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Title: Laboratory studies of the behavior of undissolved solids in both pulsed and packed column extraction systems

Abstract

A substantial fraction of the finely divided undissolved solid material found in nuclear fuel reprocessing dissolver-product solutions is hydrophobic and tends to ``seek`` any organic-aqueous interface existing within countercurrent liquid-liquid extraction systems. While passing through pulsed-type columns this material is swept out of the aqueous phase by the combined surface area of the tiny bubbles of dispersed phase. Because these bubbles have a net velocity towards the end of the column where the nominal interface is located, the solids are swept in that direction too. These solids tend to gather in a three-phase ``crud`` layer at the nominal interface point. At equilibrium, about the same amount breaks off from the crud layer and escapes into the liquid exiting from that end of the column as enters it from the other side. If large enough, the crud layer can even interfere with interface detection and control equipment. In packed-column extraction systems, an additional problem is that feed solids can accumulate within the packing material to the point that the column `` floods`` or even totally plugs. The keys to preventing solids-related problems is the correct choice of interface level, and with packed columns, the addition of a ``pulsing leg`` at themore » bottom of the column. Pulsing packed column systems not only prevents solids from settling onto packing material but it also increses the number of theoretical stages available for extraction. 3 figs., 2 tabs.« less

Authors:
Publication Date:
Research Org.:
Westinghouse Idaho Nuclear Co., Inc., Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10163681
Report Number(s):
WINCO-11509; CONF-8905122-10
ON: DE92017464
DOE Contract Number:  
AC07-84ID12435
Resource Type:
Conference
Resource Relation:
Conference: 13. actinide separations conference,Idaho Falls, ID (United States),May 1989; Other Information: PBD: 18 Apr 1989
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; EXTRACTION COLUMNS; FOULING; REPROCESSING; SOLIDS; RESIDUES; DISSOLUTION; BUBBLES; INTERFACES; SIMULATION; PULSES; TALC; TBP; DODECANE; CONTROL SYSTEMS; ELECTRODES; URANIUM; COLUMN PACKING; 400105; 050800; SEPARATION PROCEDURES; SPENT FUELS REPROCESSING

Citation Formats

Siemer, D D. Laboratory studies of the behavior of undissolved solids in both pulsed and packed column extraction systems. United States: N. p., 1989. Web.
Siemer, D D. Laboratory studies of the behavior of undissolved solids in both pulsed and packed column extraction systems. United States.
Siemer, D D. 1989. "Laboratory studies of the behavior of undissolved solids in both pulsed and packed column extraction systems". United States. https://www.osti.gov/servlets/purl/10163681.
@article{osti_10163681,
title = {Laboratory studies of the behavior of undissolved solids in both pulsed and packed column extraction systems},
author = {Siemer, D D},
abstractNote = {A substantial fraction of the finely divided undissolved solid material found in nuclear fuel reprocessing dissolver-product solutions is hydrophobic and tends to ``seek`` any organic-aqueous interface existing within countercurrent liquid-liquid extraction systems. While passing through pulsed-type columns this material is swept out of the aqueous phase by the combined surface area of the tiny bubbles of dispersed phase. Because these bubbles have a net velocity towards the end of the column where the nominal interface is located, the solids are swept in that direction too. These solids tend to gather in a three-phase ``crud`` layer at the nominal interface point. At equilibrium, about the same amount breaks off from the crud layer and escapes into the liquid exiting from that end of the column as enters it from the other side. If large enough, the crud layer can even interfere with interface detection and control equipment. In packed-column extraction systems, an additional problem is that feed solids can accumulate within the packing material to the point that the column `` floods`` or even totally plugs. The keys to preventing solids-related problems is the correct choice of interface level, and with packed columns, the addition of a ``pulsing leg`` at the bottom of the column. Pulsing packed column systems not only prevents solids from settling onto packing material but it also increses the number of theoretical stages available for extraction. 3 figs., 2 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/10163681}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 18 00:00:00 EDT 1989},
month = {Tue Apr 18 00:00:00 EDT 1989}
}

Conference:
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