Patent US3754947A successfully refreshed from Google Patents.
US3754947A
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Lithium alumino silicate composition having low iron content
Assignee: First National City Bank
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Filing: 1970-08-10
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Granted: 1973-08-28
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Expires: 1990-08-10
Abstract
Abstract Lithium alumino silicate compositions having a low iron content, suitable for use in the glass and ceramic industries, are prepared by calcining a mixture of (a) a lithium alumino silicate-containing ore containing a high content of iron, such as spodumene, with (b) predetermined proportions of lithium carbonate or lithium hydroxide. Carbon dioxide is released and driven off where lithium carbonate is employed and water is released and driven off where lithium hydroxide is employed. The finished compositions have low contents of iron with weight ratios of Li2O to iron (calculated as Fe2O3) of the order of at least 50.
Inventors
- 👤 G Burkert
- 👤 H Uhland
- 👤 R Bach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:49
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; C01B33/26; C01B33/40; C01B33/46; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
20 words
The process of claim 1 in which the calcining temperature is in the range of about 700* to 800* C.
Claim 2
Dependent Claim
35 words
The process of claim 2 in which the lithium alumino silicate-containing ore and the lithium carbonate and/or lithium hydroxide have a mesh size the major proportions of which will pass through a 100 mesh screen.
Claim 3
Dependent Claim
29 words
The process of claim 2 in which the weight ratio, in the finished lithium alumino silicate composition, of the Li2O to the Fe2O3 is at least 50 to 1.
Claim 4
Dependent Claim
27 words
The process of claim 2 in which the weight ratio, in the finished lithium alumino silicate composition, of the Li2O to Na2O is at least about 13.
Claim 5
Dependent Claim
27 words
The process of claim 2 in which the weight ratio, in the finished lithium alumino silicate composition, of the Li2O to K2O is at least about 20.
Claim 6
Dependent Claim
42 words
The process of claim 2 in which the weight ratio, in the finished lithium alumino silicate composition, of the Li2O to Na2O and K2O is at least about 13 Li2O to 1 Na2O and at least about 20 Li2O to 1 K2O.
Claim 7
Dependent Claim
27 words
The process of claim 2 in which the starting lithium alumino silicate-containing ore is a spodumene containing from about 1.5 to about 7% by weight of Li2O.
Claim 8
Dependent Claim
148 words
A lithium alumino silicate composition containing from about 11.8 to about 29.4% Li2O and resulting from reacting, at a calcining temperature in the range of about 600* to about 925* C. , a mixture of (a) a lithium alumino silicate-containing ore, selected from the group consisting of spodumene, eucryptite, petalite and lepidolite, having an iron content calculated as Fe2O3 such that the weight ratio of the Li2O to Fe2O3 in said Ore is in the range of about 2.5 to 15 of Li2O to 1 of Fe2O3, with (b) at least one member of the group of lithium carbonate and lithium hydroxide in a proportion such as to react with at least most of the acidic oxides present in said (a) ore, whereby to produce a lithium alumino silicate composition in which the weight ratio of the Li2O to Fe2O3 is at least about 50 to 1 .
Claim 9
Dependent Claim
31 words
The lithium alumino silicate composition of claim 9 in which the weight ratio, in said finished lithium alumino silicate composition, of the Li2O to Na2 O is at least about 13.
Claim 10
Dependent Claim
30 words
The lithium alumino silicate composition of claim 9 in which the eight ratio, in said finished lithium alumino silicate composition, of the Li2O to K2O is at least about 20.
Claim 11
Dependent Claim
46 words
The lithium alumino silicate composition of claim 9 in whidh the weight ratio, in said finished lithium alumino silicate composition of the Li2O to Na2O and K2O is at least about 13 Li 2O to 1 Na2O and at least about 20 Li2O to 1 K2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |