US4623469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for rendering hazardous wastes less permeable and more resistant to leaching
Assignee: Chem-Technics Inc
•
Filing: 1985-02-26
•
Granted: 1986-11-18
•
Expires: 2005-02-26
Abstract
Abstract A method for treating liquid and semi-liquid wastes to render them fit for ultimate disposal, by first determining the ionic charge of the waste counter ions. An appropriate suspension of emulsified asphalt particles is then selected having an opposite particle charge to the ionic charge of the waste counter ions. The waste is then mixed with the selected suspension of emulsified asphalt particles at ambient temperature in an amount sufficient to react with the waste counter ions and coalesce into a hydrophobic mass.
Inventors
- 👤 Jesse R. Conner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:31
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/281; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
A method of treating hydrophilic liquid and semi-liquid wastes to render them fit for ultimate disposal in a solid mass, comprising the steps of: determining the ionic charge of counter ions in the waste; selecting a suspension of emulsified asphalt particles having an opposite particle charge to the ionic charge of the counter ions; admixing the selected suspension of emulsified asphalt particles with the waste at ambient temperature in an amount sufficient to neutralize the ionic charge of the asphalt particles and coalesce the admixture into a hydrophobic mass, the final concentration of the suspension of emulsified asphalt particles being between approximately 0.1% and 40% by weight of the waste treated, whereby the admixture of waste and asphalt is converted into a physically stable hydrophobic solid end product substantially impermeable to water.
Claim 2
Independent Claim
132 words
A method of treating hydrophilic liquid and semi-liquid wastes to render them fit for ultimate disposal in a solid mass, comprising the steps of: determining the ionic charge of counter ions in the waste; selecting a suspension of emulsified asphalt particles having an opposite particle charge to the ionic charge of the counter ions; admixing the selected suspension of emulsified asphalt particles with the waste at ambient temperature in an amount sufficient to neutralize the ionic charge of the asphalt particles and coalesce the admixture into a hydrophobic mass, the final concentration of the suspension of emulsified asphalt particles being between approximately 0.1% and 40% by weight of the waste treated, whereby the admixture of waste and asphalt is converted into a physically stable hydrophobic solid end product substantially impermeable to water.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said emulsified asphalt is a cationic emulsified asphalt.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said emulsified asphalt is an anionic emulsified asphalt.
Claim 5
Dependent Claim
33 words
The method of claim 1, comprising the step of adding a neutralizing material to adjust the ionic charge of the waste counter ions to react with the selected suspension of emulsified asphalt particles.
Claim 6
Dependent Claim
20 words
The method of claim 4, wherein said neutralizing material is selected from a group comprising anionic materials and cationic materials.
Claim 7
Dependent Claim
20 words
The method of claim 1, wherein the hardening of the emulsion of asphalt is caused by the removal of water.
Claim 8
Dependent Claim
18 words
The method of claim 1, wherein a solidification agent is admixed with said waste and said emulsified asphalt.
Claim 9
Dependent Claim
15 words
The method of claim 7, wherein said solidification agent comprises cement and alkali metal silicate.
Claim 10
Dependent Claim
13 words
The method of claim 8, wherein said alkali metal silicate comprises sodium silicate.
Claim 11
Dependent Claim
11 words
The method of claim 8, wherein said cement comprises Portland cement.
Claim 12
Dependent Claim
29 words
The method of claim 1, wherein the amount of said emulsified asphalt added is in the range of from about 0.1% to about 20% by weight of waste treated.
References Cited (Backward Citations)
US1598636A
Cited
US1889437A
Cited
FR1246848A
Cited
US3226318A
Cited
US3305894A
Cited
US3591542A
Cited
US3837872A
Cited
US3837872B1
Cited
US4056362A
Cited
US4010108A
Cited
US4019628A
Cited
US3893656A
Cited
US4084981A
Cited
US3971732A
Cited
US4009116A
Cited
US3841102A
Cited
US4012320A
Cited
US4196169A
Cited
US3988258A
Cited
US4060425A
Cited
US4077901A
Cited
US4174293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |