US4142912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Landfill material
Assignee: Union Oil Company of California
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Filing: 1978-07-17
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Granted: 1979-03-06
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Expires: 1998-07-17
Abstract
Abstract A method for treating arsenic-containing waste materials for disposal in landfill sites comprises admixing an arsenic waste, Portland cement, sand, one or more water-soluble manganese or alkaline earth metal salts, and water, thereby producing a slurry similar to wet concrete, which slurry, when cured, leaves a rock-like material containing entrapped arsenic. This material may be used for landfill without danger of ground or rain waters leaching arsenic therefrom.
Inventors
- 👤 Dean A. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:07
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/0463; C04B22/00; C04B22/08; C04B24/00; C04B24/04; C04B28/00; C04B28/02; C04B28/04; C04B2103/00; C04B2103/0004; C04B2111/00; C04B2111/00474; C04B2111/00767; C04B2111/00784; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912; Y10S588/00; Y10S588/901
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
191 words
A process for treating an arsenic-containing waste to produce an arsenic-containing landfill material essentially completely impervious to the arsenic-leaching effects of ground or rain waters, which process comprises: (a) admixing said arsenic-containing waste with (1) sufficient of one or more additive components selected from the group consisting of those alkaline earth metal and manganese compounds soluble in water at 25° C. to the extent of at least 100 grams per liter such that said one or more additive components are present in a total mole ratio to arsenic of between about 1 and 10, calculated as the total moles of alkaline earth and manganese metals in said one or more additive components to the total moles of arsenic in said arsenic-containing waste and (2) a setting agent comprising Portland cement and sand, said admixing being accomplished in the presence of sufficient water and with sufficient of said setting agent to produce a mixed material having the consistency of wet concrete; (b) curing the mixed material under conditions sufficient to cause solidification; and (c) recovering a rock-like aggregate essentially completely impervious to the leaching of arsenic therefrom by ground or rain waters.
Claim 2
Dependent Claim
191 words
A process for treating an arsenic-containing waste to produce an arsenic-containing landfill material essentially completely impervious to the arsenic-leaching effects of ground or rain waters, which process comprises: (a) admixing said arsenic-containing waste with (1) sufficient of one or more additive components selected from the group consisting of those alkaline earth metal and manganese compounds soluble in water at 25° C. to the extent of at least 100 grams per liter such that said one or more additive components are present in a total mole ratio to arsenic of between about 1 and 10, calculated as the total moles of alkaline earth and manganese metals in said one or more additive components to the total moles of arsenic in said arsenic-containing waste and (2) a setting agent comprising Portland cement and sand, said admixing being accomplished in the presence of sufficient water and with sufficient of said setting agent to produce a mixed material having the consistency of wet concrete; (b) curing the mixed material under conditions sufficient to cause solidification; and (c) recovering a rock-like aggregate essentially completely impervious to the leaching of arsenic therefrom by ground or rain waters.
Claim 3
Dependent Claim
29 words
A process as defined in claim 1 wherein said additive components are selected from the group consisting of calcium chloride, magnesium chloride, manganese chloride, magnesium sulfate, and magnesium acetate.
Claim 4
Dependent Claim
19 words
A process as defined in claim 1 wherein said arsenic-containing waste contains at least one weight percent arsenic components.
Claim 5
Dependent Claim
37 words
A process as defined in claim 3 wherein the aggregate recovered in step (c) has a volume to surface ratio above 1 ft 3 :10 ft 2 and a volume of at least 0.1 ft 3 .
Claim 6
Dependent Claim
21 words
A process as defined in claim 1 wherein said arsenic waste is a catalytic absorbent containing arsenic removed from shale oil.
Claim 7
Dependent Claim
99 words
A landfill material comprising a rock-like aggregate obtained by curing under conditions sufficient to cause solidification a mixture consisting essentially of an arsenic-containing waste, a setting agent comprising Portland cement and sand, water, and one or more additive components selected from the group consisting of those manganese and alkaline earth metal compounds soluble in water at 25° C. to the extent of at least 100 grams per liter, said landfill material being substantially more impervious to the arsenic-leaching effects of ground or rain waters than if said one or more additive components had not been present in said mixture.
Claim 8
Dependent Claim
99 words
A landfill material comprising a rock-like aggregate obtained by curing under conditions sufficient to cause solidification a mixture consisting essentially of an arsenic-containing waste, a setting agent comprising Portland cement and sand, water, and one or more additive components selected from the group consisting of those manganese and alkaline earth metal compounds soluble in water at 25° C. to the extent of at least 100 grams per liter, said landfill material being substantially more impervious to the arsenic-leaching effects of ground or rain waters than if said one or more additive components had not been present in said mixture.
Claim 9
Dependent Claim
30 words
A landfill material as defined in claim 6 wherein said additive components are selected from the class consisting of calcium chloride, magnesium chloride, manganese chloride, magnesium sulfate, and magnesium acetate.
Claim 10
Dependent Claim
20 words
A landfill material as defined in claim 6 wherein said arsenic-containing waste contains at least one weight percent arsenic components.
Claim 11
Dependent Claim
42 words
A landfill material as defined in claim 8 wherein the landfill material is in the form of an aggregate having a volume to surface ratio above 1 ft 3 :10 ft 2 and a volume of at least 0.1 ft 3 .
