碳酸钠焙烧铝系钒铁炉渣共提取钒与铝  

Recovery of Vanadium and Aluminum in Ferrovanadium Slag from Thermite Method by Sodium Carbonate-roasting

作　　者：高明磊[1] 陈东辉[1] 石立新[1] 李兰杰[1,2] 周冰晶[1] 祁健[1] 

机构地区：[1]河北钢铁股份有限公司承德分公司钒钛工程技术研究中心,河北承德067102 [2]中国科学院过程工程研究所,北京100190

出　　处：《过程工程学报》2012年第4期576-582,共7页The Chinese Journal of Process Engineering

基　　金：国家科技支撑计划基金资助项目(编号:2012BAE06B04)

摘　　要：通过对铝系钒铁炉渣碳酸钠焙烧-水浸全过程的矿物分析、热力学计算及对比实验,研究了炉渣中钒、铝同步转化、溶出的机理与规律.结果显示,焙烧进程中渣中镁铝尖晶石MgO·Al2O3相、CaO2Al2O3相逐渐消失,MgO相生成,并生成碱熔相Na2O·Al2O3和钒酸盐.随焙烧温度及时间增加,Na2O·Al2O3和钒酸盐相明显增多,钒、铝溶出率增加.焙烧熟料经水浸后,液相呈碱性,钒、铝分别以可溶性钒酸钠和铝酸钠的形式进入水相,固相残留物为少量未反应的镁铝尖晶石及新生成的MgO和Ca(OH)2.在磨矿粒度<75 μm、配碱系数1.0、焙烧温度1000℃及焙烧时间4h的优化条件下,钒的溶出率可达90%,铝的溶出率可达75%.By mineralogical analysis,thermodynamic calculation,and comparative experiments,the synchronous conversion of vanadium and aluminum was studied,and dissolving mechanism in the process of sodium carbonate roasting and water leaching on ferrovanadium slag.The results showed that magnesia-alumina spinel（MgO·Al2O3） and CaO·2Al2O3 phases gradually disappeared,and MgO phase,alkali melting phase of Na2O·Al2O3 and phase vanadate were generated in the roasting process. Na2O·Al2O3 and vanadate phases increased obviously with the increase of roasting temperature and time,resulting in the dissolution increase of vanadium and aluminum. Vanadium and aluminum,in vanadate and sodium aluminate,could be dissolved into water solution,as the solution was alkaline when the clinker was leached by water.The solid residues were a small amount of unreacted magnesia-alumina spinel and new generated MgO and Ca（OH）2.The optimum roasting conditions were obtained as follows：grinding particle size below 75 μm,molar ratio of Al2O3 and V2O5 to Na2CO3 1：1,roasting temperature 1000℃ and roasting time 4 h.Under these conditions,the leaching rates of vanadium and aluminum were up to 90% and 75%,respectively.

关 键 词：铝系钒铁炉渣 钒 氧化铝 碳酸钠焙烧 溶出 

分 类 号：TF814.3[冶金工程—有色金属冶金]