When cyanide leaching, the concentration of slurry and the content of slime will directly affect the diffusion rate of cyanide and oxygen, the contact of gold particles with the solution, and hinder the relative flow between the gold particles and the solution, thereby reducing the gold Leaching effect.
The viscosity of the pulp is determined by the content of highly dispersed mineral particles in the slurry. The size of these particles is close to that of the colloid. The primary and secondary slimes enter the slurry. They form a very difficult sediment in the slurry to make the viscosity of the slurry. Increase, thereby reducing the dissolution rate of gold and adsorbing dissolved gold.
When the concentration of the slurry is low, the viscosity of the slurry, the diffusion rate of cyanide ions and oxygen in the cyanide solution to the surface of the gold particles is large, thereby increasing the dissolution rate and the leaching rate of gold. However, if the concentration is low, the slurry volume is large, and it is necessary to increase the equipment and increase the dosage. Therefore, low concentration leaching is not suitable.
The optimum slurry concentration is determined by trial and production experience. For less mud, the amount of impurities in the material that can be dissolved by the cyanide solution is less, the concentration of the slurry can reach 40-50%. On the contrary, if the material contains more mud, the ore properties are more complicated, and the pulp concentration should be controlled at 20-30%.

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