with sulfur in a laboratory shaft furnace for 4 h at 600 deg c, followed by air oxidation of the reduced calcine for 1 h at 600 deg c. This report presents design calculations, schematic diagrams, and discussions of the essential features of a proposed process research unit--a continuous, 6-lb/h alunite shaft furnace--for studying the process.
Publication Date
19830101
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Identifying No.
RI 8821
NIOSH Division
SLRC;
Source Name
MISSING
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