Powdered zinc substitution method is developed on the basis of a zinc substitution process on the wire, is the main method of pregnant solution containing the gold extracting gold from cyanide.
The zinc powder replacement process consists of three operations: purification of noble liquid, deoxidation and replacement of zinc powder.
Purification operation The purpose of this operation is to remove the suspended solids in the precious liquid and prevent it from entering the replacement operation, affecting the displacement effect and the quality of the gold mud. Therefore, the lower the suspended matter content in the precious liquid after purification is required, the better.
The equipment used for purification can be divided into two categories: one is vacuum suction type, such as plate and frame type vacuum filter; the other is pressure filter type, such as plate and frame filter press, tube filter and star filter.
Deoxidation operation Dissolved oxygen in the noble liquid is harmful to zinc gold, so it must be removed. The equipment used for the replacement of vacuum deaeration tower, in which the degree of vacuum is generally 680 to 720 mmHg, the oxygen content can pregnant solution to 0.5 g / m 3 or less.
Zinc powder replacement operation This operation consists of two parts, namely the addition and replacement of zinc powder. The addition of zinc powder requires accurate addition, rapid and continuous addition, and avoids oxidation of zinc powder and moisture agglomeration. Zinc powder addition is accomplished by a combination of a zinc powder feeder and a zinc powder mixer. Zinc powder is added with a belt conveyor, a disc feeder and various vibrating feeders. The mixer requires a level control.
When zinc powder is added to the noble liquid, the displacement reaction begins, and the final displacement and gold mud filtration are performed by the replacement machine. Commonly used replacement machines are plate and frame filter presses, displacement filters or bag displacers.
Purification, deoxidation and replacement operations should be carried out continuously in the production process, avoiding intermediate interruptions. The purification of the noble liquid from decontamination to deoxidation is mainly carried out by vacuum suction, and the replacement of the noble liquid after deoxidation is caused by the pumping of the air seal. Send, the entire zinc powder replacement system for the external air sealing system, air leakage will destroy the normal operation of the system.
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