Application of Unburned Carbon Produced from Seochun Power Plant

Abstract

Feasibility of utilizing unburned carbon residue in coal ash as a potential precursor for the production of activated carbon was assessed to seek for solution to recycle unburned carbon residue. The unburned carbon concentrate generated from the 4 stages of cleaner flotation has a grade of 87% carbon. The crystalline impurities in the concentrate included quartz and mullite. Unburned carbon had a low specific surface area of 10m 2 /g, which might be related to a high degree of coalification of domestic anthracite coal. Carbon particles were mostly porous and have a turbostratic structure. When 1g of carbon was activated with 6g of KOH powder, the highest specific surface area value of 670m 2 /g was achieved. Low wettability of unburned carbon particles, which was resulted from high temperature combustion in a boiler, might cause poor pore formation when they were activated by KOH solution. The activated carbon produced in this study developed micropores, with an equivalent quality of *

Compressive Strength Properties of Geopolymers from Pond Ash and Possibility of Utilization as Synthetic Basalt

“…20) Alternative ways of removing unburned carbon include sieve analysis, triboelectrostatic separation, froth flotation, and agglomeration methods. 24) In this study, a sieve analysis method was employed. The method was capable of removing unburned carbon and reducing the particle size of coal ash through simple processes.…”

“…1,3) Pond ash, which refers to ash submerged in seawater, is composed of reject ash which falls into the category of large-particle fly ash, and bottom ash. Pond ash has high unburned carbon content 4) and impurities, such as soil and seawater salt. Also, this type of ash is weathered because it has been exposed to the air for a long period of time.…”