Laboratory studies of the behavior of undissolved solids in both pulsed and packed column extraction systems
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.
- Research Organization:
- Westinghouse Idaho Nuclear Co., Inc., Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC07-84ID12435
- OSTI ID:
- 7291953
- Report Number(s):
- WINCO-11509; CONF-8905122-10; ON: DE92017464
- Resource Relation:
- Conference: 13. actinide separations conference, Idaho Falls, ID (United States), May 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
EXTRACTION COLUMNS
FOULING
BUBBLES
COLUMN PACKING
CONTROL SYSTEMS
DISSOLUTION
DODECANE
ELECTRODES
INTERFACES
PULSES
REPROCESSING
RESIDUES
SIMULATION
SOLIDS
TALC
TBP
URANIUM
ACTINIDES
ALKANES
BUTYL PHOSPHATES
ELEMENTS
ESTERS
EXTRACTION APPARATUSES
HYDROCARBONS
METALS
MINERALS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PACKINGS
PHOSPHORIC ACID ESTERS
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SILICATE MINERALS
400105* - Separation Procedures
050800 - Nuclear Fuels- Spent Fuels Reprocessing