The Study of Porous Aggregate Manufacture with the Black Ash from Gasification of Rice Husk

This study aimed to propose the processing conditions and formula of making porous aggregates with the black ash, which is produced from gasification of rice husk and to provide a new environmental protection material for industry. The results indicated that higher thermal temperature results in fewer impurities in this black ash, as well as better SiO2 crystallization. Relatively, surface area reduced and water flow loss is decreased. The designed mixture of intensifier and binder added in the sintered porous aggregates can increase strength without causing great loss of surface areas. There is an optimal condition existing. The recommended components include kaolin, starch and this black ash, which ratio is 0.9:0.3:2 are treated by some dispersing agent (CaCO3 solution) for the uniformity of this mixture and sintered at 900°C, with less oxygen for this optimal process. The surface area of the aggregate is 105.88.88 m2 g-1, strength is 123.95 psia, and loss on water flow is 1.1277% in the optimal condition.