Rakesh, only Group 1 & 2 ...

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Rakesh, only Group 1 & 2 metals form soluble sulfides (probably do not occur in acid mine drainage), the rest are insoluble. I am assuming that the sulfide moiety we are mainly dealing with is dissolved H2S. This can be precipitated or immobilized as Iron sulfide or free sulfur as long as the acidity has been neutralized with lime or limestone. The acid insoluble "heavy metal sulfides" are valuable & maybe worth recovery. I do not think it is a good idea to degas as H2S is so toxic.