US4226630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leach-resistant solid bodies from fly ash and heavy metal sludge
Assignee: AMAX ENVIRONMENTAL SERVICES Inc
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Filing: 1979-04-03
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Granted: 1980-10-07
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Expires: 1999-04-03
Abstract
Abstract Solid, leach-resistant bodies are formed from aqueous heavy metal sludge and fly ash formed in the combustion of subbituminous coal from the Power River Basin by slurrying the sludge with an amount of fly ash equivalent to between about 20 wt. % and about 70 wt. % based on the weight of the slurry, wherein the initial liquid content of the slurry is such that the slurry will harden into a body having a 7-day compressive strength of at least about 250 psi, and allowing the slurry to harden.
Inventors
- 👤 Robert W. Styron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:25
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/0463; C04B18/0472; C04B28/00; C04B28/02; C04B28/021; C04B28/18; C04B7/00; C04B7/24; Y; Y02; Y02P; Y02P40/00; Y02P40/10; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/01
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
113 words
A process of treating an aqueous sludge containing at least one heavy metal species selected from the group consisting of tungsten, cadmium, chromium, strontium, copper, iron, lead, nickel, zinc, molybdenum, tin, magnesium, aluminum, phosphorus, and manganese, to form a solid leach-resistant body, comprising forming a slurry consisting of said sludge, fly ash formed in the combustion of sub-bituminous coal from the Powder River Basin wherein said fly ash is present in an amount effective to form a slurry which will harden into a solid, leach-resistant body, and an initial water content such that the body will have a 7-day compressive strength of at least about 250 psi, and allowing the slurry to harden.
Claim 2
Dependent Claim
113 words
A process of treating an aqueous sludge containing at least one heavy metal species selected from the group consisting of tungsten, cadmium, chromium, strontium, copper, iron, lead, nickel, zinc, molybdenum, tin, magnesium, aluminum, phosphorus, and manganese, to form a solid leach-resistant body, comprising forming a slurry consisting of said sludge, fly ash formed in the combustion of sub-bituminous coal from the Powder River Basin wherein said fly ash is present in an amount effective to form a slurry which will harden into a solid, leach-resistant body, and an initial water content such that the body will have a 7-day compressive strength of at least about 250 psi, and allowing the slurry to harden.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said solid, leach-resistant body has a 28-day compressive strength of at least about 400 psi.
Claim 4
Dependent Claim
22 words
The process of claim 1 or claim 2 wherein said body has a 7-day compressive strength of at least about 1500 psi.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein said body has a 28-day compressive strength of at least about 2500 psi.
Claim 6
Dependent Claim
33 words
The process of claim 1 or claim 2 wherein the amount of said fly ash added to said sludge comprises between about 10 and about 70 percent of the weight of said slurry.
Claim 7
Dependent Claim
30 words
The process of claim 5 wherein the amount of said fly ash added to said sludge comprises between about 40 and about 60 percent of the weight of said slurry.
Claim 8
Dependent Claim
30 words
The process of claim 3 wherein the amount of said fly ash added to said sludge comprises between about 10 and about 70 percent of the weight of said slurry.
Claim 9
Dependent Claim
30 words
The process of claim 7 wherein the amount of said fly ash added to said sludge comprises between about 40 and about 60 percent of the weight of said slurry.
Claim 10
Dependent Claim
30 words
The process of claim 4 wherein the amount of said fly ash added to said sludge comprises between about 10 and about 70 percent of the weight of said slurry.
Claim 11
Dependent Claim
30 words
The process of claim 9 wherein the amount of said fly ash added to said sludge comprises between about 40 and about 60 percent of the weight of said slurry.
Claim 12
Dependent Claim
30 words
The process of claim 1 or claim 2 wherein the initial liquid content of said slurry comprises between about 10 and about 30 percent of the weight of said slurry.
Claim 13
Dependent Claim
27 words
The process of claim 3 wherein the initial liquid content of said slurry comprises between about 10 and about 30 percent of the weight of said slurry.
Claim 14
Dependent Claim
27 words
The process of claim 4 wherein the initial liquid content of said slurry comprises between about 10 and about 30 percent of the weight of said slurry.
Claim 15
Dependent Claim
16 words
A solid, leach-resistant body made in accordance with the process of claim 1 or claim 2.
Claim 16
Dependent Claim
13 words
A solid, leach-resistant body made in accordance with the process of claim 5.
Claim 17
Dependent Claim
10 words
A solid, leach-resistant body prepared in accordance with claim 11.
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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |