某含碳微细粒金矿金含量为5.56×10^-6，大部分金呈微细粒包裹于含碳硅质板岩碎屑中，有机碳和石墨含量分别为1.33%和1.50%，是典型的含碳难处理金矿。为实现该含碳难处理金矿的浮选预富集，进行了先浮选碳质后浮选金和直接浮选金等不同工艺流程的探讨试验，并在最佳流程基础上进行了直接浮选工艺的条件优化试验。结果表明：采用直接浮选工艺可以获得品位较高的金精矿，当磨矿细度为-0.074 mm含量占比为85%时，可获得金品位为30.01×10^-6，回收率为76.18%的金精矿，金回收率较先浮选碳质后浮选金工艺明显提高；调整工艺流程结构，采用一段粗磨浮选—扫选精矿再磨浮选工艺，可获得金品位为33.45×10^-6、金回收率为79.93%的金精矿。该流程选矿指标相较于一次磨矿细度为-0.074 mm含量占比为85%的指标更优，是适宜含碳微细粒难处理金矿石的处理流程。

Carbon-bearing gold ores account for more than 20% of the total gold deposits in China，so the treatment technology of carbon-bearing gold ores has been widely concerned.The flotation of carbon-bearing gold deposits mainly adopts the two following technologies，one is to remove carbon first then float the gold-bearing minerals，the other is to float carbon and gold-bearing minerals together.In the process of carbon removal，some gold is often lost in the carbon ore，resulting in a low total gold recovery.Therefore，it is of great significance to carry out the research on the direct flotation technology of carbon-bearing gold ores.The content of a carbon-containing fine-grained gold is 5.56×10^-6.The gold mainly exists as naked or half naked and silicate package gold，and the grain size of the gold inlay is uneven.Natural gold is closely related to fine-grained cryptocrystalline quartz and carbon，and most of them are wrapped in carbon-containing siliceous slate clastics as fine particles.The harmful element carbon in the ore is relatively high，the organic carbon and graphite content is 1.33% and 1.50% respectively，which is a typical carbon-containing refractory gold mine.In order to realize the pre-enrichment of this refractory carbon-bearing gold ore by flotation，different technological processes such as carbon flotation followed by flotation gold and direct flotation gold were investigated and the conditions of direct flotation were optimized.The results show that higher grade gold concentrate can be obtained by direct flotation.According to the condition optimization test，the gold concentrate with a gold grade of 30.01×10^-6 and a recovery rate of 76.18% can be obtained when the grinding fineness is -0.074 mm ac-counting for 85%.Its gold concentrate grade and recovery are both higher than the condition of grinding fineness is -0.074 mm accounted for 75%.The results also prove that the reason why the gold containing carbon is difficult to be treated is that the carbon and gold are closely related and belong to fine grain.By adjusting the structure of the technological process，the gold concentrate with 33.45×10^-6 gold grade and recovery of 79.93% can be obtained by adopting a coarse grinding flotation-sweep concentrate and then grinding flotation.Compared with the index of one-time grinding process with ginding fineness of -0.074 mm accounting for 85%，this pro-cess is better，and the reduction of grinding energy consumption is reduced，making it an appropriate treatment process for this ore.