1． Pregnant solution purification: Gold pregnant solution often contains suspended solids which should be removed before replacement. Pregnant solution purification is the process to remove suspended solids.
2． Deoxidation: Dissolved oxygen in pregnant solution hinders displacement of zinc and gold.
3．Displacement and filtering: Including 2 steps adding zinc powder and displacement; when adding the zinc into pregnant solution, the displacement action starts. The displacement equipment finishes the displacement and gold mud filtration.
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