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，对溶出后赤泥浆液的沉降分离性能进行实验研究，探讨稀释矿浆脱硅时间、稀释矿浆质量浓度和絮凝剂等因素对赤泥浆液沉降分离过程的影响。实验结果表明：贵州铝土矿经石灰拜尔法高压溶出、稀释后，当控制溶液氧化铝质量浓度为165g／L左右，赤泥沉降分离料浆固含约为85g／L时，适宜的脱硅时间为2～3h。稀释脱硅后，赤泥浆液添加絮凝剂CM180进行沉降分离效果较好，当其添加量为210g／t时，5min和10min平均沉降速度分别达19．0和12．1mm／min，30min压缩液固比可达5．29。
The experimental investigation about settlement and separation performance of red mud generated from lime Bayer process using diasporic bauxite from Guizhou province with low and medium grade （alumina-silica ratio is 5.48） was performed. The effects of diluted desilication time, diluted slurry’s mass concentration and flocculants on the settlement and separation process of red mud were investigated. The results indicate that the suitable desilication time for diluted slurry whose Al2O3 mass concentration and solid content are controlled to be about 165 g/L and 85 g/L respectively is 2-3 h. When flocculant type CM180 with 210 g/t dosage is added to the desilicated red mud slurry, the average settling rate of red mud in initial 5 min and 10 min can reach 19.0 and 12.1 mm/min respectively, and the liquid solid compression ratio of red slurry can reach 5.29.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第4期1028-1033,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)
湖南省教育厅项目(09C342)
关键词
一水硬铝石
中低品位铝土矿
石灰拜尔法
赤泥沉降分离
絮凝剂
diaspore
bauxite with low and medium grade
lime Bayer process
sedimentation and separation of red mud
flocculants
