Abstract:The gold grade of a gold ore was 3.20g/t, which was the main recycled element, and the associated antimony could be used as the object of comprehensive recovery.The gold in the raw ore was mainly wrapped by sulfide, accounting for 80.51%, followed by oxide, accounting for 11.58%, while monomer gold and associated gold were less, accounting for only 4.24%.According to the properties of the ore and on the basis of the original technological process and pharmaceutical system,flotation tests were carried out and the optimum process parameters that grinding fineness -0.074mm accounted for 84.6%, the amount of sodium carbonate was 2000g/t, the amount of copper sulfate was 200g/t, the amount of lead nitrate was 150g/t, the amount of butyl xanthate was 150g/t were obtained. When the grinding fineness was -74 μm84.6% and the best pharmaceutical system was adopted, after the flotation process of one roughing, three cleaning and two scavenging, middling returning to closed circuit in sequence, the gold concentrate with recovery ratio of 90.91% and grade of 46.14g/t was obtained,while the grade of tailings was 0.29%.The process mineralogy of tailings shows that the lost gold from tailings was mainly silicate wrapped gold, monomer or intergrowth gold, especially the wrapped by silicate could not be recovered.The possibility of recovery of +0.044mm gold accounting for 30.90% in tailings by gravity separation process can be discussed,while -0.025mm gold accounting for 60.07% in tailings was fine fraction,which was difficult to recover by flotation process.