Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
MEASUREMENT OF OXYGEN CONSUMPTION AND DIFFUSION IN EXPOSED AND COVERED REACTIVE MINE TAILINGS1
 

Summary: MEASUREMENT OF OXYGEN CONSUMPTION AND DIFFUSION IN
EXPOSED AND COVERED REACTIVE MINE TAILINGS1
Vincent Martin 2
, Michel Aubertin, Bruno Bussière, Mamert Mbonimpa, Anne-Marie Dagenais,
Mathieu Gosselin
Abstract. When sulphidic tailings are exposed to atmospheric conditions, oxygen
can flow in the material where it will be consumed by oxidation reactions. This
paper presents results from a project studying the in situ oxygen diffusion and
consumption in tailings. It provides measured values for the oxygen reaction rate
Kr and the effective diffusion De coefficients based on oxygen consumption and
diffusion tests that are performed under various conditions. Based on the test
results, the Kr and De values determined in situ are compared to values obtained
through simple predictive models. Results indicate that the value of these two
parameters is influenced by factors such as the degree of saturation Sr and in situ
porosity n. A lower Sr or a higher n may increase the oxygen flux toward the
reactive tailings, which can increase the production rate of acid mine drainage
(AMD).
Additional Key Words: Acid Mine Drainage, Mine Tailings, Fick's Laws,
Oxygen Fluxes, Reaction Rate.
______________________

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies