摘要
为探究浸矿母液侵蚀作用下离子型稀土矿基岩内部孔隙变化,对浸矿母液浸泡下的基岩试样进行了室内模拟试验,检测基岩试样的组成成分,测试不同浸泡时间后试样的P波波速和质量变化,分析浸矿母液pH变化和化学作用,结合核磁共振试验结果,研究了浸矿母液侵蚀作用下基岩孔隙演化规律。试验结果表明,在0~150天的试验期阶段,试样的质量及P波波速呈现减小后反弹的变化趋势,其变化可能与试样内部被浸矿母液侵蚀溶解及浸矿母液存在反应沉淀吸附物有关;浸矿母液与试样存在侵蚀溶解和沉淀吸附反应,侵蚀溶解导致试样内部孔隙增加,而沉淀吸附反应导致沉淀吸附物填补孔隙;浸矿后,基岩试样内部孔隙分布以中孔隙居多,小孔隙次之,大孔隙近乎减小为零;中孔隙随浸泡时间呈现先增加后减小的趋势,而小孔隙先减小后增加。试验结果可为进一步探究浸矿母液侵蚀作用下的离子型稀土矿基岩力学行为提供一定程度的理论参考。
In order to investigate the internal pore changes of ionic rare earth deposit bedrock with the chemical interaction of leaching liquor,laboratory simulation experiments were conducted on the bedrock specimens with the corrosion of leaching liquor.The composition of bedrock specimens was detected,the P wave velocity and mass change of specimens with different soaking durations were tested,and the pH change and chemical interaction of leaching liquor were analyzed.Combined with the NMR test results,the evolution of bedrock pores under the chemical interaction of leaching liquor was studied.The results show that:during the experiment duration of 0 to 150 days,the mass of the specimen and the P-wave velocity show a tendency to rebound after decreasing.The change may be related to the corrosion and dissolution of the specimen by the leaching liquor and the presence of reactive precipitated adsorbents in the leaching liquor;There are dissolution and precipitation adsorption reactions between the leaching liquor and specimens.Erosion dissolution leads to the increase of internal pores of specimens,while the precipitation adsorption reaction between the leaching liquor and specimens leads to the filling of pores by precipitated adsorbents;After leaching,the distribution of pores inside the bedrock specimen is mostly mesopores,followed by micropores,and macropores are almost reduced to zero.The mesopores first increased and then decreased with the soaking time,while the micropores first decreased and then increased.The experimental results can provide a necessary theoretical reference for further investigating the mechanical behavior of ionic rare earth deposit bedrock under chemical interaction of leaching liquor.
作者
罗建林
欧阳健
钟文
范婷
肖长波
王晓军
郭钟群
胡凯建
LUO Jian-lin;OUYANG Jian;ZHONG Wen;FAN Ting;XIAO Chang-bo;WANG Xiao-jun;GUO Zhong-qun;HU Kai-jian(School of Resources&Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Key Laboratory of Mining Engineering of Jiangxi Province,Ganzhou 341000,China;Jiangxi College of Applied Technology,Ganzhou 341000,China;Deep Vein Group Mine Intelligent Mining Technology Innovation Center of Ganzhou,Ganzhou 341000,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;Jiangxi Zhongliang Blasting Engineering Co.,Ltd.,Pingxiang 337000,China;Municipal Engineering Branch of Zhongding International Engineering Co.,Ltd.,Nanchang 330000,China)
出处
《稀土》
CAS
CSCD
北大核心
2022年第4期55-63,共9页
Chinese Rare Earths
基金
国家自然科学基金项目(51764014,51874148,51904119,52004106)
江西省自然科学基金项目(20192BAB206018)
中国博士后科学基金项目(2017M622099)
江西省博士后科研项目择优资助项目(2018KY03)
岩土力学与工程国家重点实验室开放研究基金项目(Z017024)
江西省青年井冈学者计划项目(QNJG2019054)
赣州市创新领军人才计划项目(【2020】60)
江西省研究生创新专项资金项目(YC2020-S436)
关键词
离子型稀土
基岩
浸矿侵蚀
孔隙
核磁共振
ionic rare earth
bedrock
leaching erosion
pore
nuclear magnetic resonance
