中国磁性铁矿石全铁品位和磁性铁品位关系及其意义  

Relationship between total iron grade and magnetic iron grade of Chinese magnetic iron ores and its significance

作　　者：李厚民[1] 戢兴忠 毕珉烽 李立兴[1] 李小赛[1] 倪善芹[1] LI HouMin;JI XingZhong;BI MinFeng;LI LiXing;LI XiaoSai;NI ShanQin(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]自然资源部成矿作用与资源评价重点实验室,中国地质科学院矿产资源研究所,北京100037

出　　处：《矿床地质》2023年第4期729-740,共12页Mineral Deposits

基　　金：国家重点研发计划项目(编号:2022YFC2903701、2022YFC2905400);中国地质调查局项目(编号:DD20190606);国家自然科学基金项目(编号:42072112)联合资助。

摘　　要：中国铁矿以可磁选的低品位磁性铁矿石为主,但是圈定铁矿体多以全铁品位为依据。文章整理了矿产资源储量数据库中磁性铁矿石的全铁品位及其对应磁性铁品位数据,筛选出493组数据,建立了沉积变质型、岩浆型、火山岩型、矽卡岩-热液型铁矿床磁性铁矿石的全铁(TFe)品位与磁性铁(mFe)品位关系式,全部493组数据为mFe(%)=0.9077TFe(%)-3.1442,沉积变质型铁矿为mFe(%)=0.8605TFe(%)-1.8275,火山岩型铁矿为mFe(%)=0.6669TFe(%)+2.6842,矽卡岩-热液型铁矿为mFe(%)=0.9320TFe(%)-3.2442,岩浆型铁矿为mFe(%)=0.8799TFe(%)-3.0174。假定铁矿石的全铁品位为20%和25%时,根据这些关系式估算的磁性铁品位与地质行业规范的边界品位(w(TFe)≥20%,w(mFe)≥15%)和最低工业品位(w(TFe)≥25%,w(mFe)≥20%)十分一致。磁性铁品位的估算,对评价铁矿资源的可利用性、进行国际对比和研究保障程度具有重要参考价值。Iron resources in China are characterized by low-grade magnetic iron ores.However,the total iron grade is used as the basis for delineating of iron orebodies.This paper summarized the total iron grade and its corresponding magnetic iron grade of the magnetic iron ores of the Reserve Database for Mineral Resources,where filtered out 493 pairs of available data sets,and established the relation formulas of total-magnetic iron grade for magnetic iron ores of the total data sets(mFe(%)=0.9077TFe(%)-3.1442),the sedimentary-metamorphic type(mFe(%)=0.8605TFe(%)-1.8275),the magmatic type(mFe(%)=0.8799TFe(%)-3.0174),the volcanic-rock hosted type(mFe(%)=0.6669TFe(%)+2.6842)and the skarn-hydrothermal type(mFe(%)=0.9320TFe(%)-3.2442).Assuming total iron grades to 20%and 25%,the calculated magnetic iron grade using the formulas above are remarkably consistent with the boundary grade(w(TFe)≥20%and w(mFe)≥15%),the minimum industrial grade(w(TFe)≥25%and w(mFe)≥20%)in the Geological Industry Specification.This study indicates that the estimation of magnetic iron grade has important reference value for evaluating the availability of iron ore resources,conducting comparison at home and abroad and studying degree of resource security.

关 键 词：地质学 全铁品位 磁性铁品位 磁铁矿石 钒钛磁铁矿石 铁矿 

分 类 号：P618.31[天文地球—矿床学]