从赤泥中联合提取铁和氧化铝试验  

Experiment on the combined extraction of iron and alumina from red mud

作　　者：高建军[1] 齐渊洪[1] 居殿春[1] 程相利[1] 郭玉华[1] 

机构地区：[1]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081

出　　处：《钢铁》2015年第9期11-16,共6页Iron and Steel

基　　金："十二五"国家科技支撑计划资助项目(2011BAE04B00);国际科技合作项目资助项目(2013DFG50640)

摘　　要：赤泥是从铝土矿中浸出氧化铝后产生的固态废渣,含有一定量的铁、氧化铝以及其他有价金属元素。为了综合回收赤泥中铁和氧化铝,开发了赤泥配碳制备成含碳球团,含碳球团直接还原-熔分生产金属铁,熔渣自粉化浸出氧化铝的方法。试验研究了不同工艺参数对赤泥中铁和氧化铝提取结果的影响,得到的最佳工艺条件为:碳氧比为1.8,还原温度为1 250℃,还原时间为60 min,熔分温度为1 500℃,熔分时间为20 min,熔渣冷却速度小于20℃/min,钙铝比为1.6。在最佳工艺参数下,得到的生铁磷、硫质量分数分别为0.047%和0.017%,熔渣中w(Fe O)为1.26%,熔渣自粉化完全,自粉化渣中Al2O3浸出率可以达到86.65%。Red mud is the solid waste residue generated during alumina production from bauxite,which contains considerable amount of alumina,ferric oxide and other valuable metals. In order to recovery alumina and iron from red mud,the process of pig iron produced by direct reduction-smelting of carbon-containing red mud pellets,and alumina leaching from self-disintegrating slag was developed. The effects of different process parameters on extraction of iron and alumina from red mud were researched. The optimum reaction parameters were obtained as the following：the ratio of carbon to oxygen is 1.8,the time of direct reduction at 1 250 ℃ is 60 min,the time of smelting at 1 500 ℃ is 20 min,slag cooling rate must be less than 20 ℃/min,the ratio of calcium oxide to alumina is 1.6. With these optimum parameters,the phosphorus and sulfur content in the pig iron were 0.047% and 0.017% respectively,the ferrous oxide content in the slag was1.26%,the slag can disintegrate completely,and the alumina leaching ratio can reach 86.65%.

关 键 词：赤泥 氧化铝 直接还原 熔分 浸出 

分 类 号：X758[环境科学与工程—环境工程]