[Gold Mineral Processing] Analysis of the Gold Extraction Process by Heap Leaching!

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The heap leaching gold extraction method is one of the more direct and efficient methods for processing low-grade gold ore. It has the advantages of on-site gold extraction, simple process, easy operation, and high gold recovery rate. So how to use heap leaching to process gold ore? The following will give you a detailed introduction to the Gold Mine Heap Leaching Gold Extraction Process process.

The conventional heap leaching gold extraction process mainly includes: crushing and screening, ore stacking, dosing and spraying, activated carbon adsorption, gold-loaded carbon desorption and electrolysis. part. The specific process flow is introduced as follows:

Step 1: Crushing and screening process for heap leaching of gold

In order to improve the heap leaching efficiency of gold mines, < strong>Two stages and one closed-circuit screening and crushing process. The main process is:

The raw gold ore stored in the raw ore bin enters through the trough feederJaw Crusher for coarse crushing. The coarsely crushed products enter the vibrating screen via a belt conveyor for processing. Ore that meets the particle size requirements enters the next step of the heap leaching process, while the oversize material needs to re-enter the cone crusher for fine crushing. The ore discharged from the cone crusher and the jaw crusher enter the screening machine at the same time for screening. Such a two-stage and one closed-circuit crushing and screening process can not only improve the heap leaching efficiency of gold mines, but also separate the gold ore concentrate and gangue minerals as much as possible, thereby increasing the recovery rate of gold mines.

Step 2: Pile-building process for gold extraction through heap leaching

Pile-building is one of the important factors affecting the heap leaching efficiency of gold mines. When building piles, belt conveyors and bulldozers are used to avoid ore segregation as much as possible. In addition, when selecting a gold mine heap leaching site, it is more cost-effective to choose ravine areas or rough slope areas. The height of the pile is a factor that affects drug permeability. Therefore, when building piles, the height should not exceed 5m. It should be noted that in order to avoid the loss of precious liquid, a leak-proof floor mat should be laid at the bottom.

Step 3: Dosing and spraying process for heap leaching gold

In order to enable the ore pile to receive drugs evenly, the pipes of the spray device should Set on top of the pile. When carrying out spraying operations, intermittent spraying can be used. The spray liquid can be composed of cyanide (such as sodium cyanide), alkaline solution (sodium hydroxide), lime water, etc. These drugs are added to the chemical mixing tank and stirred evenly before spraying. After a period of spraying, your liquid flows into your liquid pool for further processing.

Step 4: Heap leaching noble liquor for gold extraction - activated carbon adsorption process

The percolated noble liquor from the gold mine is pumped into the precious liquor via the noble liquor pump The adsorption column performs activated carbon adsorption. After the adsorption is completed, the gold-loaded carbon enters the carbon storage tank to await the next desorption operation. The remaining adsorbed products flow into the lean liquid pool, and then are pumped to the pile through the lean liquid pump for spraying again. This circulation system can improve the recovery rate of gold concentrate.

Step 5: Gold-loaded carbon desorption and electrolysis process for gold extraction in heap leaching

Gold-loaded carbonDesorption electrolysisThe process is to send the gold-loaded carbon in the carbon storage tank into the desorption column for desorption. The desorption product is filtered by the filter and flows into the electrolytic tank for electrolysis treatment. The gold mud obtained by electrolysis can be used for smelting process . The noble liquid part of the electrolysis and the analysis overflow part are sent to the desorption liquid tank for desorption, and then enter the circulation system. In addition, the underflow part of the desorption is washed in the pickling tank and then returned to the carbon storage tank for removal of the adsorption column.

The above is an introduction to the conventional heap leaching gold extraction process. In the heap leaching gold extraction process, there are many factors that affect its efficiency, such as the particle size of the ore, heaping effect, ph value, oxygen, spray intensity and cyanide concentration. Therefore, when designing the gold mine heap leaching process, many aspects must be considered. Only in this way can the gold ore leaching rate be high and the leaching speed be fast.

Xinhai Mining has served large, medium and small gold ore concentrators, has rich experience in gold mine heap leaching process design, and can provide high-quality and efficient Gold ore beneficiation equipment, welcome to consult.