Preparation of titanium mineral from vanadium titanomagnetite concentrates by hydrogen reduction and acid leaching  

氢还原-酸浸法从钒钛磁铁精矿中制备钛富集矿物

作　　者：Zheng-pei YAN Ying ZHANG Shi-li ZHENG Yang ZHANG Pei SUN Zi-wei SONG Faiza SAFDAR Tao QI 颜正培;张盈;郑诗礼;张洋;孙沛;宋紫微;Faiza SAFDAR;齐涛(中国科学院大学,北京100049;中国科学院过程工程研究所战略金属资源绿色循环利用国家工程研究中心中国科学院绿色过程与工程重点实验室,北京100190;School of Materials Science and Engineering,University of Utah,Utah 84112,USA;燕山大学环境与化学工程学院河北省应用化学重点实验室,秦皇岛066004)

机构地区：[1]University of Chinese Academy of Sciences,Beijing 100049,China [2]CAS Key Laboratory of Green Process and Engineering,National Engineering Research Center of Green Recycling for Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [3]School of Materials Science and Engineering,University of Utah,Utah 84112,USA [4]Hebei Key Laboratory of Applied Chemistry,College of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第9期3099-3109,共11页中国有色金属学报（英文版）

基　　金：financially supported by the Beijing Natural Science Foundation, China (No. 2192056);the National Natural Science Foundation of China (No. 51771179);the National Key R&D Program of China (No. 2018YFC1900505);The financial supports from the Youth Innovation Promotion Association CAS and the CAS Interdisciplinary Innovation Team

摘　　要：Titanium mineral was prepared from vanadium titanomagnetite concentrates by hydrogen reduction and acid leaching.The leaching behaviors of elements like Fe,V,Mn,Al,Mg,Ca,and Si were highly related to the reduction degree.The phase compositions of the reduced materials and the leached residues were analyzed by XRD to identify the effect of reduction degree on the leaching mechanisms.The results showed that the concentrates were reduced to iron metal and titanomagnetite at 800-1000°C for 0.5 h,and the above elements of Fe and impurities were easily leached.Deeper reduction led to the formation of ilmenite and Mg-Al spinel,which hindered leaching.Mg-bearing anosovite appeared in the further reduced materials,and the leaching rates of impurities became much lower.An upgraded titanium mineral with a normalized TiO_(2) grade of 70.3%was achieved by H_(2) reduction at 850°C for 0.5 h and acid leaching,which is a satisfactory Ti resource for the preparation of titanium oxide by sulfate process.采用氢还原-酸浸法从钒钛磁铁精矿中制备钛矿物。还原料中Fe、V、Mn、Al、Mg、Ca和Si等元素的浸出行为与还原度密切相关。利用XRD法分析还原料与浸出渣的物相组成,确定还原度对浸出机理的影响。结果表明,在800~1000℃下保温0.5 h,精矿被还原为金属铁和钛磁铁矿相,铁和各杂质元素易浸出。深度还原使还原料中生成钛铁矿和Mg-Al尖晶石相,从而阻碍铁和杂质元素的浸出。更深度的还原导致含镁黑钛石的生成,显著降低杂质元素的浸出率。精矿经氢气在850℃下还原0.5 h并酸浸后,可获得归一化TiO_(2)品位达70.3%的钛富集矿物,是硫酸法生产钛白粉的理想原料。

关 键 词：vanadium titanomagnetite titanium mineral hydrogen reduction acid leaching phase change 

分 类 号：TF823[冶金工程—有色金属冶金]