Method of treating coal to remove sulfur and ash
US4305726A · kind A · utility
62Cited by
8References
11Claims
0Family size
Inventor
Key dates
| Filing date | Dec 21, 1979 |
| Grant date | Dec 15, 1981 |
| Priority date | — |
| Expiry date | Dec 21, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L9/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to an improved method of chemically treating coal to remove sulfur and ash. It is especially adapted for use on high sulfur, refuse coal. In practice the coal is treated with hydrochloric acid and hypochlorous acid in the presence of ferric and ferrous sulfate to convert the iron pyrites to other sulfur compounds. These are then converted to various salts of calcium through neutralization with lime.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.