Insight into the structural evolution of porous and fractured media by forced aeration during heap leaching  

作　　者：Yu Shaofeng Wu Aixiang Wang Yiming 

机构地区：[1]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Key Laboratory of High-Efficient Mining and Safety of Metal,Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Mining Science and Technology》2019年第5期803-807,共5页矿业科学技术学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51374035);the Foundation for the Author of National Excellent Doctoral Dissertation of PR China(No.201351);the Program for New Century Excellent Talents in University of China(No.NCET-13-0669).

摘　　要：Despite lots of techniques in improving the heap leaching performance,many constraints on the industrial applications remain.We proposed a correspondingly effective and new idea of introducing forced aeration to improve the bad permeability and leaching effect of Yangla Copper Mine(YCM)during heap leaching.The dual-media theory was employed to study the impact mechanism of forced aeration on the variations of porous and fractured media during the column leaching experiments.An X-Ray Computed Tomography(CT)set was utilized to perform the pore imaging of the specimens and the fracture morphology of the particles within the columns was analyzed by Scanning Electron Microscope(SEM)as aeration rate(AR)changed.The results show that there exists copious fine particles within the heap of YCM,the particle size distribution of which is not reasonable.The forced aeration can not only promote the development of the porous and fractured structures but effectively break the blocked seepage paths.Then the leaching degree is improved and the seepage performance of the solute within the solution is enhanced.Therefore,the forced aeration is probable of making the leaching performance greatly improved.

关 键 词：LEACHING performance FORCED AERATION POROUS and fractured MEDIA CT SEM AERATION rate 

分 类 号：TF111.3[冶金工程—冶金物理化学]