US4124405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for solidifying aqueous wastes and products thereof
Assignee: Pec-Engineering SA
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Filing: 1976-08-02
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Granted: 1978-11-07
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Expires: 1996-08-02
Abstract
Abstract The water-soluble pollutants contained in aqueous industrial, agricultural and domestic waste materials are converted into a water-insoluble solid mass with improved resistance to leaching of the pollutants therefrom by treatment with a particulate metallurgical slag under alkaline conditions, in the presence of a hydration-promoting agent for the slag, e.g., gypsum.
Inventors
- 👤 Jean Quienot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:21
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C04; C04B; C04B18/00; C04B18/02; C04B18/021; C04B28/00; C04B28/02; C04B28/08; C05; C05B; C05B5/00; C21B2400/00; C21B2400/02; C21B2400/022; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
In a process for the treatment of solidifiable aqueous wastes containing water-soluble environmental pollutants with a sufficient quantity of setting agent which converts the pollutants into a water-insoluble mass, the improvement which comprises treating the aqueous waste in a homogeneous condition, employing as the setting agent a particulate water-insoluble slag from metal refining, in the presence of a slag hydration-promoting combination of, sulfate and alkali metal ions and wherein 100 parts of starting waste are mixed with 5 to 35 parts of said slag, 0.02 to 15 parts of alkaline agent, 0.2 to 30 parts of said hydration-promoting combination, 0 to 2 parts of emulsifying agent and 0 to 150 parts of pozzolana, fly ash or clinker, there being sufficient alkalinity in the additives to yield a pH above 8.5 in the resultant mixture.
Claim 2
Dependent Claim
134 words
In a process for the treatment of solidifiable aqueous wastes containing water-soluble environmental pollutants with a sufficient quantity of setting agent which converts the pollutants into a water-insoluble mass, the improvement which comprises treating the aqueous waste in a homogeneous condition, employing as the setting agent a particulate water-insoluble slag from metal refining, in the presence of a slag hydration-promoting combination of, sulfate and alkali metal ions and wherein 100 parts of starting waste are mixed with 5 to 35 parts of said slag, 0.02 to 15 parts of alkaline agent, 0.2 to 30 parts of said hydration-promoting combination, 0 to 2 parts of emulsifying agent and 0 to 150 parts of pozzolana, fly ash or clinker, there being sufficient alkalinity in the additives to yield a pH above 8.5 in the resultant mixture.
Claim 3
Dependent Claim
39 words
A process according to claim 1 wherein the alkaline conditions are obtained by the addition to the reaction mixture of an alkali metal hydroxide, an alkaline earth metal hydroxide or an alkaline agent yielding such a hydroxide by hydration.
Claim 4
Dependent Claim
35 words
A process according to claim 2 wherein the compound added to obtain the alkaline conditions is selected from the group consisting of sodium and calcium carbonates, sodium silicates, sodium aluminate and alkaline agents comprising them.
Claim 5
Dependent Claim
18 words
A process according to claim 3 wherein the alkaline conditions are obtained with cement clinkers or Portland cement.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein the hydration-promoting combination comprises gypsum, phosphogypsum or an alkali metal sulfate.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the alkali metal ions are provided by an alkali metal chloride, nitrate of nitrite.
Claim 8
Dependent Claim
21 words
A process according to claim 1 wherein pozzolana, fly ash, clinkers, or a mixture thereof is added to the reaction mixture.
Claim 9
Dependent Claim
16 words
A process according to claim 1 wherein an emulsifying agent is added to the reaction mixture.
Claim 10
Dependent Claim
17 words
A process according to claim 1 wherein a hydrophobic polymeric material is added to the reaction mixture.
Claim 11
Dependent Claim
38 words
A process according to claim 1 wherein the slag contains about 30 to 50% CaO, 25 to 40% SiO 2 , 8 to 20% Al 2 O 3 , 5 to 15% FeO and 2 to 8% MgO.
Claim 12
Dependent Claim
33 words
A process according to claim 1 wherein 0.2 to 8 parts of hydration-promoting agent and 5 to 30 parts of pozzolana, fly ash or clinker are employed per 100 parts of starting waste.
Claim 13
Dependent Claim
17 words
A process according to claim 1, wherein the aqueous waste contains at least 10% by weight solids.
Claim 14
Dependent Claim
17 words
A process according to claim 1, wherein the aqueous waste contains 40-70% by weight of free water.
References Cited (Backward Citations)
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US1635212A
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US2070036A
Cited
US2302988A
Cited
US3920795A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |