Danfoss drives have been chosen to run the agitators in a highly precise mini plant operation and a 20 m³ test reactor involving live bacte- ria, which is used in the refining of refractory sulphide gold ores. Some 20 years ago a bio-oxidation technology was being developed as an alternative to conventional refrac- tory processes for gold recovery. Unlike conventional gold ore, the gold contained in refractory (or com- plex) ores is enca

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