97/01613 Demineralization of a bituminous coal by froth flotation before obtaining activated carbons

• Publisher: Elsevier Science
• Year: 1997
• Weight: 197 KB
• Volume: 38
• Category: Article
• ISSN: 0140-6701
• DOI: 10.1016/s0140-6701(97)87564-9

✦ Synopsis

Tests were carried out on six US coals and a crystallized quartz in an instrumented laboratory high-pressure grinding rolls machine equipped with IOO-mm-diameter rolls. As expected, the specific capacity decreased with increased grinding pressure for each material tested. There were significant differences among the six coals in the critical angle of nip, the effective feed porosity and the variation of strain at the gap relative to the grinding pressure. Although a precise correlation was not ohtained. the overall effect of these factors was that, at a given grinding pressure, the specific capactty increased as the Hardgrove grindability index of the coal increased.