低品位富铁铝土矿烧结熟料浸出行为  

Leaching of Sintering Clinker from Low-grade and Iron-rich Bauxite

作　　者：何毅 周龑 王奕博 潘晓林 于海燕 HE Yi;ZHOU Yan;WANG Yibo;PAN Xiaolin;YU Haiyan(China Nonferrous Metal Industry's Foreign Engineering&Construction Co.,Ltd.,Beijing 100029,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]中国有色金属建设股份有限公司,北京100029 [2]东北大学冶金学院,沈阳110819

出　　处：《有色金属（冶炼部分）》2024年第12期43-49,共7页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(22078055)。

摘　　要：随着我国铝土矿品位的逐年降低,拜耳法很难满足氧化铝生产要求,烧结法的优势日益突出,而熟料浸出是烧结法生产氧化铝的关键工序,直接影响氧化铝浸出率、碱耗、赤泥沉降性能等技术经济指标。因此,本研究以低品位富铁铝土矿烧结熟料为原料,系统考察浸出工艺参数对熟料浸出性能的影响及其机理。结果表明,浸出液分子比、苛碱浓度、碳碱浓度和浸出温度、时间、液固比均能影响熟料浸出性能;矿石中氧化铁含量提高能够降低烧结熟料氧化铝浸出率,但降低幅度不大;在分子比1.25、苛碱浓度40 g/L、碳碱浓度25 g/L、浸出温度80℃、浸出时间20 min、液固比5的最佳浸出条件下,低品位富铁铝土矿烧结熟料Al_(2)O_(3)和Na_(2)O浸出率可分别达到85%和95%以上。As the bauxite grade in China decreases year by year,it is difficult for Bayer method to meet the requirements of alumina production,while the advantages of sintering method are becoming increasingly prominent.Clinker leaching is a key process in the production of alumina by the sintering method,which directly affects the technical and economic indicators such as alumina leaching rate,alkali consumption and red mud settling performance.Therefore,the effects of the leaching parameters on the leaching rates of Al_(2)O_(3) and Na_(2)O during the leaching process were studied using the sintering clinker from low-grade and iron-rich bauxite.The results show that molecular ratio,caustic concentration,carbonate concentration of leaching solution,leaching temperature,time,and liquid-solid ratio can all affect the leaching performance of clinker;the increase of iron oxide content in bauxite can reduce the alumina leaching rate of sintered clinker,but the reduction is not significant.The leaching rate of Al_(2)O_(3) and Na_(2)O in the sintering clinker can reach over 85% and 95%,respectively,under the optimum leaching conditions including molecular ratio of 1.25,caustic concentration of 40 g/L,carbonate concentration of 25 g/L,leaching temperature of 80℃,leaching time of 20 min and liquid-solid ratio of 5.

关 键 词：低品位铝土矿 熟料 浸出 氧化铝 烧结法 

分 类 号：TF821[冶金工程—有色金属冶金]