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Zinc Powder Displacement Process Flow
DETALLES
| Introducción detallada
Process Introduction
Zinc powder displacement is one of the earliest cyanidation methods. First, cyanide is added to the slurry to leach gold minerals; then, solid-liquid separation is carried out. In the liquid phase—known as the gold-rich solution—zinc powder or zinc wire is added, triggering a chemical reaction that causes gold and silver to precipitate into a gold-silver concentrate. This concentrate, which contains a high proportion of gold and silver, is subsequently smelted to produce high-purity gold ingots. Currently, this process remains a widely adopted cyanidation method for treating flotation concentrates and other gold ores.
Process flow
1. Stirred Leaching—The leaching of gold is primarily carried out in a leaching tank. Under the action of an impeller and compressed air, the cyanide-containing slurry is vigorously stirred, which helps to enhance the leaching efficiency.
2. Countercurrent washing—a process widely adopted in cyanide plants—typically involves multiple single- or multi-layer thickeners. The purpose of countercurrent washing is to feed the clear water from the upper stage of one thickener into the lower stage of the preceding thickener, thereby “diluting” the slurry and gradually reducing the gold concentration in the liquid phase until it reaches a predetermined standard. Countercurrent washing is a process of “diluting” and concentrating the slurry.
3. Zinc Powder Displacement—This process involves adding a metallic reducing agent (zinc powder) to the cyanide-rich solution, where a chemical reaction causes gold and silver to precipitate as gold mud. Typically, this process includes stages such as deoxygenation of the rich solution, addition of zinc powder and lead acetate, and filtration under pressure to produce gold mud.
Image Association Diagram
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