Recarbonation of spent oil shale
US4016239A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1975 |
| Grant date | Apr 5, 1977 |
| Priority date | — |
| Expiry date | May 22, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S208/951
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Spent oil shale from retorting operations, containing water-soluble alkaline oxides such as calcium oxide is subjected to a recarbonation process in order to reduce its alkalinity and thereby prevent ecological damage to plant and aquatic animal life which could result from alkaline leachings derived rom rain or snowfall on open dumps of such spent shale. For economic reasons, a rapid recarbonation is necessary, and such is achieved herein by wetting the spent shale with water containing dissolved carbonate and/or bicarbonate salts, and contacting the so wetted spent shale with an atmosphere comprising a substantial partial pressure of carbon dioxide for a period of time ranging between about 10 minutes and two hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.