Demineralization of coal
US4299684A · kind A · utility
1Cited by
11References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1980 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Jun 30, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03B9/005
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a method for comminuting and simultaneously removing mineral matter from coal by first treating the coal with a quaternary base solution, such as tetrabutylammonium hydroxide, then physically separating the mineral matter by any conventional separation technique based on the density differences of two materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.