[Introduction]: A system extracts gold from pregnant solution by zinc powder
[Improvement]: Zinc powder displacement process is composed of pregnant solution purification, deoxidation and zinc powder filtering replacement
With even and continuous spiral feeding, it has solved the problems of difficulty in adjusting zinc powder feeding amount in traditional machinery and uneven feeding amount, and reduced the residual zinc content, which not only reduces the production costs, but also improves the smelting effects;
With small area of zinc exposure in the air, the oxidation of the zinc powder is reduced in the operation, and the replacement effect is improved.
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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