白云鄂博尾矿一步法焙烧实验研究  

Experimental Study on One-Step Roasting of Bayan Obo Tailings

作　　者：郑强 吴文远 边雪 ZHENG Qiang;WU Wen-yuan;BIAN Xue(School of Metallurgy,Northeastern University, Shenyang 110819, China.)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2018年第2期205-210,共6页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究计划项目(2012CBA01205);中央高校基本科研业务费专项资金资助项目(N150204019)

摘　　要：采用差热分析(TG-DTA)和X射线衍射(XRD)方法研究了C-Ca(OH)2-Na OH体系焙烧白云鄂博尾矿的过程,考察了焙烧温度、焙烧时间、煤用量、Ca(OH)2用量及Na OH用量对尾矿中稀土矿分解和赤铁矿还原的影响.结果表明:在焙烧温度为650℃,焙烧时间为60 min,煤加入量为2%,Ca(OH)2加入量为4%,Na OH加入量为2%的条件下,赤铁矿可以有效地还原为磁铁矿,还原磁化率为2.37;同时,稀土矿有效地分解成稀土氧化物,稀土浸出率达98.39%.The roasting process of Bayan Obo tailings in C-Ca（ OH） 2-NaOH was investigated by means of thermogravimetric and differential thermal analysis（ TG-DTA） and X-ray diffraction（ XRD）. The influences of the roasting temperature,roasting time,coal content,Ca（ OH） 2 dosage and NaOH dosage were explored on the decomposition of rare earth minerals and the reduction of hematite. The results showed that the hematite was reduced to magnetite（ magnetic susceptibility： 2. 37） and the rare earth minerals were decomposed by forming rare earth oxides（ the leaching ratio of REO： 98. 39%） under the optimal conditions. The optimal conditions were as follows： the roasting temperature of 650 ℃,the roasting time of 60 min,the coal content of2%,Ca（ OH） 2 dosage of 4% and NaOH dosage of 2%.

关 键 词：白云鄂博尾矿 稀土矿 赤铁矿 分解 焙烧 

分 类 号：TF046.2[冶金工程—冶金物理化学]