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Heap leaching gold technology

Heap leaching gold technology

【Process Introduction】:The process of heap leaching gold from gold ore is to crush low-grade gold ore to a certain size (or granulate), and pile it on a leak-proof bottom mat paved with asphalt, concrete or plastic, and use low-concentration cyanide, alkaline The solution, non-toxic solvent or dilute sulfuric acid and other solutions are sprayed on the mine pile to dissolve the gold, and the gold-containing solution is infiltrated from the mine pile, and then the gold is recovered by methods such as activated carbon adsorption or zinc powder replacement precipitation.

【Application Scope】:Heap leaching gold from gold mines is often used to develop gold mines with small ore bodies or low grades, or both, and deposits that cannot be developed and utilized by conventional methods.

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Process introduction

Process conditions

The gold extraction by heap leaching method does not require high terrain conditions, and measures can be adapted to local conditions. Permanent unloading yards or stacking yards can be set up according to the characteristics of the terrain. For example, the tops and slopes of hills are relatively gentle and open, so they are suitable for building permanent dumping yards.

Raw ore processing

The original ore is crushed to a certain particle size (30-50mm) by the jaw crusher and cone crusher produced by Xinhai, and then directly drained; or granulated (to agglomerate finer particles into coarse powder aggregates) After that, the ore is transported to the ore pile by forklift for stacking.

Heap leaching system

Set up a pile leaching system on the paved ore pile. After the cyanide solution reacts with the mine pile, the gold-containing solution (precious liquid) seeps from the bottom of the mine pile, flows into the precious liquid pool, and is pumped into the adsorption column by the precious liquid pump. Reuse of the shower system.

Extract gold from precious liquid

Use a high-efficiency, low-consumption, fast desorption electrolysis system or a zinc powder replacement device to extract the gold in the precious liquid, and obtain the product after smelting.

Production case

Take a gold mine in Yunnan as an example. The scale of the processing plant is 300t/d. The main mineral in the ore is pyrite. The grain size of gold is fine and it is closely related to metal sulfide minerals. The flotation process of the ore is one roughing, two beneficiation, and two sweeping. However, the surface of the arsenic and antimony minerals is easily oxidized and adsorbs a large amount of flotation reagents, and the flotation effect is poor, so the flotation plant Xinhai was commissioned to reform the flotation process. In response to the problems in the original production, Xinhai carried out technical transformations in combination with actual production and changed the original gold mine flotation equipment cyclone tail throwing to stage grinding and flotation, flotation throwing tails, so that the process is smooth and easy Operation, in addition, the number of equipment and flotation reagent system for certain processes have been improved, and the final results obtained are excellent.

gold ore dressing equipmentGold ore dressing production line

Process Equipment

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