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http://dx.doi.org/10.6111/JKCGCT.2017.27.5.249

The study of geopolymer utilization of reclaimed ash by using magnetic separation method  

Kim, Kangduk (Department of Advanced Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.27, no.5, 2017 , pp. 249-255 More about this Journal
Abstract
Using a magnetic separation process, pond ash generated in thermoelectric power plants was separated into magnetic materials and nonmagnetic materials in order to make it into a raw material of geopolymers and unburned carbon; screening characteristics according to the particle sizes and magnet strength levels of the pond ash were observed. Based on the results of magnetic separation into fine particle (0.15~0.84 mm) and rough particle (0.84~2.4 mm) pond ash using 3000 G magnets, the weight fraction and ignition loss of nonmagnetic materials were found to be higher than those of magnetic materials, regardless of the particle size. In the case of fine particle pond ash, when the magnet strength was increased from 3000 G to 10000 G, even those materials that were weakly magnetic were separated into magnetic materials, leading to drastic increases in the weight fraction of magnetic materials, such that the ignition loss accounted for 66.9 % (22.8 wt%) of the entire ignition loss of 32.6 wt%, despite of the low ignition loss. Based on the results of measurement of the compressive strength levels of geopolymers made of magnetic-separated rough particle pond ash, the compressive strength of geopolymers made of magnetic materials containing small amounts of unburned carbon was found to be 20 MPa.
Keywords
Reclaimed ash; Magnetic separation; Unburned carbon; Geopolymer;
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Times Cited By KSCI : 5  (Citation Analysis)
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