摘要
采用铝硅比为5.48的贵州中低品位一水硬铝石型铝土矿进行石灰拜尔法溶出实验,系统地研究石灰添加量、母液苛碱质量浓度和溶出温度等因素对溶出过程的影响。研究结果表明:随着石灰添加量的增大,溶出赤泥铝硅比和钠硅比均呈明显的下降趋势,增大石灰添加量对降低碱耗效果十分明显。贵州中低品位铝土矿石灰拜尔法适宜的溶出条件如下:石灰添加量为10%,配料分子比为1.45,循环母液苛碱质量浓度为200 g/L左右,溶出温度为270℃左右,溶出时间50 min,在此溶出条件下,溶出液苛性比<1.40,赤泥铝硅比<1.20,钠硅比<0.38,氧化铝相对溶出率>95%。
The digestion experiments of lime Bayer process using diasporic bauxite from Guizhou Province with low and medium grades（alumina-silica ratio is 5.48） were completed. The influences of lime amount, proportioning molar ratio, spent liquor＇s caustic soda mass concentration, digestion temperature and digestion time on the digestion process were investigated systematically. The results show that alumina-sillicon ratio and sodium-sillicon ratio of red mud decrease obviously with increasing lime amount. Increase of lime charge will effectively reduce soda consumption. The suitable conditions for digestion of lime Bayer process is as follows： lime amount is 10% to bauxite, proportioning molar ratio is 1.45, spent liquor＇s caustic soda mass concentration is controlled to about 200 g/L, digestion temperature is about 270 ℃and digestion time is of 50 min. When adopting the above conditions in the digestion process, αk of digested solution reaches less than 1.40, alumina-silica ratio of red mud is below 1.20, sodium-silica ratio of red mud is smaller than 0.38 and relative extraction yield of alumina is above 95%.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第5期1397-1402,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学青年基金资助项目(51208193)
湖南省教育厅资助项目(09C342)
关键词
一水硬铝石
中低品位铝土矿
石灰拜尔法
溶出
diaspore
bauxite with low and medium grade
lime Bayer process
digestion
