Pilot Demonstration of Technology fo the Production of High Value Materials from the Ultra-Fine (PM 2.5) Fraction of Coal Combustion Ash

Robl, T.L. ; Groppo, J.G. ; Henke, K.R.

University of Kentucky

关键词: Leaching;    Combustion;    Testing;    Capacity;    Sediments;   

DOI  :  10.2172/881987
RP-ID  :  none
RP-ID  :  FC26-03NT41726
RP-ID  :  881987

美国|英语

来源: UNT Digital Library

【 摘 要 】

Work on the project primarily focused on the design and testing of different hydraulic classifier configurations. A four cell, open channel, cross flow classifier with and without weirs separating the cells was evaluated. Drawbacks to this configuration included thick sediment compression zones and relatively low throughput. The configuration was redesigned with inclined lamellae plates, to increase sedimentation area and decreased sediment compression zone thickness. This configuration resulted in greater throughput for any given product grade and enhanced product recovery. A digital model of a hydraulic classifier was also constructed based upon Stokes law and the configurations of the tests units. When calibrated with the size of the ash used in the tests, it produced a reasonable approximation of the size, yield and recovery of the actual product. The digital model will be useful to generate test data, at least on a relative basis, of conditions that are hard to generate in the laboratory or at larger scale. Test work on the dispersant adsorption capacity, settling tests and leaching test were also conducted on materials collected from the Coleman power station pond.