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Heap Leaching Process for Low-Grade Gold Ore

     

This process falls under the technical field of metallurgy, and is implemented in accordance with the following steps:

① Raw gold ore is first processed by open-circuit coarse crushing. All coarsely crushed products are fed into the intermediate crushing system and then classified by a vibrating screen. Coarse oversize materials are returned to the intermediate crushing equipment for further crushing, while qualified undersize materials meeting the particle size requirement are fed into the HPGR mill.

② After open-circuit fine crushing by the HPGR, the crushed products are treated through the combined action of a wet vibrating screen and classification equipment. The finer overflow products are delivered to the all-slime cyanidation leaching system, while the underflow sand and coarse-grained materials are mixed with an appropriate amount of pH-adjusting lime, then transported to the leaching yard for heap construction, so as to realize the classified leaching process for gold ore materials.

③ After the leaching process is completed, gold-bearing pregnant solution and tailings are obtained.

This process adopts HPGR open-circuit fine crushing. The crushed products feature finer particle size and abundant surface microcracks, which can significantly improve the gold leaching rate, reduce the consumption of leaching reagents, and shorten the heap leaching cycle. Meanwhile, the classified fine-grained products can be recovered synchronously during the heap leaching process.

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