Dewatering of Coal-clay Waste At Paradise Steam Complex.
Paper in Proc & Util of High Sulfur Coals Amsterdam 1985 :11 pages
The Bureau of Mines has investigated a dewatering technique for coal- clay waste that uses a flocculant, polyethylene oxide (peo). This flocculant forms strong stable flocs that can be dewatered on either a hydrosieve screen or a combination of hydrosieve and trommel screens. A field test unit (ftu) was operated at a rate of 80 to 160 gal/min at a coal mine in western Kentucky at which coal-clay waste was dewatered first on a static screen, then on a trommel screen, to 50 pct solids using a polymer dosage of 0.12 to 0.15 Lb/ton. The dewatered material continued to dewater, reaching 68 to 70 pct solids in 7 days when placed in a pond. The dewatered material was shown to be stable even when subjected to a heavy rainfall. Experiments were also made in which dewatered material was mixed with coarse waste from the preparation plant. A stackable mixture was obtained when four parts coarse waste was mixed with one part dewatered material.
Paper in Proc. & Util. of High Sulfur Coals, Amsterdam, 1985, PP. 395-405