Heap leaching is one of the most direct and effective methods for processing low-grade gold ore.The key to improving the recovery rate of heap leaching is to enhance the permeability of the heap, so that the leaching solution can fully contact and react with the free gold in the ore. How to increase the oxygen content in the gold leaching process is also an important condition for improving the leaching rate. Therefore, in order to improve the technical indicators in the heap leaching process, especially for the treatment of refractory gold ores, such as fine-grained and muddy ores, the In the leaching process, the technological transformation of ore granulation, adding wetting agent and oxygen leaching was carried out to achieve the purpose of improving the gold recovery rate.
Gold ore heap leaching is to crush low-grade gold ore to a certain particle size (or granulate), and accumulate it on a leak-proof bottom pad made of asphalt, concrete or plastic sheeting, and use low-concentration cyanide, alkaline solution, The non-toxic solvent or dilute sulfuric acid and other solutions are sprayed on the ore heap to dissolve the gold, and the gold-containing solution is percolated from the ore heap, and then the gold is recovered by activated carbon adsorption or zinc powder replacement and precipitation.
Heap leaching process introduction
Application
Heap leaching method is often used to develop low-grade gold mines. Heap leaching method for gold extraction has the advantages of simple process, easy operation, low energy consumption, low investment and quick effect. The scale can be large or small, and the largest single pile of ore can reach more than one million tons.
Process flow
The production process of heap leaching gold extraction is mainly composed of the construction of heap leaching sites, the pretreatment of ore (crushing or granulating), heap building, spray leaching, recovery of gold in gold-containing precious liquid, and disinfection and unloading of waste ore heaps. part composition.
1.Raw ore processing:After the raw ore is crushed to a certain particle size (30-50mm) with a jaw crusher and a cone crusher, it is directly piled; The ore is transported to the ore heap by forklifts for stacking.
2.Sprinkler System:On the laid mine pile, set up a spray system. After the cyanide solution reacts with the mine pile, the gold-containing solution (precious liquid) seeps out from the bottom of the mine pile, flows into the noble liquid pool, and is pumped into the adsorption column by the noble liquid pump. Reuse of the shower system.
3.Desorption electrolysis:After the precious liquid is desorbed and electrolyzed by high temperature and high pressure, gold mud is obtained, and the gold mud is smelted to finally obtain high-purity gold ingots.
The main equipment of heap leaching plant includes jaw crusher, cone crusher, spray device, analytical electrolysis equipment, smelting equipment, etc.
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