Heap leaching: several technical points-1

Granulating
Lime dosage must reach the PH value between 9.5 ~ 10.5, after testing to determine, to reach certain alkalinity, can beaker plus 1000 grams of ore + lime 2 grams, 4 grams, 6 grams + water into aggregates, and then just dip to the surface of the mine, 24 hours after testing PH value is 9.5 ~ 10.5. According to the aggregate made of cement in water 24 hours after not loose mud, determine the amount. Dosage of sodium cyanide, humidity, and moisture content over 10%, mostly due to the ore itself and ore containing impurities, so the granulating sodium cyanide concentration increases, in the mine around 60 ~ 150 g per ton, with the sodium cyanide concentration between 0.1% ~ 0.5%, the conversion can be appropriate with the amount of sodium cyanide and concentration, to determine the concentration of sodium cyanide pellet, The PH is around 11.5. Granule moisture 15% ~ 20%, coupled with the mineral itself moisture content of about 10%, the total moisture is generally not more than 30%, otherwise, the granule is easy to loose, easy to soft, curing time in more than 72 hours, if it rains when granulation, that is, to cover the ore, so as not to lose gold or the use of side building heap side spray, because after granulation gold leaching. Stacking
By rolling back and forth on the ore heap, the ore particles are compacted and crushed.As soon as the weather gets hot, it will be pressed into a big cake. It is best to stack it using the conveyor belt if conditions permit. The height of the ore heap is not too high at present, it is appropriate to be 3 to 4 meters, and the leaching rate will increase steadily in the future.