Abstract:

Fine-disseminated type gold deposits are often rich in arsenic，mercury，antimony，carbon and other minerals difficult to deal with，fine grained gold is commonly used in sulfide minerals such as pyrite，belong to refractory ore.Gold mineral particle size is very small in a gold deposit in Shaanxi Province，mainly for sub-micro gold.It is difficult to obtain high grade gold concentrate by traditional flotation method，for the effective extraction of fine grained gold ore，technological mineralogy and mineral processing tests were carried out.Process mineralogy research shows the main gold bearing minerals are pyrite.Under the condition of -0.074 mm accounting for 60% of the fineness，the dissociation degree of pyrite was 93.48%.The form of natural gold is sub-micro gold and lattice gold，belonging to fine grain disseminated type refractory ore.Comprehensive comparison of mineral processing test shows that the gold mine is suitable for the process of “grinding-roasting-grinding-cyanide”，and under the condition of the ore grinding to -0.075 mm accounted for 80%，and then roast 2 h at 650 ℃，the calcined ore grinding to -0.075 mm accounted for 95%，NaCN dosage of 4 kg/t and cyanide time of 36 h， the gold leaching rate can reach 73.36%.The test scheme is suitable for the flotation of fine disseminated gold ores，mineral processing effect is more ideal.

Key words: micrograined-disseminated gold ore, refractory ore, cyanide leaching, mineral processing experiment