Preparation of coal substitute of low ash and sulfur
US4830634A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 3, 1986 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Sep 3, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L1/326
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process is taught for preparing a coal substitute of low ash level from a composite of coal, mineral matter and pyritic sulfur comprising comminuting the coal composite in an aqueous medium to a size range which promotes the liberation of the mineral matter; subjecting the resulting slurry to fines agglomeration in the presence of a water-insoluble bridging organic liquid; separating the agglomerates from the liquid phase containing the bulk of the mineral matter and a portion of the pyritic sulfur; treating the coal fines by stripping the organic liquid from the fines surface; and redispersing the fines in an aqueous medium having a surface active agent to yield a high solids coal fines slurry so to permit magnetic separation of residual pyritic sulfur and other magnetic mineral matter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.