The dissolution behaviour of titanium oxide phases in synthetic Bayer liquors at 90 °C

被引：21

作者：

Chester, R. ^{[1
]}

Jones, F. ^{[1
]}

Loan, M. ^{[2
]}

Oliveira, A. ^{[1
]}

Richmond, W. R. ^{[1
]}

机构：

[1] Curtin Univ Technol, Nanochem Res Inst, AJ Parker Cooperat Res Ctr Integrated Hydromet, Perth, WA 6845, Australia

[2] CSIRO, Div Minerals, AJ Parker Cooperat Res Ctr Integrated Hydromet, Waterford, WA, Australia

来源：

HYDROMETALLURGY | 2009年 / 96卷 / 03期

关键词：

Anatase; Rutile; Calcium titanate; Sodium titanate; Bayer process; Dissolution; TITANATE;

D O I：

10.1016/j.hydromet.2008.10.009

中图分类号：

TF [冶金工业];

学科分类号：

080601 [冶金物理化学];

摘要：

Many of the bauxites currently being processed to alumina contain titanium minerals. yet little fundamental knowledge is available regarding their dissolution behaviour in Bayer liquors. In this paper the dissolution of various titanium oxide phases (anatase, rutile. sodium titanate and calcium titanate) are presented. It is shown that rutile, calcium titanate and sodium titanate have the expected dissolution behaviour, which increases with free caustic concentration. Anatase. too, generally increases in dissolution with free caustic concentration. However, anatase is shown to have an anomalous behaviour when gibbsite co-precipitates. In this case, the dissolution of anatase does not follow the expected free caustic trend. According to the data presented, the most probable cause is an impervious aluminium/sodium titanate surface layer hindering further dissolution. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：215 / 222

页数：8

共 16 条

[1]

Thermodynamic modeling of aqueous aluminum chemistry and solid-liquid equilibria to high solution concentration and temperature.: I.: The acidic H-Al-Na-K-Cl-H2O system from 0 to 100°C [J].