IL25985A - Method of preparation of sintered pollucite and its application to the production of radioactive sources - Google Patents

Method of preparation of sintered pollucite and its application to the production of radioactive sources

Info

Publication number
IL25985A
IL25985A IL2598566A IL2598566A IL25985A IL 25985 A IL25985 A IL 25985A IL 2598566 A IL2598566 A IL 2598566A IL 2598566 A IL2598566 A IL 2598566A IL 25985 A IL25985 A IL 25985A
Authority
IL
Israel
Prior art keywords
sintered
preparation
powder
pollucite
temperature
Prior art date
Application number
IL2598566A
Other languages
Hebrew (he)
Original Assignee
Commissariat Energie Atomique
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR21959A external-priority patent/FR1478339A/en
Priority claimed from FR21960A external-priority patent/FR1478340A/en
Application filed by Commissariat Energie Atomique filed Critical Commissariat Energie Atomique
Publication of IL25985A publication Critical patent/IL25985A/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00Silicon; Compounds thereof
    • C01B33/20Silicates
    • C01B33/26Aluminium-containing silicates, i.e. silico-aluminates
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00Silicon; Compounds thereof
    • C01B33/20Silicates
    • C01B33/36Silicates having base-exchange properties but not having molecular sieve properties
    • C01B33/38Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
    • C01B33/40Clays
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00Silicon; Compounds thereof
    • C01B33/20Silicates
    • C01B33/36Silicates having base-exchange properties but not having molecular sieve properties
    • C01B33/38Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
    • C01B33/42Micas ; Interstratified clay-mica products
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00Silicon; Compounds thereof
    • C01B33/20Silicates
    • C01B33/36Silicates having base-exchange properties but not having molecular sieve properties
    • C01B33/46Amorphous silicates, e.g. so-called "amorphous zeolites"
    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21GCONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G4/00Radioactive sources
    • G21G4/04Radioactive sources other than neutron sources

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Catalysts (AREA)

Description

the relates to for intended a caeei a which cubic system and has composition is knows that this mineral he obtained a process consists in heating in am autoclave and a mixture of a colloidal of silica with hydroxide fey hydrolysis aluminum and hydroxide formed fey the action of caesium sulphate em a dry in heating to AX a crushed size of order 150 with caesium sulphate to approximately water to these are and d and produce crystalline pollucite cannot readily he This invention has the to provide simple and the preparation of an powder of pollucite which can readily be shaped and sintered to he into crystalline In the method according to the a mixture and aluminum stoichiometric proportions is evaporated to preferably with the residue is heated to a temperature below the s is and the compac β are sintered at a temperature ef about the and salts used are preferably the nitrates because their relatively lew decomposition evaporation to dryness the is preferably performed at a temperature about the mixture the course of the evaporation in order to the mixture nitrates begin to decompose above The heating rate in this stage should be rather about to amorphous powder produced by the heat is and then pelleted under relatively high for about The use of high pressures at this stage reduces the shrinkage in the subsequent sintering pollucite pellets are preferably at a temperature of about The sintered produet has a specific gravity of about In preferred embodiment of the the dry residue of the evaporation process is subjected to prolonged calcination at a temperature below and preferably to a par iele then the powder is treated with steam and the are sintered in two stages at different temperature levels of about and The oaloining of the powder is preferably carried a a within the range of to in until the complete decomposition of the caesium She required duration of the calcining depends on the partiele size of the powder and the thickness of the layer of the residue obtained after For the calcining takes about 40 hours in the case of a powder having an average particle diameter of mm and a residue layer thickness of 6 and about 90 hours im the case of a powder having an average partiele diameter of 1 and a residue layer thickness of 10 The amorphous product of the heat treatment is ground to an average particle 10 The grinding operation is preferably earried out in which makes for a good partiele distribution and prevents the formation of dust She of the powder with especially in the embodiment where the grinding is effected in ether and the latter has been has the advantage of activating the making it more susceptible to the shaping sintering For the steam treatment the is preferably heated for about 15 to 50 to about in an atmosphere saturated with water This operation imparts to the powder ah improved plasticity and makes it easier to the steam treatment the amorphous powder is pelleted under a pressure about 2000 pellets are sintered in two at two the first proceeding at approximately insufficientOCRQuality

Claims (1)

1. CLAIMS od for the preparation of sintered the of forming a mixture of a colloidal with ions of al salts in stoichiometric evaporating the while heating the to a compacting the powder thus sintering the at a temperature of A to Claim wherein the the is to calcination caesium and salts used are the A according to 1 or wherein the operation is earried out at a pressure of about 2500 A according to Claim wherein the calcining is effected a temperature within the range of to A method to Claim wherein the ealeined is ground average partiele size of 10 7 A method according to wherein the powder is treated with steam at a temperature of about for a period of 15 to 50 A for the preparation of sintered substantially hereinbefore A source in that it is tituted by sintered obtained in accordance with the method of any of the preceding the Applicants A insufficientOCRQuality
IL2598566A 1965-06-23 1966-06-19 Method of preparation of sintered pollucite and its application to the production of radioactive sources IL25985A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR21959A FR1478339A (en) 1965-06-23 1965-06-23 Sintered pollucite ceramic radioactive source
FR21960A FR1478340A (en) 1965-06-23 1965-06-23 Process for preparing sintered pollucite

Publications (1)

Publication Number Publication Date
IL25985A true IL25985A (en) 1970-02-19

Family

ID=26164292

Family Applications (1)

Application Number Title Priority Date Filing Date
IL2598566A IL25985A (en) 1965-06-23 1966-06-19 Method of preparation of sintered pollucite and its application to the production of radioactive sources

Country Status (9)

Country Link
BE (1) BE682573A (en)
CH (1) CH470323A (en)
DE (1) DE1567418B2 (en)
ES (1) ES328255A1 (en)
GB (1) GB1119768A (en)
IL (1) IL25985A (en)
LU (1) LU51374A1 (en)
NL (1) NL6608566A (en)
SE (1) SE300944B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04367510A (en) * 1990-12-19 1992-12-18 Tosoh Corp Pollucite powder having low thermal expansion coefficient and its synthesis
CN109704351A (en) * 2019-03-05 2019-05-03 西南科技大学 A kind of low temperature of pollucite exempts to calcine preparation method

Also Published As

Publication number Publication date
LU51374A1 (en) 1966-08-22
GB1119768A (en) 1968-07-10
DE1567418B2 (en) 1972-05-04
BE682573A (en) 1966-11-14
CH470323A (en) 1969-03-31
DE1567418A1 (en) 1970-08-13
SE300944B (en) 1968-05-13
NL6608566A (en) 1966-12-27
ES328255A1 (en) 1968-01-01

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