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The effects of acid mine drainage on the erosion of carbonatite in carbonate rocks.

XIA Yu1, WU Pan1,2,3*, ZHANG Rui-xue1,2, ZHU Jian1,2, WANG Yue-zhu1, SONG Chuan-xiao1, LI Ling4   

  1. (1College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China; 2Key Laboratory of Process and Control of Mining Environmental Pollution, Colleges and Universities in Guizhou Province, Guiyang 550025, China; 3Key Laboratory of Karst Environment and Geohazard, Ministry of Land and Resources, Guizhou University, Guiyang 550025, China; 4Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China).
  • Online:2018-06-10 Published:2018-06-10

Abstract: We quantified the effects of acid mine drainage on the erosion rate of seven carbonate rocks with different ages, to screen for appropriate passive packing. The results showed that the mean erosion rate of carbonate rocks in response to acid mine drainage was 4.88×10-4 g·cm-2·d-1 in 60 days, which is at least ten times faster than karst water erosion. The calcite Mesocrystalline dolomite in Baizuo Formation showed higher erosion rate than other limestones. The microstructure and the composition of rock surface material were measured by Scanning Electron Microscope and Energy Dispersive Spectrometer. It was found that the iron oxides on the surface of rocks from different ages were lepidocrocite. The crystallization rate of calcium sulfate on rock surface was one of the key factors controlling the erosion rate of carbonatite in carbonate rocks. Additionally, the dissolution of magnesium carbonate was an important factor driving the crystallization rate of calcium sulfate.

Key words: microchemistry, effect evaluation, common carp (Cyprinus carpio), otolith, fish enhancement and releasing