Abstract: A refractory gold ore in Fengcheng area of Dandong has high carbon，high sulfur and easy slime，which leads to low recovery rate. Through systematic analysis of ore properties，the technical transfor⁃ mation practice was carried out focusing on grinding classification，flotation process and reagent system. The results show that by optimizing the structural parameters of the hydrocyclone and adjusting the ball filling rate and ratio of the ball mill，the processing capacity and product fineness of the primary mill are signifi⁃ cantly improved. The introduction of preferential carbon removal process and“butyl xanthate + SK-9011” combined collector，and the implementation of the regrinding and reconcentration process of the middle ore effectively improved the monomer dissociation degree and flotation selectivity of gold. After the transforma⁃ tion，the gold recovery rate increased from 82.47% to 88.15%，and the high-efficiency separation and tech⁃ nical indicators of refractory gold ore were significantly improved.

Key words: refractory gold ore, flotation, decarbonization process, production transformation