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Estudo comparativo entre sílica obtida por lixívia ácida da casca de arroz e sílica obtida por tratamento térmico da cinza de casca de arroz
2006
Química Nova
Preserved Fulltext
ASH. A comparison between silica by acid leaching of rice husk (RH) and silica obtained from thermal treatment of rice husk ash (RHA) is presented. The best leaching results were obtained using 10% hydrochloric acid followed by washing with water. The alternative method, calcination of RHA at 700 ºC for 6 h followed by grinding for 80 min, was more effective. Silica obtained from RH was about 97% amorphous, had a 17.37 μm mean particle size, and a specific surface area of 296 m 2 /g. On the
doi:10.1590/s0100-40422006000600005
fatcat:ba2tbgyafrennh753elvptamcq