US4270944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing calcium borates
Assignee: Owens Corning Fiberglas Technology Inc
•
Filing: 1980-01-11
•
Granted: 1981-06-02
•
Expires: 2000-01-11
Abstract
Abstract A process where calcium borates are precipitated from an aqueous solution of ulexite is disclosed. The ulexite is dissolved in hydrochloric acid. Calcium chloride then is added to the acid solution and then neutralized to precipitate the calcium borates. The calcium borates so produced are useful as glass forming, batch ingredients that can be compacted into agglomerates and preheated.
Inventors
- 👤 Walter L. Eastes
- 👤 Anna Tarantino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:29
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/08; C01B35/10; C01B35/12; C01B35/126; C03; C03C; C03C1/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
32 words
A method for producing calcium borates comprising the steps of: forming an aqueous solution of ulexite and mineral acid; adding calcium chloride; and neutralizing the acid solution to precipitate the calcium borates.
Claim 2
Independent Claim
32 words
A method for producing calcium borates comprising the steps of: forming an aqueous solution of ulexite and mineral acid; adding calcium chloride; and neutralizing the acid solution to precipitate the calcium borates.
Claim 3
Dependent Claim
22 words
A method according to claim 1 wherein the neutralizing is carried out by adjusting the pH to range between 7 and 9.
Claim 4
Independent Claim
15 words
A method according to claims 1 or 2 including the step of drying the precipitate.
Claim 5
Dependent Claim
35 words
A method according to claim 1 wherein the calcium chloride calculated as Ca and the ulexite calculated as B are present in initial amounts having a molar ratio of Ca/B ranging from 0.10 to 1.0.
Claim 6
Dependent Claim
16 words
A method according to claim 4 wherein the ratio of Ca/B ranges from 0.1 to 0.4.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein the mineral acid has a concentration ranging from 0.2 to 3.0 M.
Claim 8
Dependent Claim
19 words
A method according to claim 1 wherein the mineral acid has a concentration ranging from 0.3 to 2.0 M.
Claim 9
Dependent Claim
16 words
A method according to claim 1 wherein the mineral acid has a concentration of 0.5 M.
Claim 10
Dependent Claim
15 words
A method according to claim 2 wherein the pH is adjusted with a NaOH solution.
Claim 11
Dependent Claim
19 words
A method according to claim 3 wherein the precipitate is dried at 110° C. for 2 to 3 hours.
Claim 12
Dependent Claim
13 words
A method according to claim 1 wherein the mineral acid is hydrochloric acid.
Claim 13
Independent Claim
86 words
A method for preparing a calcium borate-containing glass fiber forming glass batch comprising introducing calcium borate-containing batch ingredients into a compacting zone, compacting the ingredients with sufficient water to produce agglomerates containing 5% to 20% by weight of water, and heating the agglomerates to a temperature and for a time sufficient to melt or fuse the agglomerates; wherein the calcium borate is prepared by forming an aqueous solution of ulexite and hydrochloric acid; adding calcium chloride; and neutralizing the acid solution to precipitate the calcium borates.
Claim 14
Independent Claim
86 words
A method for preparing a calcium borate-containing glass fiber forming glass batch comprising introducing calcium borate-containing batch ingredients into a compacting zone, compacting the ingredients with sufficient water to produce agglomerates containing 5% to 20% by weight of water, and heating the agglomerates to a temperature and for a time sufficient to melt or fuse the agglomerates; wherein the calcium borate is prepared by forming an aqueous solution of ulexite and hydrochloric acid; adding calcium chloride; and neutralizing the acid solution to precipitate the calcium borates.
Claim 15
Dependent Claim
21 words
A process according to claim 12 including the subsequent step of charging the agglomerated glass batch to a glass melting furnace.
References Cited (Backward Citations)
US1185216A
Cited
US1200739A
Cited
GB352137A
Cited
US2867502A
Cited
US3032391A
Cited
US3026178A
Cited
US3032392A
Cited
US3088801A
Cited
US3450497A
Cited
US4074991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |