Electrochemical leaching solution, arsenic acid ions was 6 ~ As 7 grams / Liter of sulfate ion was 5 ~ 5 13 grams / L and silicate anions and aluminum have a few mg / liter. The remaining concentration of caustic soda is 55~ 75 grams / L. After treating the solution with lime, arsenic is discharged from the solution in the form of a low-dissolved calcium arsenate and concentrated in caustic soda. 150 grams / Liter and cool to 16~ 17 °C At the same time, the sulfur is discharged as anhydrous sodium sulfate. By purifying this, the arsenic content in the solution can be reduced to 0.7 g / L, sulfur drops to 6.5 grams / L, which creates conditions for the recycling of the solution. After lime treatment solution, caustic soda for leaching arsenic pyrite 60% regenerated. However, the caustic soda used to leach pyrite is not actually regenerated. It remains in solution as sodium sulphate.

As seen from the data in Table 2 , when the concentrate I is treated according to the process flow specified in the following figure , the recovery rate of gold is the same level as that of the treatment according to the torrefaction process, and for concentrate II and concentrate III, The gold lost with the cyanide tailings is lower than the calcination process. Dropped by 3/4 .

Expanding the cost of processing the concentrate in the electrochemical leaching process The technical and economic calculations show that the various costs depend on the material composition of the concentrate. The content of pyrite in the concentrate is greatly affected. For low-sulfide concentrates, the electrochemical leaching process is economically superior to the roasting process, while for concentrates containing about 15% pyrite , the cost of electrochemical leaching is roughly equivalent to the cost of roasting.

The cost of processing concentrate II is about 66.1 rubles per ton, while that of concentrate III is 53.3 rubles per ton. The cost of processing the gold - arsenic concentrate in accordance with the roasting - baking cyanidation process is 61.4 rubles / ton.

For the treatment of concentrates with high pyrite content (concentrate 1 ), electrochemical leaching is economically uneconomical. However, for some products containing dipyrite and pyrite, the electrochemical leaching process is economically feasible.

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For the refractory gold - arsenic concentrates with different arsenic pyrite and pyrite content , electrochemical leaching is effective. After electrochemical leaching of the concentrate, 72-87% of arsenic pyrite and 45~53% of pyrite can be decomposed, so that the tailings gold content after cyanidation of the residue can be compared with the tail treated by the roasting process. The mine has decreased or is roughly equivalent.

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