GB1292017A – Improvements in or relating to the purification of crystallizable material by directional freezing
– Google Patents
GB1292017A – Improvements in or relating to the purification of crystallizable material by directional freezing
– Google Patents
Improvements in or relating to the purification of crystallizable material by directional freezing
Info
Publication number
GB1292017A
GB1292017A
GB23259/71A
GB2325971A
GB1292017A
GB 1292017 A
GB1292017 A
GB 1292017A
GB 23259/71 A
GB23259/71 A
GB 23259/71A
GB 2325971 A
GB2325971 A
GB 2325971A
GB 1292017 A
GB1292017 A
GB 1292017A
Authority
GB
United Kingdom
Prior art keywords
purification
interface
heaters
gravity
centrifugal acceleration
Prior art date
1970-03-05
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
GB23259/71A
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.)
South African Inventions Development Corp
Original Assignee
South African Inventions Development Corp
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.)
1970-03-05
Filing date
1971-04-19
Publication date
1972-10-11
1971-04-19
Application filed by South African Inventions Development Corp
filed
Critical
South African Inventions Development Corp
1972-10-11
Publication of GB1292017A
publication
Critical
patent/GB1292017A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
C—CHEMISTRY; METALLURGY
C30—CRYSTAL GROWTH
C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
C30B11/008—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method using centrifugal force to the charge
Abstract
1292017 Directional crystallization SOUTH AFRICAN INVENTIONS DEVELOPMENT CORP 19 April 1971 [5 March 1970] 23259/ 71 Heading B1S In order to produce a high degree of purification, with a rapid rate of travel of the solidliquid interface, in progressive freezing, the interface travels transversely to the direction of a centrifugal acceleration greater than that of gravity and to the direction of a thermallyinduced convective flow of molten material Molten naphthalene 11 may be subjected to a centrifugal acceleration from 10 to 400 times that of gravity and, on switching off heaters 9 and 10, allowed to solidify in contact with annular plates 3, 4, while heaters 16 and 20 remain energised. Heater 20 produces a convective flow in the directions of arrows C, D parallel to solid-liquid interface 17. The impurities collect in the central molten material and this is drained off to give a yield of about 80% of the purer material
GB23259/71A
1970-03-05
1971-04-19
Improvements in or relating to the purification of crystallizable material by directional freezing
Expired
GB1292017A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
ZA701496A
ZA701496B
(en)
1970-03-05
1970-03-05
Improvements in or relating to the purification of crystallizable material by directional freezing
Publications (1)
Publication Number
Publication Date
GB1292017A
true
GB1292017A
(en)
1972-10-11
Family
ID=25561771
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB23259/71A
Expired
GB1292017A
(en)
1970-03-05
1971-04-19
Improvements in or relating to the purification of crystallizable material by directional freezing
Country Status (3)
Country
Link
US
(1)
US3715892A
(en)
GB
(1)
GB1292017A
(en)
ZA
(1)
ZA701496B
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1990002221A1
(en)
*
1988-08-17
1990-03-08
Battelle Memorial Institute
Cristallization in a gravitational force field
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4240495A
(en)
*
1978-04-17
1980-12-23
General Motors Corporation
Method of making cast metal turbine wheel with integral radial columnar grain blades and equiaxed grain disc
DE3644746A1
(en)
*
1986-12-30
1988-07-14
Hagen Hans Dr Ing
Process and apparatus for growing crystals
1970
1970-03-05
ZA
ZA701496A
patent/ZA701496B/en
unknown
1971
1971-02-22
US
US00117622A
patent/US3715892A/en
not_active
Expired – Lifetime
1971-04-19
GB
GB23259/71A
patent/GB1292017A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1990002221A1
(en)
*
1988-08-17
1990-03-08
Battelle Memorial Institute
Cristallization in a gravitational force field
US5093095A
(en)
*
1988-08-17
1992-03-03
Battelle Memorial Institute
Crystallization in a force field
Also Published As
Publication number
Publication date
US3715892A
(en)
1973-02-13
ZA701496B
(en)
1971-07-28
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Legal Events
Date
Code
Title
Description
1973-02-21
PS
Patent sealed [section 19, patents act 1949]
1980-12-03
PCNP
Patent ceased through non-payment of renewal fee
