煤下铝土矿焙烧碱浸脱硅及精矿溶出试验  

Desilication of a Bauxite under Coal Mine by Roasting,Alkali Leaching and Bayer Digestion of Desilication Concentrate

作　　者：武国宝 齐利娟 韦舒耀 韩东战 WU Guo-bao;QI Li-juan;WEI Shu-yao;HAN Dong-zhan(Zhengzhou Non-ferous Metals Research Institute Co.,Ltd.of Chalco,Zhengzhou 450041,China)

机构地区：[1]中铝郑州有色金属研究院有限公司,郑州450041

出　　处：《有色金属（冶炼部分）》2022年第11期48-53,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：中国铝业股份有限公司科技专项(中铝股份科发字[2022]111号)。

摘　　要：对煤下铝土矿进行了焙烧、碱浸脱硅和精矿溶出试验。在970~1020℃焙烧10 min后,焙烧矿中的C_(T)可降低至0.03%以下,S_(T)可降低至0.20%以下;焙烧矿经过碱浸脱硅后,精矿A/S提高到10.02~11.25,脱硅过程氧化铝回收率大于98%。在溶出温度265℃、铝酸钠溶液Na_(2)O_(K)=236 g/L、石灰添加量12%、溶出液α_(K)=1.45左右、溶出时间60 min的条件下,精矿的氧化铝溶出率达到83.94%~85.04%,相对溶出率达到92.13%~94.46%。溶出赤泥中的Na_(2)O含量低于1%,为赤泥安全堆存和综合利用创造了良好的基础条件。Experiments on desilication of certain bauxite under coal by roasting,desilication by alkali leaching,and Bayer digestion were carried out.The results show that C_(T) and S_(T) in the roasted ore can drop to 0.03% below and 0.20% below respectively after roasted for 10 minutes at 970—1020℃.The A/S of the desilicated concentrate can rise to 10.02—11.25 after the roasted ore desilicated by alkali leaching,and the recovery ratio of alumina during desilication is over 98%.The digestion efficiency of alumina is 83.94%—85.04%,and relative digestion efficiency of alumina is 92.13%—94.46% under the conditions including digestion temperature of 265℃,Na_(2)O_(K)=236 g/L,lime addition of 12%,α_(K) of about 1.45,and digestion time of 60 min.Na_(2)O in red mud is 1% below,which good basic conditions have been created for safe storage and comprehensive utilization of red mud.

关 键 词：煤下铝土矿 焙烧 碱浸脱硅 拜耳法溶出 

分 类 号：TF821[冶金工程—有色金属冶金]