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Measurements of wntact angles for water, glycerol, formamide and diiodomethane on the surfaces of four low-rank coals covered with nalkanes were studied.
Demlnerallzatlon of a bltumlnous coal by froth flotation before obtaining activated carbons Rivera-Utrilla, J. et al., Carbon, 1996, 34, (7), 917-921. A Spanish bituminous coal has been demineralized by froth flotation. The effect of the particle size, solution pH, and the presence of electrolytes on the process yield has been investigated. The ash contents of the clean coal have been riduced by between 1.5-3 times with regard to the wrresponding feed coal. Three activated carbon samples have been obtained by steam activation of the floated coal.
π SIMILAR VOLUMES
quality trends. washahility relationships, material recovery, and case studies.
## Measurement of the contact angle of water, glycerol, formamide. methylene iodide, cc-bromonaphthalene, ethylene glycol and its aqueous solutions was carried out on the surface of Polish coal of rank 3 1.1,3 1.2,32.1, 32.2,33,34 and 35. On the basis of these results, the critical surface tension