Abstract: Due to changes in process, equipment and feeding, there exists incomplete combustion phenomenon in the incineration ash, which does not meet the requirements of subsequent treatment and brings trouble in safety. By using microwave ashing furnace to heat the incomplete combustion ash and relatively completed combustion ash, a series of tests and characterizations of weight loss, weight loss rate and composition of incineration ash were carried out before and after heating. The feasibility and principle of microwave heating for incineration ash were studied, and the process conditions of microwave treatment were preliminarily explored. The results show that it was feasible for incineration ash by microwave heating, which could achieve the same effect as the traditional muffle furnace. The performance of microwave treatment of incineration ash was related to heating power, heating time and treatment capacity. The heating power and heating time determined the efficiency of microwave treatment of incineration ash, and the processing capacity determined the ability of microwave treatment of incineration ash. The treatment efficiency was preliminarily explored. For incineration ash with particle size under 1 mm, the treatment efficiency was roughly the same when the power was enough.

Key words: incineration ash, incomplete combustion, microwave heating, treatment efficiency