Comparative study of silica obtained from acid leaching of rice husk and the silica obtained by thermal treatment of rice husk ash

Quimica nova

Della, Viviana Possamai¹  Junkes, Janaína Accordi¹  Oliveira, Antonio Pedro Novaes de¹  Hotza, Dachamir¹ 

[1] Universidade Federal de Santa Catarina, Florianópolis, Brasil

关键词: silica;    rice husk;    acid leaching.;   

DOI  :  10.1590/S0100-40422006000600005

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A comparisonbetween silica by acid leaching of rice husk (RH) and silica obtained from thermaltreatment of rice husk ash (RHA) is presented. The best leaching results wereobtained using 10% hydrochloric acid followed by washing with water. The alternativemethod, calcination of RHA at 700 ºC for 6 h followed by grinding for 80min, was more effective. Silica obtained from RH was about 97% amorphous, hada 17.37 µm mean particle size, and a specific surface area of 296 m2/g.On the other hand, for silica obtained from RHA the values were about 95% amorphousmaterial 0.68 µm, and 81 m2/g.

【 授权许可】

CC BY