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Investigation of Methods for Producing Reactor-grade Zirconium Oxide from a Zirconium-Bearing Chloride-sulfate Strip Liquor Solution.

Authors
MacDonald-DJ; Defilippi-CE; Henry-HG
Source
MISSING :9 pages
Link
NIOSHTIC No.
10003307
Abstract
The Bureau of Mines investigated two alternative methods for treating a zirconium-bearing chloride-sulfate strip liquor to obtain reactor-grade zro2. One method involves neutralization with nh3 and the other hydrothermal precipitation. The strip liquor was derived from zircon sand by a Bureau of Mines method for separating zirconium and hafnium via solvent extraction with a Tertiary amine. Neutralization with nh3 to precipitate hydrous zirconium oxide required 0.9 to 1.1 G nh3 per gram of zirconium. The nh3 can be recovered for recycle. Zro2 that met reactor-grade specifications was produced by precipitation with nh3. Hydrothermal precipitation of zro2 from strip liquor required that the solution be maintained at 260 deg c and 680 psi for 10 min and in a noncorrodible pressure vessel. In bench-scale experiments both methods gave zirconium recoveries greater than 99 pct.
Publication Date
19840101
Document Type
IH; Report of Investigations
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
RI 8850
NIOSH Division
RERC;
Source Name
MISSING
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