Flocculation high-sulfur coals, selective

Separation of Ultrafine Pyrite from High Sulfur Coals by Selective Dispersion and Flocculation... 

Preliminary testing of the unpurified polyxanthate dispersant mentioned earlier, during the selective flocculation of three high sulfur coals, is described here. The coal samples used for the study were Kentucky No. 9, Meigs Creek, and Ohio No. 6. The coal... 

Attia, Y. A., and Fuerstenau, D. W., "Feasibility of Cleaning High Sulfur Coal Fines by Selective Flocculation", Fourteenth Intern. Miner. Process Congr., Toronto, Canada, 1982. 

The lower rejection ratio of 16 was accompanied by high selectivity in pyritic sulfur dispersion. This was due to the higher (10 mg/l) flocculant concentration which resulted in higher coal yield (93.1 wt) in the flocculated fraction. On the other extreme, when higher dispersant concentration (500 mg/l) was used with lower flocculant concentration (2 mg/l), much less coal was flocculated (77 wt) and more sulfur was apparently rejected (39 ). The intermediate conditions of 300 mg/l PAAX dispersant and 2 mg/l flocculant produced correspondingly intermediate results. 

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