Abstract: In order to cope with the influence of the change of ore properties on the production index of mineral processing，a copper concentrator in Anhui Province has carried out the investigation of the original process flow，experimental analysis and optimization of the reagent system in view of the problems of low copper recovery rate and unstable concentrate grade.The study added a copper cleaning process，applied ac‐ tivated carbon to reduce the viscosity of flotation foam，adjusted the grinding medium feeding system，and optimized the separation particle size composition.The industrial practice shows that after the transforma‐ tion，the grade of copper concentrate is increased from 15.24% to 18.71%，the recovery rate is increased from 59.94% to 65.19%，and the annual economic benefit is increased by 4 million yuan. It provides experi‐ ence for the technical transformation of similar mines and has demonstration significance for the efficient uti‐ lization of mineral resources.

Key words: ore properties, recovery rate, concentrate grade, economic benefit