高铁铝土矿的强化还原焙烧—磁选除铁  

Reinforce Reduction Roasting-magnetic Separation in Removing Ferrum of High Iron Content Bauxite

作　　者：谢武明[1] 楼匡宇[1] 张文治[1] 邢瑜[1] 简静仪 刘敬勇[1] 

机构地区：[1]广东工业大学环境科学与工程学院,广州510006

出　　处：《有色金属（选矿部分）》2016年第1期26-30,共5页Nonferrous Metals（Mineral Processing Section）

基　　金：广东省大学生创新创业训练项目(1184513246;yj201311845112)

摘　　要：以高铁铝土矿为原料,在合适的温度和时间条件下利用铝土矿的煤基直接还原原理,研究Na_2CO_3和Ca F2对其中铁氧化物还原的影响,并考察磁场强度和物料粒径对磁选效果的影响。得出最佳工艺条件为反应时间为180 min,反应温度为1 150℃,还原剂投加量为25%;磁选粒度-75μm占80%,磁场强度为150 k A/m。添加3%Na_2CO_3和3%Ca F_2进行还原焙烧,磁选后铝精矿铝品位为58.8%,铁含量减少到4.0%,满足生产石油压裂支撑的原料要求。Effect of Na2CO3 and CaF2 on reduction of high iron content bauxite was studied under the suitable temperature and response time, and the excitation current and particle size effect on the magnetic separation. The results show that the best response time is 180 rain, reaction temperature is 1 150 ℃, reducing agent dosage is 25% , magnetic field intensity is 150 kA/m and the particle size which can pass 75 μm sieve accounted for 80% is the best. However, with 3% of Na2CO3 and 3% of CaF2, grade of bauxite increases to 58.8% , and iron content decreases to 4. 0%. The obtained bauxite concentrate meets the iron content level required in the production of oil fracturing propping.

关 键 词：高铁铝土矿 磁选 CAF2 NA2CO3 磁场强度 直接还原 

分 类 号：TD952.5[矿业工程—选矿]