注压对离子型稀土浸出及孔隙结构的影响  

Influence of Injection Pressure on the Leaching and Pore Structure of Ionic Rare Earths

作　　者：程玥淞 黄玲玲 郭敏 汪实 王钧 宫清华 袁少雄 CHENG Yuesong;HUANG Lingling;GUO Min;WANG Shi;WANG Jun;GONG Qinghua;YUAN Shaoxiong(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Guangzhou Institute of Geography,Guangdong Academy of Sciences,Guangzhou 510070,China;Guangdong Geological Survey Institute,Guangzhou 510080,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]广东省科学院广州地理研究所,广州510070 [3]广东省地质调查院,广州510080

出　　处：《有色金属工程》2023年第12期51-58,共8页Nonferrous Metals Engineering

基　　金：广东省稀土资源调查评价项目(2022-14);国家自然科学基金资助项目(42101084,42271091,41977413);广东省自然科学基金资助项目(2022A1515011898)。

摘　　要：以广东某离子型稀土矿为研究对象,选取不同孔隙比的重塑土进行室内柱浸试验,研究注压条件对离子型稀土矿浸出的影响,并采用核磁共振技术测定孔隙结构等参数。结果表明:随注压压强的增加,浸出率峰出现时间大幅度缩短,注压前期,试样内部孔隙由大孔隙和超大孔隙向小中孔隙转化;注压后期,中孔隙向大孔隙转化,而超大孔隙及微孔隙占比进一步降低。注压压强小于10 MPa时,随压强的增加,中孔隙占比呈上升趋势,变化趋势逐渐扩大;注压压强大于10 MPa时,随压强的增加,中孔隙占比呈下降趋势,变化趋势逐渐变缓。Taking an ionic rare earths ore in Guangdong as the research object,different pore ratios of heavy plastic soil were selected for indoor column leaching test to study the influence of injection pressure conditions on the leaching of ionic rare earths ore,and nuclear magnetic resonance technology was used to determine the pore structure and other parameters.The results show that the appearance time of the leaching rate peak is shortened greatly with the increase of the injection pressure.In the early stage of the injection pressure,the internal pores of the specimen are transformed from large and super large pores to small and medium pores.In the late stage of the injection pressure,the medium pores are transformed to large pores,and the percentage of super large pores and micropores is further reduced.When the pressure is less than 10 MPa,the proportion of mesopores shows an upward trend,and the change trend is gradually expanding with the increase of the pressure;when the pressure is more than 10 MPa,the proportion of mesopores shows a downward trend,and the change trend is gradually slowing down with the increase of the pressure.

关 键 词：离子型稀土 注压 渗流过程 孔隙分布 

分 类 号：TD97[矿业工程—选矿] X705[环境科学与工程—环境工程]