关键词: 金矿石, 重选—浮选联合流程, 选矿试验, 尼尔森重选

Abstract: The gold grade of an altered rock type gold ore in northern Laos is 4.51 g/t，64.11% of the gold exists in the form of bare-semi-exposed gold，and the rest exists in the form of wrapped gold. Based on the process mineralogical properties，single gravity separation，single flotation，single cyanidation， gravity separation-flotation，gravity separation-cyanidation and other processes were conducted. The re⁃ sults show that the technical indexes obtained by the gravity separation-flotation combined process are the best. A gravity separation gold concentrate with gold grade of 134.00 g/t and recovery of 49.92% and a flota⁃ tion gold concentrate with gold grade of 48.72 g/t and recovery of 43.90% were obtained by adopting the combined process of shaking table gravity separation-one roughing-two cleaning-two scavenging flotation. The combined process realizes the enrichment and recovery of gold，which provides a technical basis for the efficient utilization of ore.

Key words: gold ore, gravity separation-flotation combined process, beneficiation test, Nielsen gravity separation