Gold ore pre-granulation cyanide heap leaching has been quite widespread, especially in high-grade gold ore crushing majority to a very fine degree, granulated heap leaching. In the South American No. 1 Gold Mine, the ore is finely crushed to -0.6 mm and then granulated. When granulating, the sodium cyanide solution is used instead of water. The water content of the pellet is 16%, the leaching period is 5-6 days, and the leaching rate is 90%. The drying-pre-cyanide-granulation heap leaching used in the Zimuyu gold mine in Guizhou, China is a successful example. Lei Ting et al. compared the occurrence of gold in the ore, the size of the particle size of -95% or more is monomeric gold, and is basically characterized by fine-grained gold. The pre-cyanide-fabrication was compared in detail in the laboratory. Grain heap leaching and conventional granulation heap leaching results. Under the premise of strictly controlling and guaranteeing the ore composition, spray conditions and granulation parameters (except for using 0.14% sodium cyanide solution instead of water), a comparative leaching test was carried out, and the results shown in Fig. 1 were obtained.
Figure 1 Pre-cyanide-granulation column leaching test results
It can be seen from Fig. 1 that the effect of pre-cyanide-granulation heap leaching on shortening the leaching cycle is obvious. Under the same leaching rate, the leaching time of the pre-cyanide-granulation heap leaching is only after water granulation. 1/3 of the time of spraying with sodium cyanide solution.
For natural gold with a coarse particle size, such as greater than 0.1 mm, the leaching effect of pre-cyanide is not obvious; when the content of cyanide-containing impurities (such as copper , zinc, etc.) in the ore is high, it is not suitable to use pre-cyanide. method.
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