Abstract:A low grade gold deposit in Shanyang county contains 1.35g/t gold, which mainly exists in the state of bare or semi-bare gold. Based on the mineral properties and environmental protection requirements, this test is based on Nelson centrifugal concentrator to carry out the conditional experiments of grinding fineness, flushing water flow, gravity G value and feeding concentration condition test, so as to determine the best process parameters of Nelson gravity separation. Finally, in the closed-circuit test of "one Nelson rough selection- one Nelson scavenging selection- one chute scavenging selection- two shaker selection ", the high grade gold concentrate with gold grade of 1086g/t, gold recovery of 51.92%, silver grade of 6912g/t, silver recovery of 47.30% and low grade gold concentrate with gold grade of 16.42/t, gold recovery of 31.73%, silver grade of 100g/t, silver recovery of 27.51% were obtained. The total recovery of gold and silver was 83.65% and 74.81%, respectively.