Production of silica gel from residual rice husk ash

Quimica nova

Cordeiro, Guilherme Chagas¹  Vasconcelos, Raimundo Pereira de²  Lima, Samantha Pinheiro Buás de²  Paiva, Otávio Augusto²  Toledo Filho, Romildo Dias³  Fairbairn, Eduardo de Moraes Rego³  Chaves, Márcia Rodrigues de Morais⁴ 

[1] Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Brasil;Universidade Federal do Amazonas, Manaus, Brasil;Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil;Universidade de São Paulo, São Paulo, Brasil

关键词: silica gel;    sol-gel;    rice husk ash.;   

DOI  :  10.1590/S0100-40422011000100014

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

This paper presents a study on the production of silica gel in hydrothermal process using residual rice husk ash. Measurements of the chemical composition, X-ray diffraction, infrared spectroscopy, particle size distribution, and pozzolanic activity were carried out in order to characterize the obtained material, and the optimal silica gel was selected for use as a mineral additive in cement pastes. The compressive strengths were determined for cement pastes containing silica gel (0.0, 2.5 or 5% by mass) in different times. The results indicate that the mixtures containing silica gel showed improved mechanical behavior over all time periods evaluated.

【 授权许可】

CC BY