Strategies for Reduced Acid and Metalliferous Drainage by Pyrite Surface Passivation

Strategies for Reduced Acid and Metalliferous Drainage by Pyrite Surface Passivation

Acid and metalliferous drainage (AMD) is broadly accepted to be a major global environmental problem facing the mining industry, requiring expensive management and mitigation. A series of laboratory-scale kinetic leach column (KLC) experiments, using both synthetic and natural mine wastes, were carried out to test the efficacy of our pyrite passivation strategy (developed from previous research...

Pyrite Passivation by Triethylenetetramine: An Electrochemical Study

The potential of triethylenetetramine (TETA) to inhibit the oxidation of pyrite in H(2)SO(4) solution had been investigated by using the open-circuit potential (OCP), cyclic voltammetry (CV), potentiodynamic polarization, and electrochemical impedance (EIS), respectively. Experimental results indicate that TETA is an efficient coating agent in preventing the oxidation of pyrite and that the inh...

Acid Mine Drainage: Flow-Through Experiments Examining Pyrite Dissolution Rates

Control of Acid Generation from Pyrite Oxidation in a Highly Reactive Natural Waste: A Laboratory Case Study

Laboratory kinetic leach column (KLC) tests were carried out to define the conditions required to control acid generation from a highly reactive, potentially acid-forming (PAF) iron ore waste rock. It was found that lime addition (0.1 wt % blended) plus either blending of silicates (25 wt % K-feldspar and 25 wt % chlorite), or addition of a non-acid forming (NAF) top cover containing about 10% ...

Evaluation of Dilution Processes in Streams Affected by Acid Mine Drainage in the Iberian Pyrite Belt