Gekko’s dedication to designing energy-efficient flowsheets includes exploiting the importance of gangue rejection.
Gangue rejection is the process of separating and disposing the poorest, low-quality, low-value material in an ore feed prior to further downstream processing. Simply put, the focus is on the waste to reject, rather than the mineral to recover.
Economic benefits are gained when the gangue volume is replaced with useful material of a higher grade. The energy expended by the subsequent operations is used more efficiently to process more valuable material. It does not waste energy on gangue.