Concept and adaptability of diafiltration cyanidation

The diafiltration cyanidation method is a method in which gold in the ore is leached by permeating a cyanide solution through a sand layer installed in a leaching tank equipped with a filter bottom.

The diafiltration cyanidation process is suitable for the treatment of ore, loose and porous materials and slag. This method can handle -10 mm Material. This method is most suitable for the ore containing clay , slime and finely ground materials. Therefore, before using the percolation method to treat such ore, the mud in the ore must be separated because these fine mud layers can make the leachate However, the rate of de-filtration or percolation is very slow, and they are suitable for leaching gold in the state of pulp.

Compared to the stirred cyanidation process, the diafiltration cyanidation process is a simpler and less expensive method of gold extraction. The advantage of this method is that the leaching agent consumes less, consumes less power, and has less capital investment. Its disadvantage is the long operating time, equipment and facilities large area, is not completely washed, lower gold extraction rate, typically 60 to 80%.

When the ore is treated by diafiltration cyanidation, the extraction rate of gold depends on the size of the gold particles, the size of the ore, the percolation rate, the working time, the cyanide concentration, the degree of tailings cleaning, and the cyanidation properties of the ore. Gold-bearing quartz ore processing method by diafiltration, gold extraction rate 85 ~ 90%, but not fine ore crushing or fractional insufficient, the gold extraction may decrease to 60%.

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