GB900790A - Improvements in or relating to crystalline synthetic cryolite - Google Patents

Improvements in or relating to crystalline synthetic cryolite

Info

Publication number
GB900790A
GB900790A GB32850/60A GB3285060A GB900790A GB 900790 A GB900790 A GB 900790A GB 32850/60 A GB32850/60 A GB 32850/60A GB 3285060 A GB3285060 A GB 3285060A GB 900790 A GB900790 A GB 900790A
Authority
GB
United Kingdom
Prior art keywords
cryolite
solution
fluoride
sodium aluminate
saturated
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
GB32850/60A
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.)
Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
Original Assignee
Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
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 FR805954A external-priority patent/FR76352E/en
Priority claimed from FR826806A external-priority patent/FR1264569A/en
Application filed by Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU filed Critical Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
Publication of GB900790A publication Critical patent/GB900790A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0036—Crystallisation on to a bed of product crystals; Seeding
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B15/00—Peroxides; Peroxyhydrates; Peroxyacids or salts thereof; Superoxides; Ozonides
    • C01B15/055—Peroxyhydrates; Peroxyacids or salts thereof
    • C01B15/12—Peroxyhydrates; Peroxyacids or salts thereof containing boron
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/48—Halides, with or without other cations besides aluminium
    • C01F7/50—Fluorides
    • C01F7/54—Double compounds containing both aluminium and alkali metals or alkaline-earth metals
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/68—Aluminium compounds containing sulfur
    • C01F7/74—Sulfates
    • C01F7/76—Double salts, i.e. compounds containing, besides aluminium and sulfate ions, only other cations, e.g. alums
    • C01F7/762—Ammonium or alkali metal aluminium sulfates
    • C01F7/765—Ammonium aluminium sulfates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

<PICT:0900790/III/1> Crystal agglomerates of cryolite are produced by maintaining fine cryolite crystals as a fluidized suspension in an up-flowing super-saturated cryolite solution, whereby agglomerates form and are withdrawn from the suspension. The initial cryolite particles are generally of less than micron size, whilst the agglomerates have a size from 60 to 450 microns and an apparent density from 0,9 to 1,29 grams/c.c. The super-saturated cryolite solution employed may be formed in situ by reaction between sodium aluminate and hydrofluoric acid, sodium fluoride and aluminium fluoride or sulphate, or between ammonium fluoride and sodium aluminate, either in the fluidized bed or in lines leading thereto, for example in the saturated cryolite solution withdrawn from the bed and recycled. As shown in Fig. 1, cryolite crystals of 5 to 20 micron size are introduced from a hopper 5 into a crystallizer 1 through which a recirculated saturated cryolite solution is passed upwardly. Sodium aluminate solution is added to this cryolite solution from a vessel 3 and ammonium fluoride or hydrogen fluoride is passed directly to the crystallizer from a vessel 2. The cryolite crystals are fluidized in the crystallizer 1 and the agglomerates formed are withdrawn through line 7 whilst the supernatant cryolite solution passes through a vessel 6 and cooler 4 for recycle. Cryolite of composition from 5,5 NaF.2AIF3 to 6,87 NaF.2AIF3 may be obtained from sodium aluminate and hydrofluoric acid at pH 2 to 8, or from sodium fluoride and aluminium sulphate at pH 4 to 6, or from ammonium fluoride and sodium aluminate at pH 9,5 to 10,5.
GB32850/60A 1959-09-24 1960-09-23 Improvements in or relating to crystalline synthetic cryolite Expired GB900790A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR805954A FR76352E (en) 1959-09-24 1959-09-24 Process for agglomeration of crystals
FR826806A FR1264569A (en) 1960-05-11 1960-05-11 Synthetic Cryolite in Agglomerates

Publications (1)

Publication Number Publication Date
GB900790A true GB900790A (en) 1962-07-11

Family

ID=26184428

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32850/60A Expired GB900790A (en) 1959-09-24 1960-09-23 Improvements in or relating to crystalline synthetic cryolite

Country Status (4)

Country Link
BE (1) BE572827A (en)
FR (1) FR1187352A (en)
GB (1) GB900790A (en)
NL (1) NL112922C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000020335A1 (en) * 1998-10-05 2000-04-13 Riedel-De Haen Gmbh Method for the production of complex fluoroaluminate, the fluoroaluminate produced thereby and the utilization of spray drying and polyalkyleneglycols for controlling the structure of fluoroaluminates
WO2000032739A1 (en) * 1998-12-03 2000-06-08 Henkel Kommanditgesellschaft Auf Aktien Granulation method
US8628733B2 (en) 2008-11-07 2014-01-14 Areva Nc Method for preparing uranium concentrates by fluidized bed precipitation, and preparation of UO3 and U3O8 by drying/calcining said concentrates
CN115028182A (en) * 2022-06-23 2022-09-09 多氟多（昆明）科技开发有限公司 Production facility based on electrolytic aluminum fluorine-containing waste residue manufacturing and processing cryolite

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE665905A (en) * 1964-06-25
US3666406A (en) * 1969-09-01 1972-05-30 Showa Denko Kk Method for manufacturing cryolite with high purity
US3985862A (en) 1972-09-02 1976-10-12 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler Process for the production of sodium perborate
FR2443424A1 (en) * 1978-12-08 1980-07-04 Ugine Kuhlmann SODIUM URANATE
US4530699A (en) * 1979-01-18 1985-07-23 Aluminum Company Of America Dense phase precipitation
FR2508025A1 (en) * 1981-06-19 1982-12-24 Ugine Kuhlmann URANIUM PEROXIDE IN THE FORM OF SPHERICAL PARTICLES HAVING GOOD COLORABILITY AND PROCESS FOR OBTAINING THE SAME
FR2634048B1 (en) * 1988-07-11 1991-04-19 Pechiney Uranium PROCESS FOR THE MANUFACTURE OF NUCLEAR FUEL PELLETS COMPRISING THE PRODUCTION AND USE OF SINKING AND SINTERABLE POWDERS OBTAINED DIRECTLY BY PRECIPITATION OF PEROXIDES

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000020335A1 (en) * 1998-10-05 2000-04-13 Riedel-De Haen Gmbh Method for the production of complex fluoroaluminate, the fluoroaluminate produced thereby and the utilization of spray drying and polyalkyleneglycols for controlling the structure of fluoroaluminates
WO2000032739A1 (en) * 1998-12-03 2000-06-08 Henkel Kommanditgesellschaft Auf Aktien Granulation method
US8628733B2 (en) 2008-11-07 2014-01-14 Areva Nc Method for preparing uranium concentrates by fluidized bed precipitation, and preparation of UO3 and U3O8 by drying/calcining said concentrates
CN115028182A (en) * 2022-06-23 2022-09-09 多氟多（昆明）科技开发有限公司 Production facility based on electrolytic aluminum fluorine-containing waste residue manufacturing and processing cryolite
CN115028182B (en) * 2022-06-23 2022-11-25 多氟多（昆明）科技开发有限公司 Production facility based on electrolytic aluminum fluorine-containing waste residue manufacturing and processing cryolite

Also Published As

Publication number Publication date
FR1187352A (en) 1959-09-10
BE572827A (en) 1958-11-29
NL112922C (en) 1966-06-15

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