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Hello,

There several possible goals in reducing acid mine drainage. One goal is keep the sulphides from breaking down in to soluble sulfur which allows it to form the sulphates you mention. Another would be to capture as much of the sulphide bearing mineral and remove it if that is possible in your process? One method is to try to get the water as close to neutral pH as possible. Lime and/or limestone addition is a cheap way to do this.

 

Of course all this is very dependent on the chemistry of the minerals and water in your process.

Below are a couple articles on acid mine drainage.

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.595.4733&rep=rep1&type=pdf

https://brownfieldstsc.org/pdfs/amdinnovativetrttech_03.pdf

 

There are also bio-remediation methods using bacteria for removing sulpides as in the article below.

https://clu-in.org/download/studentpapers/S_Doshi-SRB.pdf