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US4851129A
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Process for the detoxification of effluents from ore processing operations with hydrogen peroxide, using a magnetic pre-separation stage
Assignee: Evonik Operations GmbH
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Filing: 1988-04-19
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Granted: 1989-07-25
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Expires: 2008-04-19
Abstract
Abstract A process for treating effluents contaiing cyanide from mining operations wherein magnetic separation is used prior to treatment with hydrogen peroxide.
Inventors
- 👤 Andrew Griffiths
- 👤 Roy Norcross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:38
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/002; C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C22; C22B; C22B11/00; C22B11/08; C22B3/00; C22B3/20; C22B3/44; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
A method for detoxification of liquid effluents containing cyanide from ore processing operations comprising treatment of a pulp containing magnetic substances and obtained from an ore processing operation to magnetically separate from said pulp a significant proportion of the magnetic substances contained therein, and contacting the remaining material with sufficient hydrogen peroxide or hydrogen peroxide generating substance to react with the cyanide present in said material.
Claim 2
Independent Claim
66 words
A method for detoxification of liquid effluents containing cyanide from ore processing operations comprising treatment of a pulp containing magnetic substances and obtained from an ore processing operation to magnetically separate from said pulp a significant proportion of the magnetic substances contained therein, and contacting the remaining material with sufficient hydrogen peroxide or hydrogen peroxide generating substance to react with the cyanide present in said material.
Claim 3
Dependent Claim
35 words
The method in accordance with claim 1 wherein the magnetic substances are separated and subsequently treated with water to form a slurry which is permitted to settle in order to separate out the magnetic substances.
Claim 4
Dependent Claim
45 words
The method in accordance with claim 1 wherein the material from which the magnetic substances have been removed is sent to a plurality of detoxification zones wherein it is successively treated with hydrogen peroxide in a sufficient amount to react with the cyanide present therein.
Claim 5
Dependent Claim
53 words
The method in accordance with claim 1 wherein the magnetic substances after separation from the cyanide containing liquid effluent are washed with water to remove any cyanide adhering to said magnetic substances and the cyanide containing water is returned to the main stream of cyanide containing material, which is treated with hydrogen peroxide.
References Cited (Backward Citations)
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Cited
JPS5420466A
Cited
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Cited
US4416786A
Cited
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Cited
US4510254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |