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Extracting Gold from Low-Grade Gold Ore

     

The specific steps are as follows:

a. Gold ore pretreatment: Remove impurities such as clay and silt from the surface of the mined gold ore, then crush and screen the ore. Select ore fractions with a particle size of less than 70 mm, mix them with slaked lime at a specified proportion, and stir thoroughly to obtain a mixture, which is then piled up to form an ore heap.

b. Preparation of infiltration agent: Adjust the pH of the solvent to 10-12 to obtain an alkaline solution, and add sodium cyanide to prepare the infiltration agent.

c. Spraying: Spray the infiltration agent onto the ore heap continuously to collect the pregnant solution (gold-bearing leachate).

d. Collection of gold-loaded carbon: Pump the pregnant solution into an adsorption column packed with activated carbon. The gold-bearing complexes in the pregnant solution are adsorbed by the activated carbon, yielding gold-loaded carbon and barren solution with low gold content. The barren solution is recycled and treated before being reused in steps b, c and d.

e. Extraction of elemental gold: The gold-loaded carbon obtained in step d is processed to extract elemental gold.

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