Title: Production of sintered porous metal fluoride pellets

Abstract

Porous pellets characterized by a moderately reactive crust and a softer core of higher reactivity are produced by forming agglomerates containing a metal fluoride powder and a selected amount ofwater. The metal fluoride is selected to be sinterable and essentially non-reactive with gaseous fluorinating agents. The agglomerates are contacted with a gaseous fluorinating agent under controlled conditions whereby the heat generated by localized reaction of the agent and water is limited to values effccting bonding by localized sintering. Porous pellets composed of cryolite (Na/sub 3/AlF/sub 6/) can be used to selectively remove trace quantities of niobium pentafluoride from a feed gas consisting predominantly of uranium hexafluoride. (Official Gazette)

Inventors:

Anderson, L W; Stephenson, M J

Issue Date:

1973-12-25

Research Org.:

Originating Research Org. not identified

OSTI Identifier:

4301191

Patent Number(s):

3781392

Assignee:

to United States Atomic Energy Commission

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J2/00 - Processes or devices for granulating materials {, e.g. fertilisers} in general
B01J2/20 - by expressing the material, e.g. through sieves and fragmenting the extruded length
B01J20/00 - Solid sorbent compositions or filter aid compositions

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C01B33/103 - {Fluosilicic acid
C01B9/08 - Fluorides

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01D - COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM

C01D15/04 - Halides
C01D3/02 - Fluorides

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01F - COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS

C01F7/54 - Double compounds containing both aluminium and alkali metals or alkaline-earth metals

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F

C01G33/00 - Compounds of niobium

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

C01P2006/12 - Surface area
C01P2006/60 - Optical properties, e.g. expressed in CIELAB-values

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NSA Number:

NSA-29-029080

Resource Type:

Patent

Resource Relation:

Patent File Date: 1971 Oct 01; Other Information: B01j1/22. Orig. Receipt Date: 30-JUN-74

Country of Publication:

United States

Language:

English

Subject:

N40210* -Chemistry-Inorganic, Organic, & Physical Chemistry-Chemical & Physiochemical Properties; *ALKALI METAL COMPOUNDS- MATERIALS WORKING; *ALKALINE EARTH METAL COMPOUNDS- MATERIALS WORKING; *ALUMINIUM FLUORIDES- MATERIALS WORKING; *BISMUTH FLUORIDES- MATERIALS WORKING; *COPPER FLUORIDES- MATERIALS WORKING; *FLUORIDES- MATERIALS WORKING; *MAGNESIUM FLUORIDES- MATERIALS WORKING; *NICKEL FLUORIDES- MATERIALS WORKING; *POTASSIUM FLUORIDES- MATERIALS WORKING; *SILICON FLUORIDES- MATERIALS WORKING; *SODIUM FLUORIDES- MATERIALS WORKING; *ZIRCONIUM FLUORIDES- MATERIALS WORKING; ADSORPTION; NIOBIUM FLUORIDES; POWDER METALLURGY; PURIFICATION; SINTERING; TRACE AMOUNTS; URANIUM HEXAFLUORIDE