Formative mechanism of preferential solution flow during dump leaching

  • Wu Ai-xiang Email author
  • Yin Sheng-hua 
  • Liu Jin-zhi 
  • Yang Bao-hua 


Preferential flow is a rapid movement of solution through pores caused by coarse ores. Macropore is the main factor for the preferential flow. Macropore can be defined from three aspects. Segregation of the ores during dumping was studied according to particle kinematics. Small ores become smaller under the effect of acid and weathering. Clay in the rainwater from the hillside precipitates in the dump. Segregation and fine ores are the main causes in macropore. The permeability in coarse ores is better than that in fine ores. The mechanism in the preferential flows was studied combining the fast conducting effect of the macropore. Experimental result shows that, at certain application rate, fine ore area is saturated while large volume of solution flows laterally to the coarse ore area and leaks out quickly through the macropores. Thus the mechanism of preferential solution flows is further illustrated.

Key words

macropore segregation sliming permeability preferential solution flow 

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Copyright information

© Science Press 2001

Authors and Affiliations

  • Wu Ai-xiang 
    • 1
    Email author
  • Yin Sheng-hua 
    • 1
  • Liu Jin-zhi 
    • 2
  • Yang Bao-hua 
    • 2
  1. 1.School of Civil and Environment EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.School of Resources and Safety EngineeringCentral South UniversityChangshaChina

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