Theeffect of mechanochemical activation on the reactivity in the MgO–Al2O3–SiO2 system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Theeffect of mechanochemical activation on the reactivity in the MgO–Al2O3–SiO2 system

Authors:	C.A. d’Azevedo F.M.S. Garrido M.E. Medeiros

Affiliation:	1. Instituto de Pesquisas da Marinha – Rua Ipirú no. 2, Rio de Janeiro, Brazil, 21931-090, Ilha do Governador 2. Departamento de Química Inorganica, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil, 21945-970, Ilha do Fund?o

Abstract:	Samples of the MgO–Al₂O₃–SiO₂ ternary system, constituted by 28.5 mol% ofMgO, 28.5 mol% of Al₂O₃ and 43mol%of SiO₂, were activated in a roll mill and calcined at different temperatures. The influence of the grinding time, the used SiO₂ precursor and activation medium, furthermore the mass ratio between the powdered sample and zirconia cylinders was investigated on the reactivity of the MgO–Al₂O₃–SiO₂ ternary system. FTIR spectra and the X-ray powder diffraction patterns indicates the formation of Mg(OH)₂ at 393 K, of forsterite (MgSi₂O₅) and enstatite (MgSiO₃) at 1223 K and of spinel (MgAl₂O₄) between 1223 and 1523 K in some samples. The presence of cordierite (Mg₂Al₂Si₅O₁₈) was observed at 1523 K, a reaction pathway concerning its formation was proposed.

Keywords:	cordierite enstatit mechanochemistry spinel
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