Coal Age

JAN 2013

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dewatering continued cesses the entire 85 tph solid tons of minus 1-mm fine refuse material by dewatering the material to a 25% moisture filter cake. These presses are capable of creating compaction densities sufficient for combined refuse areas. The Tons Per Hour/Jingjin filter presses have proven to be a viable option for fine coal refuse disposal. Author Information White is a preparation plant engineer working for Patriot Coal Services. This article is adapted from a presentation he made at Coal Prep 2012, which took place in May 2012 in Lexington, Ky. To see the original article, visit: www.coalprepshow.com. Acknowledgments Figure 3: The flow of material in the plate and frame system (Tons Per Hour, 2011). to operate at its raw feed capacity (900 tph). With the integration of PLC software, cycle times can be manipulated to produce the desired product. The Tons Per Hour/Jingjin membrane filter presses allowed Patriot Coal's Blue Creek prep plant to process 900 tph of Stockton seam coal without stopping production. The plate and frame system pro- The installation of the Blue Creek plate and frame system was supervised by Roger Graley, director of preparation plants for Patriot Coal Services, LLC. His assistance in this installation was greatly appreciated. Tons Per Hour, Inc. and Michael Parker deserve a special thank you for their assistance in the installation as well. Material Handling The Blue Creek prep plant has had no issues producing a filter cake with 25% or better moisture since the commencement of this project. Six months of sampling display the moisture levels being right at or below 25%. Mobile equipment transports the filter cake from the refuse bin to the permitted combined fill area. When the trucks are loaded, the dewatered fine refuse material is hauled to the existing dump area and is incorporated with the coarse. The permit requires this combined coal refuse material to be placed in 24inch thick lifts (maximum). Each area is then graded to minimize precipitation from permeating the combined material. Following the completion of each lift, representative samples are taken for compaction records. Five such samples were taken on three days in August 2011; these samples confirmed the average moisture of the combined refuse area is 3.67%. The same samples produced an average compaction density of 116 lb/ft 3 . With a required compaction density of 113.6 lb/ft3, the samples demonstrate that the compaction completion is at 102%. January 2013 www.coalage.com 41

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