中南大学学报（英文版）
中南大學學報（英文版）
중남대학학보（영문판）
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY(ENGLISH EDITION)
2014年
6期
2168-2175
,共8页
吕国志%张廷安%王小晓%张旭华%刘燕%赵秋月%豆志河
呂國誌%張廷安%王小曉%張旭華%劉燕%趙鞦月%豆誌河
려국지%장정안%왕소효%장욱화%류연%조추월%두지하
bauxite%intense-magnetic-field%phase-transformation%digestion-performance%settling-performance
The effects of magnetic field intensity, roasting temperature and roasting time on digestion rate and settling performance of bauxite with different iron contents were investigated systematically. The results indicate that such magnetic treatment can profoundly change the microstructure and digestion performance of bauxite. For the two samples carrying different iron contents, phase transformation of the aluminum oxide phase proceeds faster in the high iron bauxite than the low one. The optimal pretreatment conditions of low iron bauxite are roasting temperature 550 °C and magnetic field intensity 6 T, while for high iron bauxite are 500 °C and 9 T. The digestion rate of alumina can reach 95% and 92% at digestion temperature of 190 °C and 250 °C. The settling performances of roasted ore by intense magnetic field after digestion are enhanced through pretreatment.
