Time-controlled processes for agglomerating coal
US4770766A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Mar 12, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03B1/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Methods of recovering agglomerated particles of a carbonaceous constituent such as coal from a composite of that constituent and mineral matter. An additive is incorporated into a slurry of the composite to control the agglomeration time and/or to insure that the carbonaceous particles will agglomerate. Appropriate additives are: PA0 Naturally occurring hydrocarbonaceous substances such as road asphalts, Gilsonite, pentane extracts of coals, tar sands oils, coal tars, and alcohols having six or more carbon atoms PA0 Castor oil PA0 Isopropyl ether PA0 Hydrolized linseed oil PA0 2-Ethylhexyl acetate PA0 Ionic dispersants such as ammonium salts of lignosulfonates PA0 Nonionic dispersants such as dextrins PA0 A compound having the formula R--O--R, R.sub.2 --CO, R--COOH, or R--COOR where R is an aliphatic moiety having at least six carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.