宁芜盆地玢岩型铁矿尾矿元素与矿物组成特征  

Element and Mineral Characteristics of Tailings in the Porphyry-Type Iron Deposit from Ningwu Basin

作　　者：鲁银鹏 孟郁苗 黄小文[2] 王丛林 杨秉阳 谭侯铭睿 谢欢 LU Yinpeng;MENG Yumiao;HUANG Xiaowen;WANG Conglin;YANG Bingyang;TANHOU Mingrui;XIE Huan(College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;Nanshan Mining Co.,Ltd.,Anhui Ma Steel Mining Resources Group,Ma’anshan 243033,China)

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵州贵阳550081 [3]安徽马钢矿业资源集团南山矿业有限公司,安徽马鞍山243033

出　　处：《岩矿测试》2024年第2期259-269,共11页Rock and Mineral Analysis

基　　金：国家自然科学基金项目(42073043);贵州省科技计划项目(黔科合基础-ZK[2023]重点050);中国科学院“百人计划”项目。

摘　　要：宁芜盆地玢岩型铁矿是中国重要的铁资源来源,其尾矿成分复杂,而对复杂尾矿进行高效综合利用的前提是充分了解其工艺矿物学特征。本文以宁芜盆地和尚桥铁矿床尾矿样品为研究对象,在常规X射线荧光光谱(XRF)、电感耦合等离子体质谱(ICP-MS)、粉晶X射线衍射(XRD)分析的基础上,借助综合矿物分析仪(TIMA),对尾矿的矿物与化学组成、元素赋存状态、矿物粒度分布、嵌布关系以及解离度和连生关系进行分析。结果表明:尾矿的主量元素为SiO_(2)(47.18%~50.08%)、Fe_(2)O_(3)(15.40%~17.91%)和Al_(2)O_(3)(12.12%~13.34%);微量元素中Cu、Zn、V含量较高,但均未达到其工业品位;矿物组成主要为钠长石(23.26%~24.58%)、赤铁矿和磁铁矿(17.30%~21.99%)以及石英(15.31%~17.08%),总体以脉石矿物为主,金属矿物较少。Si主要赋存于石英(平均值为33.89%)与钠长石(平均值为33.75%)中;Fe主要赋存于赤铁矿和磁铁矿(平均值为73.56%)中;有害元素S主要赋存于黄铁矿中(平均值为96.86%)。尾矿粒度较细,主要分布于50~2000μm;矿物嵌布关系较为复杂且嵌布粒度较细;矿物解离度较低,大部分低于10%,单体颗粒较少,连生关系复杂。宁芜盆地玢岩型铁矿尾矿与中国其他类型铁矿尾矿相比,具有高铝的特征,黄铁矿含量相对较高。The porphyrite-type iron deposit in Ningwu Basin is an important source of iron resources in China,and the premise for the efficient and comprehensive utilization of its complex tailings is a thorough understanding of their mineral processing characteristics.In order to provide a reference for the comprehensive utilization of porphyrite-type iron deposit tailings in Ningwu Basin,the process mineralogy characteristics were explored by using the combined methods of X-ray fluorescence spectrometry(XRF),inductively coupled plasma-mass spectrometry(ICP-MS),X-ray diffractometry(XRD),and TESCAN integrated mineral analyzer(TIMA).The results show that the tailings are composed of mainly Si,Fe and Al.The mineral compositions are mainly albite,hematite,magnetite and quartz.Silicon mainly occurs in quartz and albite,whereas Fe mainly occurs in hematite/magnetite.The tailings have a fine particle size and low mineral liberation degree.Compared to other types of iron deposit tailings in China,these tailings are characterized by a high content of Al and a relatively high proportion of pyrite.

关 键 词：铁矿尾矿 玢岩型铁矿 X射线荧光光谱 电感耦合等离子体质谱 粉晶X射线衍射 综合矿物分析仪 元素赋存状态 矿物组成 

分 类 号：P595[天文地球—地球化学] P579[天文地球—地质学]