GB1125915A - Production of microspheres - Google Patents

Production of microspheres

Info

Publication number
GB1125915A
GB1125915A GB1716966A GB1716966A GB1125915A GB 1125915 A GB1125915 A GB 1125915A GB 1716966 A GB1716966 A GB 1716966A GB 1716966 A GB1716966 A GB 1716966A GB 1125915 A GB1125915 A GB 1125915A
Authority
GB
United Kingdom
Prior art keywords
microspheres
aquasol
mixture
puo
liquid medium
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB1716966A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WR Grace and Co
Original Assignee
WR Grace and Co
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 US449867A external-priority patent/US3312632A/en
Priority claimed from US506231A external-priority patent/US3345437A/en
Application filed by WR Grace and Co filed Critical WR Grace and Co
Publication of GB1125915A publication Critical patent/GB1125915A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/06—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a liquid medium
    • B01J2/08—Gelation of a colloidal solution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/06—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a liquid medium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Abstract

1,125,915. Oxide and carbide microspheres. W. R. GRACE & CO. 19 April, 1966 [21 April, 1965], No. 17169/66. Heading C1A. [Also in Division G6] Metal oxide microspheres are made by mixing an aquasol of UO 3 , UO 2 , ThO 2 , PuO 2 , PuO 3 , ZrO 2 , BeO, Y 2 O 3 , or a mixture thereof, with an NH 3 -releasing agent, forming droplets of the mixture in a liquid medium in which water has a low solubility and whose temperature is high enough to release NH 3 from the agent and maintaining the droplets in contact with the liquid until they are solidified to microspheres. The term " aquasol " also includes aquasols that have been flocculated by reason of containing dissolved metal salts. The quantity of dissolved salt in the " aquasol " can be above 0À1 g./1. and less than the quantity required for flocculation. The aquasol can also contain a U<SP>4+</SP>, (UO 2 )<SP>2+</SP>, Th<SP>4+</SP>, Pu<SP>4+</SP>, (PuO 2 )<SP>2+</SP>, (ZrO)<SP>2+</SP>, Be<SP>2+</SP>, or Y<SP>3+</SP> salt or mixture thereof and/or carbon (to form carbides) and surfactants. The NH 3 -releasing agent can be hexamethylenetetramine, acetamide, ammonium carbamate, ammonium cyanate or urea or a mixture thereof. The amount of NH 3 -releasing agent used may be sufficient to adjust the pH of the aquasol to 1À0 to 0À1 pH units below the gelation pH of the sol., e.g. an amount at least suficient to provide 70% of the stoichiometric quantity of NH 3 required to precipitate the salt. The total concentration of metal compounds in the aquasol, expressed as the oxides can be from 1 to 500 g./1. The liquid medium can have a solubility for water of 1-30% wt., e.g. C 4 -C 10 alcohol. The droplets and liquid medium can flow concurrently or countercurrently. The microspheres produced can be washed, dried and sintered to form the final microsphere pro - duct. Microspheres of a size range of 50-400Á are disclosed. The microspheres can be used as a nuclear fuel.
GB1716966A 1965-04-21 1966-04-19 Production of microspheres Expired GB1125915A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US449867A US3312632A (en) 1965-04-21 1965-04-21 Method for making metal oxide microspheres
US506231A US3345437A (en) 1965-11-03 1965-11-03 Sol-gel microsphere forming process using dissolved ammonia in the dehydrating solvent

Publications (1)

Publication Number Publication Date
GB1125915A true GB1125915A (en) 1968-09-05

Family

ID=27035846

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1716966A Expired GB1125915A (en) 1965-04-21 1966-04-19 Production of microspheres
GB4798566A Expired GB1158742A (en) 1965-04-21 1966-10-26 Production of Microspheres

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB4798566A Expired GB1158742A (en) 1965-04-21 1966-10-26 Production of Microspheres

Country Status (3)

Country Link
DE (2) DE1542179B1 (en)
GB (2) GB1125915A (en)
NL (2) NL6605275A (en)

Also Published As

Publication number Publication date
DE1542179B1 (en) 1970-11-12
NL6605275A (en) 1966-10-24
GB1158742A (en) 1969-07-16
NL6615444A (en) 1967-05-05
DE1542191A1 (en) 1971-02-25

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