Iron sulfide ore (pyrite and pyrrhotite) is the main raw material Sulfuric Acid. Gold that is symbiotic with pyrite is not suitable for direct gold extraction by cyanidation. Usually, the pyrite sulfide concentrate obtained by flotation is first calcined and desulfurized at 700-850 ° C, and the produced SO 2 -containing flue gas is used for preparing sulfuric acid, and the calcined residue is used for lifting. gold. The main component of the slag is hematite and some magnetite. Generally, the slag contains 0.5~3g/t of gold. However, the particle size of the gold in the slag is very small, and the disaster is less than 0.01 mm, and most of them are packaged gold. It is difficult to achieve monomer separation of gold by a single grinding method. Only by calcination, water quenching and then grinding, can most of the gold be extracted by cyanidation. The process of recovering gold from pyrite cinder in the industry is shown in the figure below. The cyanide leaching rate of gold is 77%, the washing rate is 98%, the zinc substitution rate is 99.8%, and the total gold recovery rate is 71.6%. The obtained gold cyanide gold grade has a gold content of about 0.4%, and can be used as a raw material for one-step refined gold.
Figure Recovery process from pyrite cinder
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