Chemical leaching of coal to remove ash, alkali and vanadium
US4582512A · kind A · utility
6Cited by
7References
5Claims
0Family size
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Key dates
| Filing date | Jun 20, 1984 |
| Grant date | Apr 15, 1986 |
| Priority date | — |
| Expiry date | Jun 20, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Powdered coal is upgraded in utility and heat value by removal of ash and pyrite constituents by successively pressure caustic leaching the coal slurry at a temperature of at least about 175.degree. C., hydrochloric acid leaching the caustic leached coal to dissolve ash and pyrite residues not dissolved by the caustic, and pressure leaching the acid leached coal to remove alkali metals and chloride. Vanadium is also removed by the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.