Among them, the solvent extraction method has the following characteristics: 1 fast reaction speed; 2 sensitive to suspended solids content; 3 good selectivity; 4 loss of organic matter, etc.
Direct electrolysis has the following characteristics: 1 fast reaction rate; 2 sensitive to suspended solids content; 3 good selectivity; 4 low processing capacity.
3. Factors affecting heap leaching
1) Influence of concentration of clotant The high concentration of cyanide (usually sodium cyanide) in the solution can accelerate the leaching speed and shorten the leaching time. The leaching time required to use 0.1% sodium cyanide solution is 0.025% cyanidation. The leaching time of the sodium solution is 1/4, and the relationship curve is shown in Fig. 7.

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2) Influence of pH of leachate Lime or sodium hydroxide is commonly used in the heap leaching process to control the pH of the ore solution in the range of 11-12.
3) Effect of oxygen concentration in the leachate In the dissolution process of gold , when the cyanide concentration is sufficiently high, the dissolution rate depends on the concentration of oxygen. In heap leaching, the aeration of the heap should be kept well and the circulation of the leachate should be strengthened to ensure that sufficient oxygen is involved in the reaction.
4) Influence of impurities The impurities that affect the effect of the heap leaching method are: 1 impurities that consume oxygen, such as iron sulfide; 2 impurities that consume cyanide, such as Cu, Zn, Pb, S, etc.; 3 effects of xanthate.
5) Effect of sprinkling the leaching of gold increases sprinkling agents can improve the leaching rate of gold, but the increased amount of leaching of impurities in the ore sprinkling will increase and decrease the relative concentration of the impurity concentration in the total gold extraction liquid ratio. The effect of spray intensity on leaching rate is shown in Figure 8.

6) Influence of ore particle size From the viewpoint of kinetics, under the same conditions, the smaller the particle size of the ore, the faster the gold leaching speed. But will affect the particle size is too fine ore heap leaching liquid permeation speed of the ore, the heap is not conducive to liquid-solid separation ore, fine ore impede serious heap leaching liquid heap leaching affect uniform flow efficiency through the additional ore fines more is not conducive to the heap cleaning, which caused a washing time is too long, but also because it contains too many surplus was caused by the loss of gold.
7) Influence of ore surface state and gold occurrence state Gold is easy to leaching in the crack of ore, and it is difficult to be leached when gold is wrapped.

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