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Corrosion resistance of materials in the aqueous hydrochloric acid environments associated with the recovery of aluminum from kaolinitic clays.

Authors
Covino-BS Jr.; Rosen-M; Riley-WD
Source
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8565, 1981 Oct; :1-28
Link
NIOSHTIC No.
10006698
Abstract
The Bureau of Mines has conducted a laboratory and field corrosion testing program to determine materials of construction for the leaching and gas-sparging crystallization environment of the clay-HCl process in order to more fully utilize the alumina from domestically available kaolinitic clays. Laboratory tests were used to determine the corrosion rates of 22 metals and alloys by weight-loss measurements in these two environments of the process. The results of this laboratory study were used both to suggest metals and alloys for field testing and to determine the effect of the individual solution components on the corrosion behavior of the metals and alloys. Results from the field tests were used to recommend Ta, Ta-2.5w, and Ta-10w for construction of the agitators for the leaching process. The metals and alloys recommended for construction of the gas-sparging crystallizer heat exchangers were Ta, Ta-2.5w, Ta-10w, Nb, Nb-1Zr, Nb-3Zr, Nb-28Ta-10w-1Zr, Nb-10HF- 1Ti, and Zr for the first stage and Ta, Ta-2.5w, Ta-10w, Nb-28Ta-10w- 1Zr, Nb, Nb-10HF-1Ti, and Zr for the second stage.
Keywords
Alloys; Aluminum; Clay minerals; Corrosion resistance; Corrosion tests; Crystallization; Design criteria; Field tests; Heat exchangers; Hydrogen chloride; Kaolinite; Laboratory equipment; Leaching; Molybdenum; Nickel; Niobium; Procedures; Samples; Tantalum; Titanium; Zirconium
Publication Date
19811001
Document Type
IH; Report of Investigations
Fiscal Year
1982
NTIS Accession No.
PB82-135526
NTIS Price
A04
Identifying No.
RI-8565
NIOSH Division
AVRC
Source Name
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8565
State
MD
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