Abstract |
The purpose of the study has been to investigate the potential use of wet-collected, limestone or dolomite-modified flyashes resulting from sulfur dioxide control methods. Specific areas under investigation have included dewatering, alumina leaching, and production of structural products by employing potential cementitious properties of the modified flyashes. Several methods of dewatering solid materials were applied on a bench scale to flyash from a coal-fired electric power plant. Porous-bed sand filtration, lagooning and possibly pressure filtration appear to hold the most promise. Aluminum extraction tests using sodium hydroxide, sodium carbonate and combinations of the two yielded less than 50 percent of the aluminum available in the leach liquor while structural materials testing indicated that there is insufficient free lime available in the modified ash to act as a suitable binding agent. (Modified author abstract) |