Details:

Personal Author:
MacDonald, D. J. (David J.) ; Henry, H. G. (Helen G.) ; Bauer, D. J. (Donald J.)
MacDonald, D. J. (David J.) ; Henry, H. G. (Helen G.) ; Bauer, D. J. (Donald J.) Less -
Corporate Authors:
United States. Bureau of Mines.
Description:
"The Bureau of Mines has conducted bench-scale investigations leading to the design of an integrated process for producing reactor-grade zirconium oxide (zro2) from zircon sand, which avoids the air pollution, water pollution, fire hazard, and odor problems associated with the hexone-thiocyanate process. The integrated process consists of three steps: production of crude zirconyl sulfate solution, solvent extraction, and production of zro2 from strip liquor. This report describes the solvent extraction step. Multistage, countercurrent liquid-liquid extraction with a Tertiary amine in kerosine was used to separate zirconium from a dilute h2so4 solution containing hafnium and other impurities. Process steps described include extraction from an aqueous feed solution to form a hafnium-contaminated, zirconium-bearing organic-phase solution, scrubbing to separate zirconium from coextracted hafnium, stripping to transfer hafnium-free zirconium into an aqueous strip liquor, chloride-loading to produce a chloride-bearing organic solution, scrubbing with the chloride-loaded organic solution to remove traces of uranium impurity from the zirconium-bearing strip liquor, and regeneration to prepare the organic solution for reuse. These steps were performed simultaneously in steady-state, bench-scale experiments. Zirconium recovery of up to 93 pct was achieved. Results of an economic evaluation are included." - NIOSHTIC-2

NIOSH no. 10003305


Subject:
[+]
Extraction (Chemistry)
Zirconyl Sulfate.

Series:
Report of investigations (United States. Bureau of Mines) ; 8849
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:a2d6ae6d0871895b4f4d6b210b9f50fbeb2eb70a425553e4f69e081a61ac1252
File Type:

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