Abstract: The Isoamyl Xanthate and Butylamine Dithiophosphate are used together as collector in a Gold Beneficiation Plant of Shandong. And a flotation process of one roughing -two cleaning-two scavenging for gold ore with grinding of -0.074 mm 60% is adopted, only obtaining a gold recovery of about 59%. Thus, researches mainly focusing on the reagent condition tests and the grinding fineness tests were carried out. The tests results indicated that the gold concentrate with Fe grade of 30.83 g/t and Fe recovery of 93.36% was obtained by a closed-circuit flotation of one roughing-one cleaning-one scavenging with conditions of BD-11 as collectors, Copper Sulfate as an activator, 11# oil as the foaming agent, and the grinding fineness of -0.074 mm 60%. By this method, the gold recovery can be rapidly improved, compared with the on-site production.  

Key words: Gold ore, Flotation, BD-11collector, Gold recovery rate