US3989623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of dissolved mercury salts from aqueous solutions
Assignee: Georgia-Pacific LLC
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Filing: 1975-09-08
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Granted: 1976-11-02
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Expires: 1995-09-08
Abstract
Abstract A process for recovery of dissolved mercury salts from aqueous solution is described which involves precipitating the mercury as mercury sulfide and contacting the solution with zinc sulfide particles.
Inventors
- 👤 John A. Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
C; C22; C22B; C22B43/00; C01; C01G; C01G13/00; C02; C02F; C02F1/00; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A process for removing mercury from an aqueous solution containing dissolved mercury salts which comprises, treating the solution with a water-soluble sulfide compound to react mercury with the sulfide ion to form a mercury sulfide precipitate, contacting the solution containing the mercury sulfide precipitate with zinc sulfide particles at a pH in the range of 3 to 8.5 to remove the mercury sulfide from the solution.
Claim 2
Dependent Claim
66 words
A process for removing mercury from an aqueous solution containing dissolved mercury salts which comprises, treating the solution with a water-soluble sulfide compound to react mercury with the sulfide ion to form a mercury sulfide precipitate, contacting the solution containing the mercury sulfide precipitate with zinc sulfide particles at a pH in the range of 3 to 8.5 to remove the mercury sulfide from the solution.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein the pH is in the range of 4 to 6.
Claim 4
Dependent Claim
37 words
A process according to claim 2 wherein the solution is contacted with zinc sulfide particles by intermixing the zinc sulfide particles with the solution, and removing the mercury sulfide with the zinc sulfide particles from the solution.
Claim 5
Dependent Claim
28 words
A process according to claim 2 wherein the solution is contacted with the zinc sulfide particles by passing the solution through a filter medium containing zinc sulfide particles.
Claim 6
Dependent Claim
22 words
A process according to claim 2 wherein an aqueous solution containing the dissolved mercury salt is a mercury cathode electrolytic cell effluent.
Claim 7
Dependent Claim
22 words
A process according to claim 5 wherein the mercury cathode electrolytic cell effluent has an ionic strength of less than 1 molar.
Claim 8
Dependent Claim
25 words
A process according to claim 6 wherein the ionic strength of the mercury cathode cell effluent is in the range of 0.005 to 0.1 molar.
Claim 9
Dependent Claim
39 words
A process according to claim 7 wherein the mercury sulfide is contacted with the zinc sulfide particles by intermixing the zinc sulfide particles with the effluent, and removing the mercury sulfide with the zinc sulfide particles from the effluent.
Claim 10
Dependent Claim
36 words
A process according to claim 7 wherein the mercury sulfide is contacted with the zinc sulfide particles by passing the effluent stream containing the mercury sulfide through a filter medium having dispersed therein zinc sulfide particles.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |