The core of the CIL process lies in the efficient monomer dissociation and full exposure of the gold from the ore! This will make the gold facilitate the contact and dissolution of cyanide solution.
The follow picture shows the Vertical Stirred Ball Mill positioned in the gold ore grinding plant.
The Vertical Stirred Ball Mill optimizes this core link through its unique grinding principle. Its excellent grinding efficiency and finer, more uniform grinding products are the guarantee for effective gold leaching. It adopts a vertical structure, flexible laminated grinding, and grinding while leaching, continuously grinding and scrubbing the particles in the slurry. The grinding fineness can reach 200 mesh to 1000 mesh, or even finer. This is crucial for gold ores, especially fine-grained disseminated gold ores, because the gold in such ores is often encapsulated in gangue minerals and must be fully ground to achieve dissociation.
The follow picture shows the slurry ( after leaching ) to be thickening and filtration by the thickener and filter press. Then, adopting a Merrill-Crowe Zinc Precipitation Circuit to recover the gold from the pregnant solution.
The slurry produced by the Vertical Stirred Ball Mill has a more uniform and narrower particle size distribution with less over-crushing, thus having better permeability. In subsequent concentration and washing processes (such as thickener and filter processes), the slurry has better sedimentation and filtration performance, higher industrial separation efficiency, and reduces the risk of gold loss with overflow. The internal movement of the Vertical Stirred Ball Mill is gentle, with less impact force between media and between media and liners. The wear rate of steel balls and liners is significantly lower than that of ball mills dominated by impact force. This not only reduces material costs but also reduces the introduction of iron during grinding, which is beneficial to subsequent cyanide leaching and shortens the leaching time.
Due to the full exposure of gold particles and excellent slurry performance, the kinetics of cyanidation reaction is accelerated, which can shorten the time required to reach the same leaching rate, or process more ores without increasing the number of leaching tanks, reducing sodium cyanide consumption. Reducing the introduction of iron and the slime phenomenon caused by over-crushing lowers the invalid cyanide consumption.
The impact of the Vertical Stirred Ball Mill on the CIL process of gold ores is a significant and revolutionary improvement. By providing slurry with sufficient ultra-fine dissociation and good fluidity, it fundamentally optimizes the conditions for cyanide leaching. Especially when processing fine-grained disseminated and low-grade refractory gold ores, the adoption of the Vertical Stirred Ball Mill and optimized process flow has become a key choice to improve the technical and economic indicators of the CIL plant process!
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