Caracterização de cinzas provenientes de fornalha do tipo grelha móvel

Abstract

The use of grate furnaces is important to energy generation also as to decrease carbon emissions to atmosphere through the burning of biomass, because this source of renewable energy. Deriving from various organic sources, being the case study coming from bark, chip, wood strands and tree leaves from pine (Pinus Taeda),.the combustion process inside the chamber occurs in three steps, drying, ignition and combustion, generating two ashes types, bottom ashes and fly ashes, both are mixed and rejected, therefore fly ashes have some particularities that could be reused. A sample of fly ash was collected and separated in three portions for studies and tests. A portion was earmarked for preliminary trials, basead on same trials for green sand, second part sent to tests to determinate clay content and granulometric distribution and another part sent to X-ray diffration analysis, all data was compiled and the present inorganic material can be determinated. The organic portion is large yet is easy to sort. The fly ash is formed by low quartz alpha sílica, a good concentration in meshes #50, #70, #100, low fines, good granulometric distribution, it can be used as casting sand material in addition to other applications that have already been studied, microphotograph made show that silica from the fly ashes is ideal for aplications in foundry as molds.