US4850290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for energy recovery from solid hazardous waste
Assignee: Nissan Motor Co Ltd
•
Filing: 1988-11-23
•
Granted: 1989-07-25
•
Expires: 2008-11-23
Abstract
Abstract A method is described for environmentally sound usage of combustible hazardous waste in an operating rotary kiln. The method is particularly adapted for disposal of solid hazardous wastes, optionally in the form of a blended waste homogenate, packaged in sealable containers. The containers are used as fuel modules and charged into a rotary kiln cylinder where kiln gas temperatures range from about 950° to about 1200° C. to achieve high destruction and removal efficiencies.
Inventors
- 👤 Michel R. Benoit
- 👤 Eric R. Hansen
- 👤 Theodore J. Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:27
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/34; C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/44; C04B7/4407; C04B7/4438; F23; F23G; F23G5/00; F23G5/08; F23G5/20; F23G5/44; F23G5/442; F23G5/448; F27B7/32; F23G2203/00; F23G2203/20; F23G2203/206; F23G2206/00; F23G2206/20; F23G2206/201; F27B7/3205; F27B2007/3247; F27D; F27D99/00; F27D99/0001; F27D99/0033; F27D2099/0051; Y; Y02; Y02E; Y02E20/00; Y02E20/30; Y02P; Y02P40/00; Y02P40/10; Y02P40/125
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
74 words
A method for achieving environmentally sound disposal of hazardous waste in an operating rotary kiln comprising a heated, rotating cylinder containing in-process mineral material, said method comprising the steps of packaging said hazardous waste in containers and charging the containerized hazardous waste into the kiln to contact the mineral material at a point along the length of the kiln cylinder where the kiln gas temperature ranges from about 950° C. to about 1200° C.
Claim 2
Independent Claim
74 words
A method for achieving environmentally sound disposal of hazardous waste in an operating rotary kiln comprising a heated, rotating cylinder containing in-process mineral material, said method comprising the steps of packaging said hazardous waste in containers and charging the containerized hazardous waste into the kiln to contact the mineral material at a point along the length of the kiln cylinder where the kiln gas temperature ranges from about 950° C. to about 1200° C.
Claim 3
Dependent Claim
49 words
The method of claim 1 wherein the rotary kiln is a conventional long dry or wet process rotary cement kiln fired at its discharge end and the containerized hazardous waste is charged into the kiln cylinder at a point along the middle axial one-third portion of the kiln cylinder.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the containerized hazardous waste is charged through a port in the kiln cylinder wall.
Claim 5
Dependent Claim
71 words
The method of claim 1 wherein the operating rotary kiln is a preheater or precalciner type rotary kiln having a preheater portion upstream from a rotating kiln cylinder having an upper end for receiving preheated mineral material from the preheater portion and a fired lower end where mineral material is discharged from the kiln, and wherein the containerized hazardous waste is charged directly into the upper end of the kiln cylinder.
Claim 6
Dependent Claim
20 words
The method of claim 4 wherein the containerized hazardous waste is charged through a port in the kiln cylinder wall.
Claim 7
Dependent Claim
25 words
The method of claim 1 further comprising the step of blending the hazardous wastes to form a hazardous waste homogenate for packaging in said containers.
Claim 8
Dependent Claim
33 words
The method of claim 1 wherein the packaging of the hazardous waste is carried out so that each container of hazardous waste has an energy value content within a predetermined energy value range.
Claim 9
Dependent Claim
14 words
The method of claim 7 wherein the hazardous waste is sealed in metal containers.
Claim 10
Dependent Claim
25 words
The method of claim 8 further comprising the step of blending the hazardous wastes to form a hazardous waste homogenate for packaging in said containers.
Claim 11
Dependent Claim
24 words
The method of claim 9 wherein the kiln gas temperature at the point of charging ranges from about 950° C. to about 1100° C.
Claim 12
Dependent Claim
19 words
The method of claim 9 wherein the containerized waste is charged through a port in the kiln cylinder wall.
Claim 13
Dependent Claim
32 words
The method of claim 1 wherein the containerized hazardous waste is charged into the kiln at a point where the kiln gas temperature ranges from about 950° C. to about 1100° C.
Claim 14
Dependent Claim
20 words
The method of claim 12 wherein the containerized hazardous waste is charged through a port in the kiln cylinder wall.
Claim 15
Dependent Claim
25 words
The method of claim 13 further comprising the step of blending the hazardous wastes to form a hazardous waste homogenate for packaging in said containers.
Claim 16
Dependent Claim
75 words
An improved method for recovery of energy values from hazardous wastes in an operating rotary kiln comprising a heated, rotating cylinder containing mineral material, said method comprising the steps of packaging said hazardous waste in sealable containers and charging the containerized hazardous waste into the kiln to contact the mineral material at a point along the length of the kiln cylinder where the kiln gas temperature ranges from about 950° C. to about 1200° C.
Claim 17
Dependent Claim
75 words
An improved method for recovery of energy values from hazardous wastes in an operating rotary kiln comprising a heated, rotating cylinder containing mineral material, said method comprising the steps of packaging said hazardous waste in sealable containers and charging the containerized hazardous waste into the kiln to contact the mineral material at a point along the length of the kiln cylinder where the kiln gas temperature ranges from about 950° C. to about 1200° C.
Claim 18
Dependent Claim
49 words
The method of claim 15 wherein the rotary kiln is a conventional long dry or wet process rotary cement kiln fired at its discharge end and the containerized hazardous waste is charged into the kiln cylinder at a point along the middle axial one-third portion of the kiln cylinder.
Claim 19
Dependent Claim
20 words
The method of claim 16 wherein the containerized hazardous waste is charged through a port in the kiln cylinder wall.
Claim 20
Dependent Claim
71 words
The method of claim 15 wherein the operating rotary kiln is a preheater or precalciner type rotary kiln having a preheater portion upstream from a rotating kiln cylinder having an upper end for receiving preheated mineral material from the preheater portion and a fired lower end where mineral material is discharged from the kiln, and wherein the containerized hazardous waste is charged directly into the upper end of the kiln cylinder.
Claim 21
Dependent Claim
25 words
The method of claim 15 further comprising the step of blending the hazardous wastes to form a hazardous waste homogenate for packaging in said containers.
Claim 22
Dependent Claim
33 words
The method of claim 15 wherein the packaging of the hazardous waste is carried out so that each container of hazardous waste has an energy value content within a predetermined energy value range.
References Cited (Backward Citations)
US3572524A
Cited
US3986624A
Cited
US3987916A
Cited
US3925091A
Cited
US4022629A
Cited
US3822651A
Cited
US4081285A
Cited
US4374704A
Cited
US4315712A
Cited
US4295823A
Cited
US4238237A
Cited
US4318713A
Cited
US4419943A
Cited
US4389242A
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 |