Title: Granulation of fine powder

Abstract

A mixture of fine powder including thorium oxide was converted to granulated powder by forming a first-green-body and heat treating the first-green-body at a high temperature to strengthen the first-green-body followed by granulation by crushing or milling the heat-treated first-green-body. The granulated powder was achieved by screening through a combination of sieves to achieve the desired granule size distribution. The granulated powder relies on the thermal bonding to maintain its shape and structure. The granulated powder contains no organic binder and can be stored in a radioactive or other extreme environment. The granulated powder was pressed and sintered to form a dense compact with a higher density and more uniform pore size distribution.

Inventors:

Chen, Ching-Fong

Issue Date:

Tue Aug 09 00:00:00 EDT 2016

Research Org.:

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1289917

Patent Number(s):

9409825

Application Number:

13/971,157

Assignee:

Los Alamos National Security, LLC (Los Alamos, NM)

Patent Classifications (CPCs):

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

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

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

C01F15/00 - Compounds of thorium

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

C01G43/00 - Compounds of uranium
C01G43/01 - Oxides
C01G56/00 - Compounds of transuranic elements
C01G56/005 - {Oxides

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

C01P2004/03 - obtained by SEM
C01P2004/50 - Agglomerated particles
C01P2004/60 - Particles characterised by their size
C01P2004/61 - Micrometer sized, i.e. from 1-100 micrometer
C01P2004/82 - two phases having the same anion, e.g. both oxidic phases
C01P2006/10 - Solid density
C01P2006/12 - Surface area

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

C04B2235/3229 - Cerium oxides or oxide-forming salts thereof
C04B2235/5409 - expressed by specific surface values
C04B2235/604 - Pressing at temperatures other than sintering temperatures
C04B2235/608 - Green bodies or pre-forms with well-defined density
C04B2235/77 - Density
C04B35/51 - based on compounds of actinides
C04B35/6262 - {of calcined, sintered clinker or ceramics}
C04B35/62695 - {Granulation or pelletising

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DOE Contract Number:  

AC52-06NA25396

Resource Type:

Patent

Resource Relation:

Patent File Date: 2013 Aug 20

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE