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Envirogold files refractory ore treatment patent

PROCESSING technology company Envirogold Global has filed a patent for its process to recover metals from refractory ores while completely neutralising the acid-forming potential of waste.

Noel Dyson
The NVRO process is to be applied to the Hellyer tailings.

The NVRO process is to be applied to the Hellyer tailings.

Called the NVRO Process it uses a two-stage acid leach with one-hour acid residency times in which the acid is a catalyst so little of the acid is consume in the reaction. An acid recycling circuit serves...

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