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US3265492A
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Method of utilizing electrolytic cell sludge by recovering calcium metal thereform
Assignee: Dow Chemical Co
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Filing: 1963-09-03
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Granted: 1966-08-09
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Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 Paul R Juckniess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B7/00; C22B7/001; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD OF UTILIZING ELECTROLYTIC SODIUM CELL SLUDGE WHICH COMPRISES: (1) PROVIDING A SODIUM AND CALCIUMCONTAINING SLUDGE FROM AN ELECTROLYTIC CELL; (2) MELTING AND MIXING SAID SLUDGE UNDER AN INERT ATMOSPHERE AND AT A MAXIMUM TEMPERATURE OF ABOUT 800 DEGREES CENTIGRADE, WITH (A) AT LEAST 3 PARTS BY WEIGHT OF CALCIUM CHLORIDE PER PART OF SLUDGE, AND (B) SUFFICIENT ALLOYING METAL SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, LEAD, ZINC, ALUMINUM, AND MAGNESIUM, TO PRODUCE A CALCIUM ALLOY CONTAINING (ON A SODIUM-FREE BASIS) FROM ABOUT ONE TO ABOUT NINETY-FIVE WEIGHT PERCENT CALCIUM AND FROM ABOUT NINETY-NINE TO ABOUT FIVE PERCENT ALLOYING METAL, AND UP TO NINE WEIGHT PERCENT RESIDUAL SODIUM; AND (3) SEPARATING SAID CALCIUM-ALLOYING METAL ALLOY FROM THE RESULTING MIXTURE.
Claim 2
Independent Claim
122 words
A METHOD OF UTILIZING ELECTROLYTIC SODIUM CELL SLUDGE WHICH COMPRISES: (1) PROVIDING A SODIUM AND CALCIUMCONTAINING SLUDGE FROM AN ELECTROLYTIC CELL; (2) MELTING AND MIXING SAID SLUDGE UNDER AN INERT ATMOSPHERE AND AT A MAXIMUM TEMPERATURE OF ABOUT 800 DEGREES CENTIGRADE, WITH (A) AT LEAST 3 PARTS BY WEIGHT OF CALCIUM CHLORIDE PER PART OF SLUDGE, AND (B) SUFFICIENT ALLOYING METAL SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, LEAD, ZINC, ALUMINUM, AND MAGNESIUM, TO PRODUCE A CALCIUM ALLOY CONTAINING (ON A SODIUM-FREE BASIS) FROM ABOUT ONE TO ABOUT NINETY-FIVE WEIGHT PERCENT CALCIUM AND FROM ABOUT NINETY-NINE TO ABOUT FIVE PERCENT ALLOYING METAL, AND UP TO NINE WEIGHT PERCENT RESIDUAL SODIUM; AND (3) SEPARATING SAID CALCIUM-ALLOYING METAL ALLOY FROM THE RESULTING MIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |