摘要
砂岩型铀矿中镓的存在形式研究尚属空白。文章在系统开展薄片鉴定、扫描电镜观察、全岩主微量分析、原位激光剥蚀以及电子探针元素定量分析的基础上,综合元素相关性分析、宏观与微观、定性与定量相结合的逐级排除法,对八家子矿床富镓铀矿石中镓的存在形式进行了精细解剖。研究发现,八家子铀矿床绝大部分铀矿石中的镓达到铀矿床伴生元素的最低品位要求。宏观上富镓铀矿石具有杂基含量高、高岭土化等特征;微观上矿石具有镓与铝等主量元素含量强相关,微米尺度下未见独立镓矿物或镓相关矿物,原位黏土矿物镓含量存在多个高值区等特征,推断八家子铀矿床中镓的存在形式主要为吸附态,其主要吸附在以高岭土为主的黏土矿物周围。研究提供了砂岩型铀矿中镓存在形式的研究实例,同时为砂岩型铀矿中伴生镓元素的综合利用提供了技术支撑。
The occurrence and distribution of gallium in sandstone-type uranium deposits remain poorly understood.This study presents a systematic investigation of gallium in uranium ores from the Bajiazi deposit,combining whole-rock geochemistry,petrographic analysis,scanning electron microscopy(SEM),and in-situ microanalysis techniques.Our findings show that gallium concentrations in most uranium ores from Bajiazi meet the minimum grade required for co-production.The gallium-enriched ores are characterized by high clay content and extensive kaolinization.At the microscopic level,gallium demonstrates a strong geochemical affinity to aluminum,and no independent gallium minerals were identified after detecting numerous gallium-rich zones within clay minerals.These observations indicate that gallium in Bajiazi deposit exists primarily in an adsorbed form,with kaolinite serving as the principal host.This work has established a robust approach for determining gallium occurrence in sandstone-type uranium deposits and will support the potential strategies for recovering gallium as a by-product of uranium mining.
作者
李占龙
邢作昌
刘阳
王睿
张亚南
张字龙
LI Zhanlong;XING Zuochang;LIU Yang;WANG Rui;ZHANG Ya'nan;ZHANG Zilong(The Fifth Geological Exploration Institute of Heilongjiang Province,Harbin 150090,Heilongjiang,China;National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing,Beijing 100029,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China)
出处
《铀矿地质》
2025年第6期1055-1068,共14页
Uranium Geology
基金
黑龙江省嘉荫县八家子铀矿普查项目(编号:YBZQ[2023]21)
中国核工业地质局项目“漠河-佳木斯盆地群铀成矿环境与远景预测研究”(编号:202446-5)联合资助。
关键词
镓的存在形式
吸附态
黏土矿物
八家子铀矿床
gallium occurrence forms
adsorbed state
clay minerals
Bajiazi uranium deposit
