Open AccessAppalachian clean coal technology consortium. Technical quarterly progress report, October 1, 1996--December 31, 1996
Author(s) -
RoeHoan Yoon,
B. Basim,
G.H. Luttrell,
D.I. Phillips
Publication year - 1997
Language(s) - English
Resource type - Reports
DOI - 10.2172/481925
Subject(s) - dewatering , coal , reagent , moisture , waste management , filtration (mathematics) , pulp and paper industry , clean coal , environmental science , chemistry , engineering , mathematics , geotechnical engineering , organic chemistry , statistics
Novel chemicals that can be used for increasing the efficiency of fine coal dewatering was developed at Virginia Tech. During the past quarter, Reagent A was tested on three different coal samples in laboratory vacuum filtration tests. These included flotation products from Middle Fork plant, Elkview Mining Company, and CONSOL, Inc. The tests conducted with the Middle Fork coal sample (100 mesh x 0) showed that cake moisture can be reduced by more than 10% beyond what can be achieved without using dewatering aid. This improvement was achieved at 1 lb/ton of Reagent A and 0.1 inch cake thickness. At 0.5 inches of cake thickness, the improvement was limited to 8% at the same reagent dosage. The results obtained with the Elkview coal (28 mesh x 0) showed similar advantages in using the novel dewatering aid. Depending on the reagent dosage, cake thickness, drying cycle time and temperature, it was possible to reduce the cake moisture to 12 to 14% rage. In addition to achieving lower cake moisture, the use of Reagent A substantially decreased the cake formation time, indicating that the reagent improves the kinetics of dewatering. The test results obtained with CONSOL coal were not as good as with the other coals tested in the present work, which may be attributed to possible oxidation and/or contamination