US3835217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery or dissolved mercury salts from aqueous solutions
Assignee: PPG Industries Inc
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Filing: 1972-06-01
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Granted: 1974-09-10
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Expires: 1992-06-01
Abstract
Abstract A process for the recovery of mercury sulfide from an aqueous solution comprising intermixing with said solution a flocculating compound of the formula:
Inventors
- 👤 L Dunsmoor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:42
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/32; C01D3/00; C01D3/14; C01D3/16; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912; Y10S210/914
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
The method of claim 1 wherein the flocculant is magnesium chloride and the pH of the solution is adjusted to between 9 and 13.
Claim 2
Dependent Claim
25 words
The method of claim 1 wherein the flocculant is an aluminum salt and the pH of the solution is adjusted to between 4 and 8.
Claim 3
Dependent Claim
67 words
The method of claim 1 wherein the sulfur compound and the flocculant are added to the brine from a single solution having a ratio of sulfide ion to flocculant of from 1:1 to 1:4, the pH of the brine is first maintained between 4 and 8, and the pH of the brine is then adjusted to a pH where the flocculant is converted to an insoluble hydroxide.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |