Evaluation of Bayer process gibbsite reactivity in magnesium aluminate spinel formation

被引：7

作者：

Mora, A.

Gutierrez-Campos, D.

Lavelle, C.

Rodriguez, R. M.

机构：

[1] Univ Metropolitana, Dept Chem, Caracas 1070, Venezuela

[2] Univ Simon Bolivar, Dept Mat Sci, Caracas 1080A, Venezuela

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 454卷

关键词：

ceramics; spinel; magnesium aluminate; sintering; industrial gibbsite;

D O I：

10.1016/j.msea.2006.12.004

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Stoichiometric magnesium aluminate spinel was synthesized by solid-state reaction of calcined magnesia with tabular alumina, calcined alumina and industrial gibbsite at 1100, 1300 and 1500 degrees C for 2 h. The pellets made from both types of alumina and magnesia expanded after the heat treatment, whereas pellets made from industrial gibbsite and magnesia contracted. It was found that shrinkage could be produced by phase transformations in gibbsite and magnesia densification process in unreacted magnesia during the sintering. The X-ray diffraction patterns indicated a minor reactivity for industrial gibbsite in comparison with the calcined alumina and tabular alumina at all firing temperatures. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：139 / 143

页数：5

共 34 条

[1] Fracture behaviour of magnesia and magnesia-spinel composites before and after thermal shock [J].