摘要
高铁铝土矿是一种储量巨大的典型难选铝土矿,而煤矸石是选煤过程中产生的固体废弃物。本研究提出将高铁铝土矿与煤矸石共焙烧回收铁铝的方法。确定共焙烧的最佳条件为焙烧温度750℃、焙烧时间50 min、煤矸石配比40%及磨矿粒度<37μm的占70.55%。焙烧产品经过磁选管磁选,最终能得到总铁品位为55.09%、铁回收率为82.73%的铁精矿和Al_(2)O_(3)含量为21.67%、铝回收率达75.55%的富铝产品。物相分析表明,共焙烧过程能将高铁赤泥中的赤铁矿有效转化为磁铁矿,将一水硬铝石转化为Al_(2)O_(3)。实验表明,高铁铝土矿与煤矸石共焙烧是一种很有应用前景的铁铝回收工艺。
High-Fe bauxite is a typical refractory bauxite with extensive resources,and coal gangue is a solid waste produced during coal preparation.In this study,the co-roasting of high-Fe bauxite with coal gangue for iron and aluminum recycling was explored.The optimum conditions for co-roasting were roasting at 750℃for 50 min with 40%coal gangue,and 70.55%particles with size<37μm.Through magnetic separation,iron ore concentrate with 55.09%TFe and a recycling rate of 82.73%,and aluminum-rich products with Al_(2)O_(3)of 21.67%and a recycling rate of 75.55%were produced.Based on the analysis of materials,hematite was transformed into magnetite,and diaspore was transformed into Al_(2)O_(3)through co-roasting.Therefore,the co-roasting of high-Fe bauxite and coal gangue is a promising process for recycling iron and aluminum.
作者
袁帅
黄成
白哲
王若枫
丁浩源
YUAN Shuai;HUANG Cheng;BAI Zhe;WANG Ruo-feng;DING Hao-yuan(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming 650093,China;National and Local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China)
基金
Project(CNMRCUKF2301)supported by the Open Foundation of State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,China
Project(52174240)supported by the National Natural Science Foundation of China
Project(2021YFC2902404)supported by the National Key Research and Development Program of China
Project(N2101023)supported by the Fundamental Research Funds for the Central Universities,China。
关键词
煤矸石
高铁铝土矿
共焙烧
铁精矿
coal gangue
high-Fe bauxite
co-roasting
separation
iron ore concentrate
