US5333558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of capturing and fixing volatile metal and metal oxides in an incineration process
Assignee: Metso Outotec USA Inc
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Filing: 1992-12-07
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Granted: 1994-08-02
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Expires: 2012-12-07
Abstract
Abstract A thermal treatment system for converting contaminants in soil to non-hazardous compounds. The system includes a combustion chamber in which the soils to be treated are heated to a temperature above the volatilization temperature of the contaminants in the soil. Reagents are injected into the gas stream above the soil which contains the volatized contaminants to interact with the inorganic contaminants to form solid particles that can be collected on a filter for safe disposal. The volatized organic contaminants are burned to form non-toxic combustion gases.
Inventors
- 👤 John N. Lees, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:16
CPC Classifications
F; F23; F23J; F23J7/00; B; B09; B09C; B09C1/00; B09C1/06; F23G; F23G5/00; F23G5/006; F23G7/00; F23G7/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
The process for removing hazardous material from a contaminated feed in an incineration system consisting of: a combustion chamber, a cooler, a filter, and a fan for causing gas to flow from said chamber through said cooler and then through said filter before being discharged to atmosphere. Said process comprising: feeding material containing both organic and inorganic contaminants into said chamber heating said material with a combustion gas to above the volatilization temperature of said contaminants to transform said contaminants into a gas which mixes with the combustion gas maintaining the temperature of the combustion gas in said chamber to above the burning temperature of said organic contaminants injecting finely powdered reagents into the combustion gas containing said volatized contaminants above the material in said chamber to interact with said volatized inorganic contaminants to form solid particles cooling said combustion gas capturing said particles in said filter for disposal discharging said purified gas to atmosphere.
Claim 2
Dependent Claim
155 words
The process for removing hazardous material from a contaminated feed in an incineration system consisting of: a combustion chamber, a cooler, a filter, and a fan for causing gas to flow from said chamber through said cooler and then through said filter before being discharged to atmosphere. Said process comprising: feeding material containing both organic and inorganic contaminants into said chamber heating said material with a combustion gas to above the volatilization temperature of said contaminants to transform said contaminants into a gas which mixes with the combustion gas maintaining the temperature of the combustion gas in said chamber to above the burning temperature of said organic contaminants injecting finely powdered reagents into the combustion gas containing said volatized contaminants above the material in said chamber to interact with said volatized inorganic contaminants to form solid particles cooling said combustion gas capturing said particles in said filter for disposal discharging said purified gas to atmosphere.
Claim 3
Dependent Claim
18 words
The process of claim 1 in which the reagents contain at least some Fe 2 O 3 .
Claim 4
Dependent Claim
14 words
The process of claim 1 in which the reagents contains at least some CaO.
Claim 5
Dependent Claim
14 words
The process of claim 1 in which the material contains at least some arsenic.
Claim 6
Dependent Claim
14 words
The process of claim 1 in which the material contains at least some lead.
Claim 7
Dependent Claim
54 words
The process of claim 1 in which a second combustion chamber is inserted between said first chamber and said cooler and the additional step of adding heat to said second chamber to elevate the temperature of the gas in said second chamber to enhance the burning of organic contaminants remaining in the gas stream.
Claim 8
Dependent Claim
31 words
The process of claim 1 in which the material also contains reagents which react with some of said inorganic contaminants to form non-volatile non-leachable compounds within the bed of said material.
Claim 9
Dependent Claim
14 words
The process of claim 1 in which said combustion chamber is a rotary kiln.
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) | 1997-08-01 | 1998-01-31 | 1998-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-01 | 2002-01-31 | 2002-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-01 | 2006-01-31 | 2006-08-02 | $7700.00 | Window Closed / Lapsed |