Dissolution rate of Al2O3 into molten CaO-Al2O3-CaF2 flux

被引：30

作者：

Li, J. L. ^{[1
,2
]}

Shu, Q. F. ^{[1
,2
]}

Liu, Y. A. ^{[1
,2
]}

Chou, K. C. ^{[1
,2
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 10083, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Dept Phys Chem Met, Beijing 100083, Peoples R China

来源：

IRONMAKING & STEELMAKING | 2014年 / 41卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Mould fluxes; Dissolution rate; Alumina; Rotating cylinder; ALUMINA-SILICA MELTS; MOLD FLUXES; SINTERED ALUMINA; SLAGS; BEHAVIOR; SAPPHIRE; KINETICS; SYSTEM;

D O I：

10.1179/1743281214Y.0000000187

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Dissolution of Al2O3 into molten CaO-Al2O3-CaF2, a base system of mould flux for continuous casting of high Al steel, has been investigated by employing a rotating cylinder method. The dissolution rate of an alumina rod into molten CaO-Al2O3-CaF2 flux increased with increase in rotating speed and temperature. The apparent activation energy for mass transport of flux C was calculated to be 255.6 kJ mol(-1). The rate controlling step during the dissolution process of the alumina rod into molten CaO-Al2O3-CaF2 flux was found to be the diffusion of the solute in the flux boundary layer. The dissolution rate of alumina into molten CaO-Al2O3-CaF2 flux increased with increasing CaO/Al2O3, and it may be caused by the increase in thermodynamic driving force and the decrease in the viscosity of the flux. When the Al2O3 rod was immersed into molten flux, an intermediate compound of CaO center dot 2Al(2)O(3) formed firstly and then dissolved into molten flux.

引用

页码：732 / 737

页数：6

共 23 条

[1] Dissolution behavior of alumina in mold fluxes for steel continuous casting [J].