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You might want to try the folks at Boliden. I believe that they have dealt extensively with the issues related to the management of acidic tailings. In addition, they have experience with the problems posed by the degradation of thiosalts. You may want to refernce the proceedings from the...

Please correct me if I'm wrong, but due to safety concerns, I believe that use of PVC for carrying compressed air above ground is not allowed within North America.

Bisulphite/sulphite can be formed by contacting the SO2 stream with caustic in a packed tower. This is typically done after the gas stream is quenched. By maximising the SO2 strength ~18%, you will maximize your solution strength. The supplier of your sulphur burning system will likely be able...

There is some good information on sulphur burning systems on the web and in litterature. You might want to reference information on sulphur products and sulphuric acid production. There are a number of different designs that can be used and the one chosen will greatly depend upon your...