Claim 12
Dependent Claim
70 words
A landfill material as defined in claim 9 wherein said mixture contains sufficient of said one or more additive components such that said alkaline earth metal and manganese compounds are present in a total mole ratio to arsenic components, calculated as the total moles of alkaline earth and manganese metals in said additive components to the total moles of arsenic in said arsenic components, of between about 1 and 10.
Claim 13
Dependent Claim
22 words
A landfill material as defined in claim 10 wherein said arsenic waste is a catalytic absorbent containing arsenic removed from shale oil.
Claim 14
Dependent Claim
184 words
A process for treating an arsenic-containing waste to produce an arsenic-containing landfill material essentially impervious to the arsenic-leaching effects of ground or rain waters, which process comprises: (a) admixing said arsenic-containing waste with a setting agent comprising Portland cement and sand such that the resulting composition contains between about 0.1 and 25 wt.% of said arsenic-containing waste, between about 20 and 70 wt.% of Portland cement, and between about 35 and 85 wt.% of sand, and further admixing said resulting composition with (1) one or more additive components selected from the group consisting of those alkaline earth metal and manganese compounds soluble in water at 25° C. to the extent of at least 100 grams per liter and (2) sufficient water to dissolve said one or more additive components and produce a mixed material having the consistency of wet concrete; (b) curing the mixed materials under conditions sufficient to cause solidification; and (c) recovering a rock-like aggregate substantially more impervious to the leaching effects of arsenic therefrom by ground or rain waters than if said one or more additive components had not been present.
Claim 15
Dependent Claim
184 words
A process for treating an arsenic-containing waste to produce an arsenic-containing landfill material essentially impervious to the arsenic-leaching effects of ground or rain waters, which process comprises: (a) admixing said arsenic-containing waste with a setting agent comprising Portland cement and sand such that the resulting composition contains between about 0.1 and 25 wt.% of said arsenic-containing waste, between about 20 and 70 wt.% of Portland cement, and between about 35 and 85 wt.% of sand, and further admixing said resulting composition with (1) one or more additive components selected from the group consisting of those alkaline earth metal and manganese compounds soluble in water at 25° C. to the extent of at least 100 grams per liter and (2) sufficient water to dissolve said one or more additive components and produce a mixed material having the consistency of wet concrete; (b) curing the mixed materials under conditions sufficient to cause solidification; and (c) recovering a rock-like aggregate substantially more impervious to the leaching effects of arsenic therefrom by ground or rain waters than if said one or more additive components had not been present.
Claim 16
Dependent Claim
40 words
A process as defined in claim 12 wherein said resulting composition contains between about 2 and 15 wt.% of arsenic-containing waste, between about 30 and 60 wt.% of said Portland cement, and between about 40 and 75 wt.% of sand.
Claim 17
Dependent Claim
29 words
A process as defined in claim 13 wherein said additive components are selected from the group consisting of calcium chloride, magnesium chloride, manganese chloride, magnesium sulfate, and magnesium acetate.
Claim 18
Dependent Claim
175 words
A rock-like landfill material produced by curing under conditions sufficient to cause solidification a mixture comprising (1) an admixture comprising between about 0.1 and 25 wt.% of an arsenic-containing waste, between about 20 and 70 wt.% of Portland cement, and between about 35 and 85 wt.% of sand, (2) sufficient of one or more additive components selected from the group consisting of those manganese and alkaline earth metal compounds soluble in water at 25° C. to the extent of at least 100 grams per liter such that said one or more additive components are present in a total mole ratio to arsenic of between about 1 and 10, calculated as the total moles of alkaline earth and manganese metals in said one or more additive components to the total moles of arsenic in said arsenic-containing waste, and (3) sufficient water to dissolve said one or more additive components and produce a mixed material having the consistency of wet concrete, said landfill material being essentially completely impervious to the arsenic-leaching effects of ground or rain waters.
Claim 19
Dependent Claim
175 words
A rock-like landfill material produced by curing under conditions sufficient to cause solidification a mixture comprising (1) an admixture comprising between about 0.1 and 25 wt.% of an arsenic-containing waste, between about 20 and 70 wt.% of Portland cement, and between about 35 and 85 wt.% of sand, (2) sufficient of one or more additive components selected from the group consisting of those manganese and alkaline earth metal compounds soluble in water at 25° C. to the extent of at least 100 grams per liter such that said one or more additive components are present in a total mole ratio to arsenic of between about 1 and 10, calculated as the total moles of alkaline earth and manganese metals in said one or more additive components to the total moles of arsenic in said arsenic-containing waste, and (3) sufficient water to dissolve said one or more additive components and produce a mixed material having the consistency of wet concrete, said landfill material being essentially completely impervious to the arsenic-leaching effects of ground or rain waters.
Claim 20
Dependent Claim
39 words
A landfill material as defined in claim 15 wherein said admixture comprises between about 2 and 15 wt.% of arsenic-containing waste, between about 30 and 60 wt.% of Portland cement, and between about 40 and 75 wt.% of sand.
Claim 21
Dependent Claim
30 words
A landfill material as defined in claim 15 wherein said additive components are selected from the group consisting of calcium chloride, magnesium chloride, manganese chloride, magnesium sulfate, and magnesium acetate.
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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |