Stirring cyanide operation method
The method of stirring cyanide is divided into two types: continuous stirring cyanidation and intermittent stirring cyanidation. Under normal circumstances, the continuous gold cyanide process is used in the gold-removing factories. Only the small-scale planting or processing of insoluble gold ore is used for the staged mixing cyanide, and when each leaching requires the use of a new cyanide solution. The cyanidation method was carried out by intermittent stirring. The mixing cyanidation process includes ore furnishing, adding water to stir slurry, adding reagents, controlling cyanide time, and decanting to remove tailings.
First, intermittent stirring cyanide
The intermittently stirred cyanide industry is generally suitable for small mines that process ore around 10 tons per day. For large mines, it is usually done by several or even a dozen slots in parallel to increase processing capacity. The leached pulp is stored in a storage tank and filtered and washed in batches. Then add another batch of raw material to leach. In order not to cause the slurry stored in the sump to settle, it must be continuously stirred by mechanical or air.
The slurry used for stirring cyanidation usually contains 50% solids. When intermittently cyanating and washing the slurry in the same leaching tank, it is necessary to add the washing liquid after leaching to dilute the slurry to 25% solids and then wash, so the leaching tank The actual capacity should be the sum of the volume of ore sand, cyanide solution and washing liquid, and add ample capacity above the liquid level in the tank to avoid loss caused by slurry overflow.
Second, continuous stirring cyanide
The continuous stirring cyanide operation is usually carried out continuously in 3 to 6 leaching tanks in series, which facilitates the automation of the operation process. After the slurry enters the first leaching tank and undergoes cyanidation treatment, it then flows into the second tank and the third tank in sequence. The cyanidation treatment is continued until the final leaching tank is completed and the cyanidation treatment is completed, and the slurry overflows. Send filtration and washing. Since the continuous leaching operation is continuously carried out in several tanks connected in series, the charging and unloading time is saved, and the production capacity of the equipment is also improved; and the cyanide slurry is continuously sent for filtration, and the storage tank is not required before filtration. , thereby reducing the plant area and the power consumption for mixing the slurry in the storage tank.
In order to smoothly flow the slurry from the first tank into the subsequent tanks in succession, the leaching tank should be installed in a stepped manner, and the pumping should be carried out without pumping. Under normal operating conditions, the supply and discharge of pulp in any one of the stirred tanks in series should be balanced. In any case, it is necessary to ensure that the slurry passes through the tanks smoothly, and does not affect the normal operation due to the blockage of the ore sand.
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